Vulnerabilities > CVE-2018-19967 - Improper Input Validation vulnerability in multiple products

047910
CVSS 4.9 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
COMPLETE
local
low complexity
xen
debian
CWE-20
nessus
NVD
Published: 2018-12-08
Updated: 2019-04-17

Summary

An issue was discovered in Xen through 4.11.x on Intel x86 platforms allowing guest OS users to cause a denial of service (host OS hang) because Xen does not work around Intel's mishandling of certain HLE transactions associated with the KACQUIRE instruction prefix.

Vulnerable Configurations

Part Description Count
OS
Xen
1
OS
Debian
1

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 familyMisc.
    NASL idCITRIX_XENSERVER_CTX239432.NASL
    descriptionThe version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities. All of which allow a denial-of-service attack and one allowing privilege escalation as well as information disclosure. Please refer to the vendor advisory for mitigating factors.
    last seen2020-06-01
    modified2020-06-02
    plugin id119148
    published2018-11-26
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119148
    titleCitrix XenServer Multiple Vulnerabilities (CTX239432)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(119148);
  script_version("1.4");
  script_cvs_date("Date: 2019/11/01");

  script_cve_id(
    "CVE-2018-19961",
    "CVE-2018-19962",
    "CVE-2018-19965",
    "CVE-2018-19967"
  );
  script_bugtraq_id(105985, 106182);
  script_xref(name:"IAVA", value:"2018-A-0381");

  script_name(english:"Citrix XenServer Multiple Vulnerabilities (CTX239432)");
  script_summary(english:"Checks for patches.");

  script_set_attribute(attribute:"synopsis", value:
"A server virtualization platform installed on the remote host is
missing a security patch.");
  script_set_attribute(attribute:"description", value:
"The version of Citrix XenServer running on the remote host is missing
a security hotfix. It is, therefore, affected by multiple
vulnerabilities. All of which allow a denial-of-service attack and one
allowing privilege escalation as well as information disclosure.
Please refer to the vendor advisory for mitigating factors.");
  script_set_attribute(attribute:"see_also", value:"https://support.citrix.com/article/CTX239432");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate hotfix according to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/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:H/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:"cvss_score_source", value:"CVE-2018-19961");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/11/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/11/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:citrix:xenserver");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("citrix_xenserver_version.nbin");
  script_require_keys("Host/XenServer/version", "Host/local_checks_enabled");

  exit(0);
}

include("vcf.inc");
include("vcf_extras.inc");

app_info = vcf::xenserver::get_app_info();

constraints = [
  { "equal" : "7.0",    "patches" :           # XenServer 7.0
                          ["XS70E064"] },     # CTX239434
  { "equal" : "7.1.1",  "patches" :           # XenServer 7.1 LTSR CU1
                          ["XS71ECU1032"] },  # CTX239435
  { "equal" : "7.5",    "patches" :           # XenServer 7.5
                          ["XS75E007"] },     # CTX239436
  { "equal" : "7.6",    "patches" :           # XenServer 7.6
                          ["XS76E002"] }      # CTX239437
];

vcf::xenserver::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4369.NASL
    descriptionMultiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2018-19961 / CVE-2018-19962 Paul Durrant discovered that incorrect TLB handling could result in denial of service, privilege escalation or information leaks. - CVE-2018-19965 Matthew Daley discovered that incorrect handling of the INVPCID instruction could result in denial of service by PV guests. - CVE-2018-19966 It was discovered that a regression in the fix to address CVE-2017-15595 could result in denial of service, privilege escalation or information leaks by a PV guest. - CVE-2018-19967 It was discovered that an error in some Intel CPUs could result in denial of service by a guest instance.
    last seen2020-03-17
    modified2019-01-15
    plugin id121168
    published2019-01-15
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121168
    titleDebian DSA-4369-1 : xen - security update
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4369. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(121168);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/02/24");

  script_cve_id("CVE-2018-19961", "CVE-2018-19962", "CVE-2018-19965", "CVE-2018-19966", "CVE-2018-19967");
  script_xref(name:"DSA", value:"4369");

  script_name(english:"Debian DSA-4369-1 : xen - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Multiple vulnerabilities have been discovered in the Xen hypervisor :

  - CVE-2018-19961 / CVE-2018-19962
    Paul Durrant discovered that incorrect TLB handling
    could result in denial of service, privilege escalation
    or information leaks.

