Vulnerabilities > CVE-2016-9383 - Improper Input Validation vulnerability in multiple products

047910
CVSS 8.8 - HIGH
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
local
low complexity
xen
citrix
CWE-20
nessus
NVD
Published: 2017-01-23
Updated: 2017-07-01

Summary

Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.

Vulnerable Configurations

Part Description Count
OS
Xen
1
Application
Citrix
4

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Nessus

  • NASL familyOracleVM Local Security Checks
    NASL idORACLEVM_OVMSA-2016-0164.NASL
    descriptionThe remote OracleVM system is missing necessary patches to address critical security updates : - BUILDINFO: commit=5e4dc2c5fbd14b065234c0b5e5b637e0e005fab7 - pygrub: Properly quote results, when returning them to the caller: (Ian Jackson) [Orabug: 25094263] (CVE-2016-9379) (CVE-2016-9380) - x86emul: fix huge bit offset handling (Jan Beulich) [Orabug: 25088366] (CVE-2016-9383) - x86/PV: writes of %fs and %gs base MSRs require canonical addresses (Jan Beulich) [Orabug: 25087576] (CVE-2016-9385) - x86/HVM: don
    last seen2020-06-01
    modified2020-06-02
    plugin id95278
    published2016-11-23
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95278
    titleOracleVM 3.4 : xen (OVMSA-2016-0164)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from OracleVM
# Security Advisory OVMSA-2016-0164.
#

include("compat.inc");

if (description)
{
  script_id(95278);
  script_version("3.16");
  script_cvs_date("Date: 2019/09/27 13:00:35");

  script_cve_id("CVE-2016-7777", "CVE-2016-9379", "CVE-2016-9380", "CVE-2016-9382", "CVE-2016-9383", "CVE-2016-9385", "CVE-2016-9386");

  script_name(english:"OracleVM 3.4 : xen (OVMSA-2016-0164)");
  script_summary(english:"Checks the RPM output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote OracleVM host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote OracleVM system is missing necessary patches to address
critical security updates :

  - BUILDINFO:
    commit=5e4dc2c5fbd14b065234c0b5e5b637e0e005fab7

  - pygrub: Properly quote results, when returning them to
    the caller: (Ian Jackson) [Orabug: 25094263]
    (CVE-2016-9379) (CVE-2016-9380)

  - x86emul: fix huge bit offset handling (Jan Beulich)
    [Orabug: 25088366] (CVE-2016-9383)

  - x86/PV: writes of %fs and %gs base MSRs require
    canonical addresses (Jan Beulich) [Orabug: 25087576]
    (CVE-2016-9385)

  - x86/HVM: don't load LDTR with VM86 mode attrs during
    task switch (Jan Beulich) [Orabug: 25087539]
    (CVE-2016-9382)

  - x86/hvm: Fix the handling of non-present segments
    (Andrew Cooper) [Orabug: 25087515] (CVE-2016-9386)

  - BUILDINFO:
    commit=286bb9711e33d92767e8608bea4d3da6dbeeb710

  - move TLB-flush filtering out into populate_physmap
    during vm creation (Dongli Zhang) [Orabug: 24951888]

  - replace tlbflush check and operation with inline
    functions (Dongli Zhang) [Orabug: 24951888]