  - CVE-2018-19965
    Matthew Daley discovered that incorrect handling of the
    INVPCID instruction could result in denial of service by
    PV guests.

  - CVE-2018-19966
    It was discovered that a regression in the fix to
    address CVE-2017-15595 could result in denial of
    service, privilege escalation or information leaks by a
    PV guest.

  - CVE-2018-19967
    It was discovered that an error in some Intel CPUs could
    result in denial of service by a guest instance."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-19961"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-19962"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-19965"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-19966"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2017-15595"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-19967"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/xen"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/xen"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2019/dsa-4369"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the xen packages.

For the stable distribution (stretch), these problems have been fixed
in version 4.8.5+shim4.10.2+xsa282-1+deb9u11."
  );
  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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 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:"9.0", prefix:"libxen-4.8", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"libxen-dev", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"libxenstore3.0", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-hypervisor-4.8-amd64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-hypervisor-4.8-arm64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-hypervisor-4.8-armhf", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-system-amd64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-system-arm64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-system-armhf", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-utils-4.8", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xen-utils-common", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++;
if (deb_check(release:"9.0", prefix:"xenstore-utils", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) 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 idSUSE_SU-2019-0921-1.NASL
    descriptionThis update for xen fixes the following issues : Security issues fixed : Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157). Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process to read uninitialised stack memory contents (bsc#1129623). CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) Other issue addressed: Added Xen cmdline option
    last seen2020-06-01
    modified2020-06-02
    plugin id123993
    published2019-04-11
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123993
    titleSUSE SLES12 Security Update : xen (SUSE-SU-2019:0921-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-0875-1.NASL
    descriptionThis update for xen fixes the following issues : Security issues fixed : CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). Fixed an issue which could allow malicious or buggy x86 PV guest kernels to mount a Denial of Service attack affecting the whole system (bsc#1126197). Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). Other issues fixed: Upstream bug fixes (bsc#1027519) Fixed an issue where setup of grant_tables and other variables may fail (bsc#1126325). Added a requirement for xen, xl.cfg firmware=
    last seen2020-06-01
    modified2020-06-02
    plugin id123783
    published2019-04-05
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123783
    titleSUSE SLED15 / SLES15 Security Update : Recommended update for xen (SUSE-SU-2019:0875-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-0003-1.NASL
    descriptionThis update for xen fixes the following issues : Update to Xen 4.11.1 bug fix release (bsc#1027519) CVE-2018-17963: Fixed an integer overflow issue in the QEMU emulator, which could occur when a packet with large packet size is processed. A user inside a guest could have used this flaw to crash the qemu process resulting in a Denial of Service (DoS). (bsc#1111014) CVE-2018-18849: Fixed an out of bounds memory access in the LSI53C895A SCSI host bus adapter emulation, which allowed a user and/or process to crash the qemu process resulting in a Denial of Service (DoS). (bsc#1114423) CVE-2018-18883: Fixed an issue related to inproper restriction of nested VT-x, which allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS). (XSA-278) (bsc#1114405) CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access. (XSA-275) (bsc#1115040) CVE-2018-19963: Fixed the allocation of pages used to communicate with external emulators, which may have cuased Xen to crash, resulting in a Denial of Service (DoS). (XSA-276) (bsc#1115043) CVE-2018-19965: Fixed an issue related to the INVPCID instruction in case non-canonical addresses are accessed, which may allow a guest to cause Xen to crash, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-279) (bsc#1115045) CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240, which conflicted with shadow paging and allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS) (XSA-280) (bsc#1115047) CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) CVE-2018-19964: Fixed the incorrect error handling of p2m page removals, which allowed a guest to cause a deadlock, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-277) (bsc#1115044) CVE-2018-19665: Fixed an integer overflow resulting in memory corruption in various Bluetooth functions, allowing this to crash qemu process resulting in Denial of Service (DoS). (bsc#1117756). Other bugs fixed: Fixed an issue related to a domU hang on SLE12-SP3 HV (bsc#1108940) 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 seen2020-03-18
    modified2019-01-07
    plugin id120983
    published2019-01-07
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/120983
    titleSUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2019:0003-1)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-1226.NASL
    descriptionThis update for xen fixes the following issues : Security issues fixed : - CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) - CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157). - Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). - Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). - Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). - CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process to read uninitialised stack memory contents (bsc#1129623). - CVE-2018-19961 CVE-2018-19962: Fixed insufficient TLB flushing / improper large page mappings with AMD IOMMUs (XSA-275)(bsc#1115040). - CVE-2018-19965: Fixed denial of service issue from attempting to use INVPCID with a non-canonical addresses (XSA-279)(bsc#1115045). - CVE-2018-19966: Fixed issue introduced by XSA-240 that could have caused conflicts with shadow paging (XSA-280)(bsc#1115047). - Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). - Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). - Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). - Fixed an issue which could allow malicious or buggy x86 PV guest kernels to mount a Denial of Service attack affecting the whole system (bsc#1126197). - Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). - Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Other issues addressed : - Upstream bug fixes (bsc#1027519) - Fixed an issue where live migrations were failing when spectre was enabled on xen boot cmdline (bsc#1116380). - Fixed an issue where setup of grant_tables and other variables may fail (bsc#1126325). - Fixed a building issue (bsc#1119161). - Fixed an issue where xpti=no-dom0 was not working as expected (bsc#1105528). - Packages should no longer use /var/adm/fillup-templates (bsc#1069468). - Added Xen cmdline option
    last seen2020-06-01
    modified2020-06-02
    plugin id124147
    published2019-04-18
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/124147
    titleopenSUSE Security Update : xen (openSUSE-2019-1226)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-0825-1.NASL
    descriptionThis update for xen fixes the following issues : Security issues fixed : CVE-2018-18849: Fixed an out of bounds memory access issue that was found in the LSI53C895A SCSI Host Bus Adapter emulation while writing a message in lsi_do_msgin. It could occur during migration if the
    last seen2020-06-01
    modified2020-06-02
    plugin id123633
    published2019-04-02
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123633
    titleSUSE SLES12 Security Update : xen (SUSE-SU-2019:0825-1)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-1199.NASL
    descriptionThis update for xen fixes the following issues : Security issues fixed : - CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) - Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). - Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). - Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). - Fixed an issue which could allow malicious or buggy x86 PV guest kernels to mount a Denial of Service attack affecting the whole system (bsc#1126197). - Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). - Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). - Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). - Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). - Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). Other issues fixed : - Upstream bug fixes (bsc#1027519) - Fixed an issue where setup of grant_tables and other variables may fail (bsc#1126325). - Added a requirement for xen, xl.cfg firmware=
    last seen2020-06-01
    modified2020-06-02
    plugin id124141
    published2019-04-18
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/124141
    titleopenSUSE Security Update : xen (openSUSE-2019-1199)
  • NASL familyMisc.
    NASL idXEN_SERVER_XSA-282.NASL