  - x86/hvm: extend HVM cpuid leaf with vcpu id (Paul
    Durrant) - x86/hvm: add HVM-specific hypervisor CPUID
    leaf (Boris Ostrovsky) - xend: soft_reset support.
    (Konrad Rzeszutek Wilk) - (lib)xl: soft reset support
    (Vitaly Kuznetsov) - tools/libxl: Save and restore
    EMULATOR_XENSTORE_DATA content (Andrew Cooper) - libxl:
    introduce libxl__device_model_xs_path (Wei Liu) - libxl:
    add LIBXL_DEVICE_MODEL_SAVE_FILE (Vitaly Kuznetsov) -
    libxc: support XEN_DOMCTL_soft_reset operation (Vitaly
    Kuznetsov) - arch-specific hooks for domain_soft_reset
    (Vitaly Kuznetsov) - flask: DOMCTL_soft_reset support
    (Vitaly Kuznetsov) - introduce XEN_DOMCTL_soft_reset
    (Vitaly Kuznetsov) - evtchn: make evtchn_reset ready for
    soft reset (Vitaly Kuznetsov) - evtchn: make
    EVTCHNOP_reset suitable for kexec (Vitaly Kuznetsov) -
    xl: introduce enum domain_restart_type (Vitaly
    Kuznetsov) - libxl: support SHUTDOWN_soft_reset shutdown
    reason (Vitaly Kuznetsov) - introduce
    SHUTDOWN_soft_reset shutdown reason (Vitaly Kuznetsov) -
    x86emul: honor guest CR0.TS and CR0.EM (Jan Beulich)
    [Orabug: 24697001] (CVE-2016-7777)"
  );
  # https://oss.oracle.com/pipermail/oraclevm-errata/2016-November/000589.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?07deecef"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected xen / xen-tools packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:vm_server:3.4");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/10/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/11/23");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"OracleVM Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleVM/release", "Host/OracleVM/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/OracleVM/release");
if (isnull(release) || "OVS" >!< release) audit(AUDIT_OS_NOT, "OracleVM");
if (! preg(pattern:"^OVS" + "3\.4" + "(\.[0-9]|$)", string:release)) audit(AUDIT_OS_NOT, "OracleVM 3.4", "OracleVM " + release);
if (!get_kb_item("Host/OracleVM/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "OracleVM", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_exists(rpm:"xen-4.4.4-105", release:"OVS3.4") && rpm_check(release:"OVS3.4", reference:"xen-4.4.4-105.0.2.el6")) flag++;
if (rpm_exists(rpm:"xen-tools-4.4.4-105", release:"OVS3.4") && rpm_check(release:"OVS3.4", reference:"xen-tools-4.4.4-105.0.2.el6")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xen / xen-tools");
}
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-720.NASL
    descriptionMultiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems : CVE-2016-9379, CVE-2016-9380 (XSA-198) pygrub, the boot loader emulator, fails to quote (or sanity check) its results when reporting them to its caller. A malicious guest administrator can obtain the contents of sensitive host files CVE-2016-9381 (XSA-197) The compiler can emit optimizations in qemu which can lead to double fetch vulnerabilities. Malicious administrators can exploit this vulnerability to take over the qemu process, elevating its privilege to that of the qemu process. CVE-2016-9382 (XSA-192) LDTR, just like TR, is purely a protected mode facility. Hence even when switching to a VM86 mode task, LDTR loading needs to follow protected mode semantics. A malicious unprivileged guest process can crash or escalate its privilege to that of the guest operating system. CVE-2016-9383 (XSA-195) When Xen needs to emulate some instruction, to efficiently handle the emulation, the memory address and register operand are recalculated internally to Xen. In this process, the high bits of an intermediate expression were discarded, leading to both the memory location and the register operand being wrong. A malicious guest can modify arbitrary memory. CVE-2016-9386 (XSA-191) The Xen x86 emulator erroneously failed to consider the unusability of segments when performing memory accesses. An unprivileged guest user program may be able to elevate its privilege to that of the guest operating system. For Debian 7
    last seen2020-03-17
    modified2016-11-25
    plugin id95296
    published2016-11-25
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95296
    titleDebian DLA-720-1 : xen security update
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-720-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(95296);
  script_version("3.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/10");

  script_cve_id("CVE-2016-9379", "CVE-2016-9380", "CVE-2016-9381", "CVE-2016-9382", "CVE-2016-9383", "CVE-2016-9386");
  script_xref(name:"IAVB", value:"2016-B-0177-S");

  script_name(english:"Debian DLA-720-1 : xen security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Multiple vulnerabilities have been discovered in the Xen hypervisor.
The Common Vulnerabilities and Exposures project identifies the
following problems :

CVE-2016-9379, CVE-2016-9380 (XSA-198)

pygrub, the boot loader emulator, fails to quote (or sanity check) its
results when reporting them to its caller. A malicious guest
administrator can obtain the contents of sensitive host files

CVE-2016-9381 (XSA-197)

The compiler can emit optimizations in qemu which can lead to double
fetch vulnerabilities. Malicious administrators can exploit this
vulnerability to take over the qemu process, elevating its privilege
to that of the qemu process. 

CVE-2016-9382 (XSA-192)

LDTR, just like TR, is purely a protected mode facility. Hence even
when switching to a VM86 mode task, LDTR loading needs to follow
protected mode semantics. A malicious unprivileged guest process can
crash or escalate its privilege to that of the guest operating system.

CVE-2016-9383 (XSA-195)

When Xen needs to emulate some instruction, to efficiently handle the
emulation, the memory address and register operand are recalculated
internally to Xen. In this process, the high bits of an intermediate
expression were discarded, leading to both the memory location and the
register operand being wrong. A malicious guest can modify arbitrary
memory.

CVE-2016-9386 (XSA-191)

The Xen x86 emulator erroneously failed to consider the unusability of
segments when performing memory accesses. An unprivileged guest user
program may be able to elevate its privilege to that of the guest
operating system.

For Debian 7 'Wheezy', these problems have been fixed in version
4.1.6.lts1-4. For Debian 8 'Jessie', these problems will be fixed
shortly.

We recommend that you upgrade your xen packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2016/11/msg00026.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/xen"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-4.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-ocaml");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-ocaml-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenstore3.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-docs-4.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.1-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.1-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-system-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-system-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-4.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xenstore-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/11/25");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"libxen-4.1", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"libxen-dev", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"libxen-ocaml", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"libxen-ocaml-dev", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"libxenstore3.0", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-docs-4.1", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-hypervisor-4.1-amd64", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-hypervisor-4.1-i386", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-system-amd64", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-system-i386", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-utils-4.1", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xen-utils-common", reference:"4.1.6.lts1-4")) flag++;
if (deb_check(release:"7.0", prefix:"xenstore-utils", reference:"4.1.6.lts1-4")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2017-5.NASL
    descriptionThis updates xen to version 4.4.4_06 to fix the following issues : - An unprivileged user in a guest could gain guest could escalate privilege to that of the guest kernel, if it had could invoke the instruction emulator. Only 64-bit x86 HVM guest were affected. Linux guest have not been vulnerable. (boo#1016340, CVE-2016-10013) - An unprivileged user in a 64 bit x86 guest could gain information from the host, crash the host or gain privilege of the host (boo#1009107, CVE-2016-9383) - An unprivileged guest process could (unintentionally or maliciously) obtain or ocorrupt sensitive information of other programs in the same guest. Only x86 HVM guests have been affected. The attacker needs to be able to trigger the Xen instruction emulator. (boo#1000106, CVE-2016-7777) - A guest on x86 systems could read small parts of hypervisor stack data (boo#1012651, CVE-2016-9932) - A malicious guest kernel could hang or crash the host system (boo#1014298, CVE-2016-10024) - A malicious guest administrator could escalate their privilege to that of the host. Only affects x86 HVM guests using qemu older version 1.6.0 or using the qemu-xen-traditional. (boo#1011652, CVE-2016-9637) - An unprivileged guest user could escalate privilege to that of the guest administrator on x86 HVM guests, especially on Intel CPUs (boo#1009100, CVE-2016-9386) - An unprivileged guest user could escalate privilege to that of the guest administrator (on AMD CPUs) or crash the system (on Intel CPUs) on 32-bit x86 HVM guests. Only guest operating systems that allowed a new task to start in VM86 mode were affected. (boo#1009103, CVE-2016-9382) - A malicious guest administrator could crash the host on x86 PV guests only (boo#1009104, CVE-2016-9385) - A malicious guest administrator could get privilege of the host emulator process on x86 HVM guests. (boo#1009109, CVE-2016-9381) - A vulnerability in pygrub allowed a malicious guest administrator to obtain the contents of sensitive host files, or even delete those files (boo#1009111, CVE-2016-9379, CVE-2016-9380) - A privileged guest user could cause an infinite loop in the RTL8139 ethernet emulation to consume CPU cycles on the host, causing a DoS situation (boo#1007157, CVE-2016-8910) - A privileged guest user could cause an infinite loop in the intel-hda sound emulation to consume CPU cycles on the host, causing a DoS situation (boo#1007160, CVE-2016-8909) - A privileged guest user could cause a crash of the emulator process on the host by exploiting a divide by zero vulnerability of the JAZZ RC4030 chipset emulation (boo#1005004 CVE-2016-8667) - A privileged guest user could cause a crash of the emulator process on the host by exploiting a divide by zero issue of the 16550A UART emulation (boo#1005005, CVE-2016-8669) - A privileged guest user could cause an infinite loop in the USB xHCI emulation, causing a DoS situation on the host (boo#1004016, CVE-2016-8576) - A privileged guest user could cause an infinite loop in the ColdFire Fash Ethernet Controller emulation, causing a DoS situation on the host (boo#1003030, CVE-2016-7908) - A privileged guest user could cause an infinite loop in the AMD PC-Net II emulation, causing a DoS situation on the host (boo#1003032, CVE-2016-7909) - Cause a reload of clvm in the block-dmmd script to avoid a blocking lvchange call (boo#1002496) - Also unplug SCSI disks in qemu-xen-traditional for upstream unplug protocol. Before a single SCSI storage devices added to HVM guests could appear multiple times in the guest. (boo#953518) - Fix a kernel panic / black screen when trying to boot a XEN kernel on some UEFI firmwares (boo#1000195)
    last seen2020-06-05
    modified2017-01-03
    plugin id96253
    published2017-01-03
    reporterThis script is Copyright (C) 2017-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/96253
    titleopenSUSE Security Update : xen (openSUSE-2017-5)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2017-5.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(96253);
  script_version("3.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/10");