    descriptionAccording to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a guest-to-host denial of service vulnerability. Only Intel based x86 systems are affected. 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 id119288
    published2018-11-29
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119288
    titleXen Project HLE Transaction 'XACQUIRE' DoS (XSA-282)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-0827-1.NASL
    descriptionThis update for xen fixes the following issues : Security issues fixed : CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157). CVE-2017-13672: Fixed an out of bounds read access during display update (bsc#1056336). Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140) Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). CVE-2018-18849: Fixed an out of bounds msg buffer access which could lead to denial of service (bsc#1114423). Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). CVE-2018-17958: Fixed an integer overflow leading to a buffer overflow in the rtl8139 component (bsc#1111007) CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) CVE-2018-19665: Fixed an integer overflow resulting in memory corruption in various Bluetooth functions, allowing this to crash qemu process resulting in Denial of Service (DoS). (bsc#1117756). CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process to read uninitialised stack memory contents (bsc#1129623). CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access. (XSA-275) (bsc#1115040) CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240, which conflicted with shadow paging and allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS) (XSA-280) (bsc#1115047). CVE-2018-10839: Fixed an integer overflow leading to a buffer overflow in the ne2000 component (bsc#1110924). CVE-2018-19965: Fixed an issue related to the INVPCID instruction in case non-canonical addresses are accessed, which may allow a guest to cause Xen to crash, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-279) (bsc#1115045). Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). CVE-2018-17963: Fixed an integer overflow in relation to large packet sizes, leading to a denial of service (DoS). (bsc#1111014). Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). CVE-2018-17962: Fixed an integer overflow leading to a buffer overflow in the pcnet component (bsc#1111011) CVE-2018-18438: Fixed an integer overflow in ccid_card_vscard_read function which could lead to memory corruption (bsc#1112188). Other issues fixed: Upstream bug fixes (bsc#1027519) Fixed an issue where XEN SLE12-SP1 domU hangs on SLE12-SP3 HV1108940 (bsc#1108940). 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 id123634
    published2019-04-02
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123634
    titleSUSE SLES12 Security Update : xen (SUSE-SU-2019:0827-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-13921-1.NASL
    descriptionThis update for xen fixes the following issues : Security vulnerabilities fixed : CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access. (XSA-275) (bsc#1115040) CVE-2018-19965: Fixed an issue related to the INVPCID instruction in case non-canonical addresses are accessed, which may allow a guest to cause Xen to crash, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-279) (bsc#1115045) CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240, which conflicted with shadow paging and allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS) (XSA-280) (bsc#1115047) CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) CVE-2018-19665: Fixed an integer overflow resulting in memory corruption in various Bluetooth functions, allowing this to crash qemu process resulting in Denial of Service (DoS). (bsc#1117756). CVE-2018-18849: Fixed an out of bounds memory access in the LSI53C895A SCSI host bus adapter emulation, which allowed a user and/or process to crash the qemu process resulting in a Denial of Service (DoS). (bsc#1114423) Fixed an integer overflow in ccid_card_vscard_read(), which allowed for memory corruption. (bsc#1112188) CVE-2017-13672: Fixed an out of bounds read access during display update (bsc#1056336) CVE-2018-17958: Fixed an integer overflow leading to a buffer overflow in the rtl8139 component (bsc#1111007) CVE-2018-17962: Fixed an integer overflow leading to a buffer overflow in the pcnet component (bsc#1111011) CVE-2018-17963: Fixed an integer overflow in relation to large packet sizes, leading to a denial of service (DoS). (bsc#1111014) CVE-2018-10839: Fixed an integer overflow leading to a buffer overflow in the ne2000 component (bsc#1110924) Other bugs fixed: Fixed an issue related to a domU hang on SLE12-SP3 HV (bsc#1108940) Upstream bug fixes (bsc#1027519) Fixed crashing VMs when migrating between dom0 hosts (bsc#1031382) Fixed an issue with xpti=no-dom0 not working as expected (bsc#1105528) 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 seen2020-03-18
    modified2019-01-08
    plugin id121004
    published2019-01-08
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121004
    titleSUSE SLES11 Security Update : xen (SUSE-SU-2019:13921-1)

References