  script_cve_id("CVE-2016-10013", "CVE-2016-10024", "CVE-2016-7777", "CVE-2016-7908", "CVE-2016-7909", "CVE-2016-8576", "CVE-2016-8667", "CVE-2016-8669", "CVE-2016-8909", "CVE-2016-8910", "CVE-2016-9379", "CVE-2016-9380", "CVE-2016-9381", "CVE-2016-9382", "CVE-2016-9383", "CVE-2016-9385", "CVE-2016-9386", "CVE-2016-9637", "CVE-2016-9932");
  script_xref(name:"IAVB", value:"2016-B-0149-S");
  script_xref(name:"IAVB", value:"2017-B-0008-S");

  script_name(english:"openSUSE Security Update : xen (openSUSE-2017-5)");
  script_summary(english:"Check for the openSUSE-2017-5 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This updates xen to version 4.4.4_06 to fix the following issues :

  - An unprivileged user in a guest could gain guest could
    escalate privilege to that of the guest kernel, if it
    had could invoke the instruction emulator. Only 64-bit
    x86 HVM guest were affected. Linux guest have not been
    vulnerable. (boo#1016340, CVE-2016-10013)

  - An unprivileged user in a 64 bit x86 guest could gain
    information from the host, crash the host or gain
    privilege of the host (boo#1009107, CVE-2016-9383)

  - An unprivileged guest process could (unintentionally or
    maliciously) obtain or ocorrupt sensitive information of
    other programs in the same guest. Only x86 HVM guests
    have been affected. The attacker needs to be able to
    trigger the Xen instruction emulator. (boo#1000106,
    CVE-2016-7777)

  - A guest on x86 systems could read small parts of
    hypervisor stack data (boo#1012651, CVE-2016-9932)

  - A malicious guest kernel could hang or crash the host
    system (boo#1014298, CVE-2016-10024)

  - A malicious guest administrator could escalate their
    privilege to that of the host. Only affects x86 HVM
    guests using qemu older version 1.6.0 or using the
    qemu-xen-traditional. (boo#1011652, CVE-2016-9637)

  - An unprivileged guest user could escalate privilege to
    that of the guest administrator on x86 HVM guests,
    especially on Intel CPUs (boo#1009100, CVE-2016-9386)

  - An unprivileged guest user could escalate privilege to
    that of the guest administrator (on AMD CPUs) or crash
    the system (on Intel CPUs) on 32-bit x86 HVM guests.
    Only guest operating systems that allowed a new task to
    start in VM86 mode were affected. (boo#1009103,
    CVE-2016-9382)

  - A malicious guest administrator could crash the host on
    x86 PV guests only (boo#1009104, CVE-2016-9385)

  - A malicious guest administrator could get privilege of
    the host emulator process on x86 HVM guests.
    (boo#1009109, CVE-2016-9381)

  - A vulnerability in pygrub allowed a malicious guest
    administrator to obtain the contents of sensitive host
    files, or even delete those files (boo#1009111,
    CVE-2016-9379, CVE-2016-9380)

  - A privileged guest user could cause an infinite loop in
    the RTL8139 ethernet emulation to consume CPU cycles on
    the host, causing a DoS situation (boo#1007157,
    CVE-2016-8910)

  - A privileged guest user could cause an infinite loop in
    the intel-hda sound emulation to consume CPU cycles on
    the host, causing a DoS situation (boo#1007160,
    CVE-2016-8909)

  - A privileged guest user could cause a crash of the
    emulator process on the host by exploiting a divide by
    zero vulnerability of the JAZZ RC4030 chipset emulation
    (boo#1005004 CVE-2016-8667)

  - A privileged guest user could cause a crash of the
    emulator process on the host by exploiting a divide by
    zero issue of the 16550A UART emulation (boo#1005005,
    CVE-2016-8669)

  - A privileged guest user could cause an infinite loop in
    the USB xHCI emulation, causing a DoS situation on the
    host (boo#1004016, CVE-2016-8576)

  - A privileged guest user could cause an infinite loop in
    the ColdFire Fash Ethernet Controller emulation, causing
    a DoS situation on the host (boo#1003030, CVE-2016-7908)

  - A privileged guest user could cause an infinite loop in
    the AMD PC-Net II emulation, causing a DoS situation on
    the host (boo#1003032, CVE-2016-7909)

  - Cause a reload of clvm in the block-dmmd script to avoid
    a blocking lvchange call (boo#1002496)

  - Also unplug SCSI disks in qemu-xen-traditional for
    upstream unplug protocol. Before a single SCSI storage
    devices added to HVM guests could appear multiple times
    in the guest. (boo#953518)

  - Fix a kernel panic / black screen when trying to boot a
    XEN kernel on some UEFI firmwares (boo#1000195)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1000106"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1000195"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1002496"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1003030"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1003032"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1004016"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1005004"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1005005"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1007157"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1007160"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1009100"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1009103"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1009104"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1009107"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1009109"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1009111"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1011652"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1012651"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1014298"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1016340"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=953518"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected xen packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-doc-html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-kmp-default");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-kmp-default-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-kmp-desktop");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-kmp-desktop-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-libs-32bit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-libs-debuginfo-32bit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools-domU");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools-domU-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:13.2");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/03");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 Tenable Network Security, Inc.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE13\.2)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "13.2", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE13.2", reference:"xen-debugsource-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"xen-devel-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"xen-libs-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"xen-libs-debuginfo-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"xen-tools-domU-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"xen-tools-domU-debuginfo-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-doc-html-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-kmp-default-4.4.4_06_k3.16.7_53-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-kmp-default-debuginfo-4.4.4_06_k3.16.7_53-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-kmp-desktop-4.4.4_06_k3.16.7_53-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-kmp-desktop-debuginfo-4.4.4_06_k3.16.7_53-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-libs-32bit-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-libs-debuginfo-32bit-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-tools-4.4.4_06-58.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", cpu:"x86_64", reference:"xen-tools-debuginfo-4.4.4_06-58.1") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xen-debugsource / xen-devel / xen-libs-32bit / xen-libs / etc");
}
  • NASL familyOracleVM Local Security Checks
    NASL idORACLEVM_OVMSA-2017-0153.NASL
    descriptionThe remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0153 for details.
    last seen2020-06-01
    modified2020-06-02
    plugin id103830
    published2017-10-13
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103830
    titleOracleVM 3.4 : xen (OVMSA-2017-0153)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2017-4.NASL
    descriptionThis updates xen to version 4.5.5 to fix the following issues : - An unprivileged user in a guest could gain guest could escalate privilege to that of the guest kernel, if it had could invoke the instruction emulator. Only 64-bit x86 HVM guest were affected. Linux guest have not been vulnerable. (boo#1016340, CVE-2016-10013) - An unprivileged user in a 64 bit x86 guest could gain information from the host, crash the host or gain privilege of the host (boo#1009107, CVE-2016-9383) - An unprivileged guest process could (unintentionally or maliciously) obtain or ocorrupt sensitive information of other programs in the same guest. Only x86 HVM guests have been affected. The attacker needs to be able to trigger the Xen instruction emulator. (boo#1000106, CVE-2016-7777) - A guest on x86 systems could read small parts of hypervisor stack data (boo#1012651, CVE-2016-9932) - A malicious guest kernel could hang or crash the host system (boo#1014298, CVE-2016-10024) - The epro100 emulated network device caused a memory leak in the host when unplugged in the guest. A privileged user in the guest could use this to cause a DoS on the host or potentially crash the guest process on the host (boo#1013668, CVE-2016-9101) - The ColdFire Fast Ethernet Controller was vulnerable to an infinite loop that could be trigged by a privileged user in the guest, leading to DoS (boo#1013657, CVE-2016-9776) - A malicious guest administrator could escalate their privilege to that of the host. Only affects x86 HVM guests using qemu older version 1.6.0 or using the qemu-xen-traditional. (boo#1011652, CVE-2016-9637) - An unprivileged guest user could escalate privilege to that of the guest administrator on x86 HVM guests, especially on Intel CPUs (boo#1009100, CVE-2016-9386) - An unprivileged guest user could escalate privilege to that of the guest administrator (on AMD CPUs) or crash the system (on Intel CPUs) on 32-bit x86 HVM guests. Only guest operating systems that allowed a new task to start in VM86 mode were affected. (boo#1009103, CVE-2016-9382) - A malicious guest administrator could crash the host on x86 PV guests only (boo#1009104, CVE-2016-9385) - An unprivileged guest user was able to crash the guest. (boo#1009108, CVE-2016-9377, CVE-2016-9378) - A malicious guest administrator could get privilege of the host emulator process on x86 HVM guests. (boo#1009109, CVE-2016-9381) - A vulnerability in pygrub allowed a malicious guest administrator to obtain the contents of sensitive host files, or even delete those files (boo#1009111, CVE-2016-9379, CVE-2016-9380) - A privileged guest user could cause an infinite loop in the RTL8139 ethernet emulation to consume CPU cycles on the host, causing a DoS situation (boo#1007157, CVE-2016-8910) - A privileged guest user could cause an infinite loop in the intel-hda sound emulation to consume CPU cycles on the host, causing a DoS situation (boo#1007160, CVE-2016-8909) - A privileged guest user could cause a crash of the emulator process on the host by exploiting a divide by zero vulnerability of the JAZZ RC4030 chipset emulation (boo#1005004 CVE-2016-8667) - A privileged guest user could cause a crash of the emulator process on the host by exploiting a divide by zero issue of the 16550A UART emulation (boo#1005005, CVE-2016-8669) - A privileged guest user could cause a memory leak in the USB EHCI emulation, causing a DoS situation on the host (boo#1003870, CVE-2016-7995) - A privileged guest user could cause an infinite loop in the USB xHCI emulation, causing a DoS situation on the host (boo#1004016, CVE-2016-8576) - A privileged guest user could cause an infinite loop in the ColdFire Fash Ethernet Controller emulation, causing a DoS situation on the host (boo#1003030, CVE-2016-7908) - A privileged guest user could cause an infinite loop in the AMD PC-Net II emulation, causing a DoS situation on the host (boo#1003032, CVE-2016-7909) - Cause a reload of clvm in the block-dmmd script to avoid a blocking lvchange call (boo#1002496)
    last seen2020-06-05
    modified2017-01-03
    plugin id96252
    published2017-01-03
    reporterThis script is Copyright (C) 2017-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/96252
    titleopenSUSE Security Update : xen (openSUSE-2017-4)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201612-56.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201612-56 (Xen: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Xen. Please review the CVE identifiers referenced below for details. Impact : A local attacker could possibly execute arbitrary code with the privileges of the process, could gain privileges on the host system, cause a Denial of Service condition, or obtain sensitive information. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id96231
    published2017-01-03
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/96231
    titleGLSA-201612-56 : Xen: Multiple vulnerabilities
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-68B71978A1.NASL
    descriptionxen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-12-05
    plugin id95491
    published2016-12-05
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95491
    titleFedora 23 : xen (2016-68b71978a1)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-95C104A4C6.NASL
    descriptionxen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-12-05
    plugin id95492
    published2016-12-05
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95492
    titleFedora 24 : xen (2016-95c104a4c6)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-3067-1.NASL
    descriptionxen was updated to version 4.7.1 to fix 17 security issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652). - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100). - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103). - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104). - CVE-2016-9384: Guest 32-bit ELF symbol table load leaking host data to unprivileged guest users (bsc#1009105). - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107). - CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108). - CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109). - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106). - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157). - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004). - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005). - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030). - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032). The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id95709
    published2016-12-12
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95709
    titleSUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3067-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-3273-1.NASL
    descriptionThis update for xen fixes several issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652) - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100) - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103) - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109) - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106) - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157) - CVE-2016-8909: The intel_hda_xfer function in hw/audio/intel-hda.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) via an entry with the same value for buffer length and pointer position (bsc#1007160) - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004) - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005) - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030) - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id96150
    published2016-12-27
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/96150
    titleSUSE SLES11 Security Update : xen (SUSE-SU-2016:3273-1)
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_56F0F11EBA4D11E6AE1B002590263BF5.NASL
    descriptionThe Xen Project reports : The x86 instructions BT, BTC, BTR, and BTS, when used with a destination memory operand and a source register rather than an immediate operand, access a memory location offset from that specified by the memory operand as specified by the high bits of the register source. A malicious guest can modify arbitrary memory, allowing for arbitrary code execution (and therefore privilege escalation affecting the whole host), a crash of the host (leading to a DoS), or information leaks. The vulnerability is sometimes exploitable by unprivileged guest user processes.
    last seen2020-06-01
    modified2020-06-02
    plugin id95509
    published2016-12-05
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95509
    titleFreeBSD : xen-kernel -- x86 64-bit bit test instruction emulation broken (56f0f11e-ba4d-11e6-ae1b-002590263bf5)
  • NASL familyMisc.
    NASL idXEN_SERVER_XSA-198.NASL
    descriptionAccording to its self-reported version number, the Xen hypervisor installed on the remote host is missing a security update. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the inject_swint() function in x86_emulate.c due to improper handling of the format of IDT lookups when emulating instructions which generate software interrupts. A guest attacker can exploit this to crash the host, resulting in a denial of service condition. (CVE-2016-9377) - A flaw exists in the svm_inject_trap() function in svm.c due to a failure to properly perform IDT privilege checks when emulating instructions which generate software interrupts. A guest attacker can exploit this to crash the host, resulting in a denial of service condition. (CVE-2016-9378) - A flaw exists in the sniff_netware() function in file tools/pygrub/src/pygrub due to improper handling of string quotes and S-expressions in the bootloader when the S-expressions output format is requested. A guest attacker can exploit this to cause the bootloader configuration file to produce incorrect output, resulting in the disclosure or deletion of files from the host. (CVE-2016-9379) - A flaw exists in the sniff_netware() function in file tools/pygrub/src/pygrub due to improper handling of NULL bytes in the bootloader when the null-delimited output format is requested. A guest attacker can exploit this to cause configuration files to output ambiguous or confusing results, resulting in the disclosure or deletion of files from the host. (CVE-2016-9380) - A double-fetch flaw exists that is triggered when the compiler omits QEMU optimizations. A guest attacker can exploit this to gain elevated privileges on the host. (CVE-2016-9381) - A flaw exists in the hvm_task_switch() function in hvm.c due to improper handling of x86 task switching to VM86 mode. A guest attacker can exploit this to cause a denial of service condition or gain elevated privileges within the guest environment. (CVE-2016-9382) - A flaw exists in the x86_emulate() function in x86_emulate.c that allows a guest attacker to cause changes to memory and thereby gain elevated privileges on the host. (CVE-2016-9383) - A flaw exists that is triggered as unused bytes in image metadata are not properly cleared during symbol table loading. This may allow a guest attacker to disclose potentially sensitive information from the host. (CVE-2016-9384) - A flaw exists due to improper clearing of unused bytes in image metadata during symbol table loading. A guest attacker can exploit this to disclose sensitive information from the host. (CVE-2016-9384) - A flaw exists in the x86 segment base write emulation due to a lack of canonical address checks. A guest attacker can exploit this issue to crash the host, resulting in a denial of service condition. (CVE-2016-9385) - A flaw exists in the x86 emulator due to improper validation of the usability of segments when performing memory accesses. A guest attacker can exploit this to gain elevated privileges within the guest environment. (CVE-2016-9386) Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.
    last seen2020-06-01
    modified2020-06-02
    plugin id95630
    published2016-12-08
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95630
    titleXen Multiple Vulnerabilities (XSA-191 - XSA-198)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-3174-1.NASL
    descriptionThis update for xen fixes several issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652) - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100) - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103) - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104) - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109) - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106) - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157) - CVE-2016-8909: The intel_hda_xfer function in hw/audio/intel-hda.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) via an entry with the same value for buffer length and pointer position (bsc#1007160) - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004) - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005) - CVE-2016-8576: The xhci_ring_fetch function in hw/usb/hcd-xhci.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by leveraging failure to limit the number of link Transfer Request Blocks (TRB) to process (bsc#1004016) - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030) - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id96032
    published2016-12-20
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/96032
    titleSUSE SLES11 Security Update : xen (SUSE-SU-2016:3174-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-3083-1.NASL
    descriptionThis update for xen to version 4.5.5 fixes several issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652) - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100) - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103) - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104) - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107) - CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109) - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106) - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157) - CVE-2016-8909: The intel_hda_xfer function in hw/audio/intel-hda.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) via an entry with the same value for buffer length and pointer position (bsc#1007160). - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004) - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005) - CVE-2016-7995: A memory leak in ehci_process_itd allowed a privileged user inside guest to DoS the host (bsc#1003870). - CVE-2016-8576: The xhci_ring_fetch function in hw/usb/hcd-xhci.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by leveraging failure to limit the number of link Transfer Request Blocks (TRB) to process (bsc#1004016). - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030) - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id95761
    published2016-12-13
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95761
    titleSUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3083-1)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3729.NASL
    descriptionMultiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2016-7777 (XSA-190) Jan Beulich from SUSE discovered that Xen does not properly honor CR0.TS and CR0.EM for x86 HVM guests, potentially allowing guest users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it. - CVE-2016-9379, CVE-2016-9380 (XSA-198) Daniel Richman and Gabor Szarka of the Cambridge University Student-Run Computing Facility discovered that pygrub, the boot loader emulator, fails to quote (or sanity check) its results when reporting them to its caller. A malicious guest administrator can take advantage of this flaw to cause an information leak or denial of service. - CVE-2016-9382 (XSA-192) Jan Beulich of SUSE discovered that Xen does not properly handle x86 task switches to VM86 mode. A unprivileged guest process can take advantage of this flaw to crash the guest or, escalate its privileges to that of the guest operating system. - CVE-2016-9383 (XSA-195) George Dunlap of Citrix discovered that the Xen x86 64-bit bit test instruction emulation is broken. A malicious guest can take advantage of this flaw to modify arbitrary memory, allowing for arbitrary code execution, denial of service (host crash), or information leaks. - CVE-2016-9385 (XSA-193) Andrew Cooper of Citrix discovered that Xen
    last seen2020-06-01
    modified2020-06-02
    plugin id95610
    published2016-12-08
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95610
    titleDebian DSA-3729-1 : xen - security update
  • NASL familyOracleVM Local Security Checks
    NASL idORACLEVM_OVMSA-2016-0165.NASL
    descriptionThe remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2016-0165 for details.
    last seen2020-06-01
    modified2020-06-02
    plugin id95279
    published2016-11-23
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95279
    titleOracleVM 3.3 : xen (OVMSA-2016-0165)
  • NASL familyMisc.
    NASL idCITRIX_XENSERVER_CTX218775.NASL
    descriptionThe version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the sniff_netware() function within file tools/pygrub/src/pygrub when handling string quotes and S-expressions in the bootloader whenever the S-expressions output format is requested. A guest attacker can exploit this to cause the bootloader configuration file to produce incorrect output, resulting in the disclosure or deletion of files from the host. (CVE-2016-9379) - A flaw exists in the sniff_netware() function within file tools/pygrub/src/pygrub when handling NULL bytes in the bootloader whenever the null-delimited output format is requested. A guest attacker can exploit this to cause configuration files to output ambiguous or confusing results, resulting in the disclosure or deletion of files from the host. (CVE-2016-9380) - A double-fetch flaw exists that is triggered when the compiler omits QEMU optimizations. A guest attacker can exploit this to gain elevated privileges on the host. (CVE-2016-9381) - A flaw exists in the hvm_task_switch() function within file arch/x86/hvm/hvm.c due to improper handling of x86 task switching to VM86 mode. A guest attacker can exploit this to cause a denial of service condition or gain elevated privileges within the guest environment. (CVE-2016-9382) - A flaw exists in the x86_emulate() function within file arch/x86/x86_emulate/x86_emulate.c that allows a guest attacker to cause changes to memory and thereby gain elevated privileges on the host. (CVE-2016-9383) - A denial of service vulnerability exists in the x86 segment base write emulation that is related to lacking canonical address checks. A local attacker who has administrative rights within a guest can exploit this issue to crash the host. (CVE-2016-9385) - A flaw exists in the x86 emulator due to improper checking of the usability of segments when performing memory accesses. A guest attacker can exploit this to gain elevated privileges. (CVE-2016-9386)
    last seen2020-06-01
    modified2020-06-02
    plugin id95539
    published2016-12-05
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95539
    titleCitrix XenServer Multiple Vulnerabilities (CTX218775)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-3156-1.NASL
    descriptionThis update for xen fixes several issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652) - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100) - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103) - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104) - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109) - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106) - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157) - CVE-2016-8909: The intel_hda_xfer function in hw/audio/intel-hda.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) via an entry with the same value for buffer length and pointer position (bsc#1007160) - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004) - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005) - CVE-2016-8576: The xhci_ring_fetch function in hw/usb/hcd-xhci.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by leveraging failure to limit the number of link Transfer Request Blocks (TRB) to process (bsc#1004016) - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030) - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id95822
    published2016-12-14
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95822
    titleSUSE SLES12 Security Update : xen (SUSE-SU-2016:3156-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-3044-1.NASL
    descriptionxen was updated to fix several security issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652). - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100) - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103) - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109) - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106) - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157) - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004) - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005) - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030) - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032) - CVE-2016-6351: The esp_do_dma function in hw/scsi/esp.c, when built with ESP/NCR53C9x controller emulation support, allowed local guest OS administrators to cause a denial of service (out-of-bounds write and QEMU process crash) or execute arbitrary code on the host via vectors involving DMA read into ESP command buffer (bsc#990843) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id95624
    published2016-12-08
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95624
    titleSUSE SLES11 Security Update : xen (SUSE-SU-2016:3044-1)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2016-1477.NASL
    descriptionxen was updated to version 4.7.1 to fix 17 security issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652). - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100). - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103). - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104). - CVE-2016-9384: Guest 32-bit ELF symbol table load leaking host data to unprivileged guest users (bsc#1009105). - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107). - CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108). - CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109). - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106). - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157). - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004). - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005). - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030). - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032). These non-security issues were fixed : - bsc#1004981: Xen RPM didn
    last seen2020-06-05
    modified2016-12-16
    plugin id95910
    published2016-12-16
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/95910
    titleopenSUSE Security Update : xen (openSUSE-2016-1477)
  • NASL familyOracleVM Local Security Checks
    NASL idORACLEVM_OVMSA-2016-0166.NASL
    descriptionThe remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2016-0166 for details.
    last seen2020-06-01
    modified2020-06-02
    plugin id95280
    published2016-11-23
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95280
    titleOracleVM 3.2 : xen (OVMSA-2016-0166)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-999E1A6927.NASL
    descriptionxen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] guest 32-bit ELF symbol table load leaking host data [XSA-194, CVE-2016-9384] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-12-05
    plugin id95493
    published2016-12-05
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95493
    titleFedora 25 : xen (2016-999e1a6927)

References