Vulnerabilities > CVE-2017-8905 - Incorrect Calculation vulnerability in XEN

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2017:1770-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(101224);
  script_version("3.8");
  script_cvs_date("Date: 2019/09/11 11:22:15");

  script_cve_id("CVE-2017-8112", "CVE-2017-8309", "CVE-2017-8905", "CVE-2017-9330", "CVE-2017-9374", "CVE-2017-9503");

  script_name(english:"SUSE SLES11 Security Update : xen (SUSE-SU-2017:1770-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for xen fixes several issues. These security issues were
fixed :

  - blkif responses leaked backend stack data, which allowed
    unprivileged guest to obtain sensitive information from
    the host or other guests (XSA-216, bsc#1042863)

  - Page transfer might have allowed PV guest to elevate
    privilege (XSA-217, bsc#1042882)

  - Races in the grant table unmap code allowed for
    informations leaks and potentially privilege escalation
    (XSA-218, bsc#1042893)

  - Insufficient reference counts during shadow emulation
    allowed a malicious pair of guest to elevate their
    privileges to the privileges that XEN runs under
    (XSA-219, bsc#1042915)

  - Stale P2M mappings due to insufficient error checking
    allowed malicious guest to leak information or elevate
    privileges (XSA-222, bsc#1042931)

  - Grant table operations mishandled reference counts
    allowing malicious guests to escape (XSA-224,
    bsc#1042938)

  - CVE-2017-9330: USB OHCI Emulation in qemu allowed local
    guest OS users to cause a denial of service (infinite
    loop) by leveraging an incorrect return value
    (bsc#1042160)

  - CVE-2017-8309: Memory leak in the audio/audio.c allowed
    remote attackers to cause a denial of service (memory
    consumption) by repeatedly starting and stopping audio
    capture (bsc#1037243)

  - CVE-2017-8905: Xen a failsafe callback, which might have
    allowed PV guest OS users to execute arbitrary code on
    the host OS (XSA-215, bsc#1034845).

  - CVE-2017-9503: The MegaRAID SAS 8708EM2 Host Bus Adapter
    emulation support was vulnerable to a NULL pointer
    dereference issue which allowed a privileged user inside
    guest to crash the Qemu process on the host resulting in
    DoS (bsc#1043297)

  - CVE-2017-9374: Missing free of 's->ipacket', causes a
    host memory leak, allowing for DoS (bsc#1043074)

  - CVE-2017-8112: hw/scsi/vmw_pvscsi.c allowed local guest
    OS privileged users to cause a denial of service
    (infinite loop and CPU consumption) via the message ring
    page count (bsc#1036470)

  - Missing NULL pointer check in event channel poll allows
    guests to DoS the host (XSA-221, bsc#1042924)

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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1014136"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1026236"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1027519"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1031460"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1032148"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1034845"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1036470"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1037243"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042160"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042863"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042882"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042893"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042915"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042924"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042931"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1042938"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1043074"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1043297"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-8112/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-8309/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-8905/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-9330/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-9374/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-9503/"
  );
  # https://www.suse.com/support/update/announcement/2017/suse-su-20171770-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?9aad2bf2"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Software Development Kit 11-SP4:zypper in -t
patch sdksp4-xen-13193=1

SUSE Linux Enterprise Server 11-SP4:zypper in -t patch
slessp4-xen-13193=1

SUSE Linux Enterprise Debuginfo 11-SP4:zypper in -t patch
dbgsp4-xen-13193=1

To bring your system up-to-date, use 'zypper patch'."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:novell:suse_linux:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-doc-html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-kmp-default");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-kmp-pae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools-domU");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/05/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/05");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES11", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
if (cpu >!< "i386|i486|i586|i686|x86_64") audit(AUDIT_ARCH_NOT, "i386 / i486 / i586 / i686 / x86_64", cpu);


sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-kmp-default-4.4.4_20_3.0.101_104-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-libs-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-tools-domU-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-doc-html-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-libs-32bit-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-tools-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"xen-kmp-pae-4.4.4_20_3.0.101_104-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"i586", reference:"xen-kmp-default-4.4.4_20_3.0.101_104-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"i586", reference:"xen-libs-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"i586", reference:"xen-tools-domU-4.4.4_20-60.3")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"i586", reference:"xen-kmp-pae-4.4.4_20_3.0.101_104-60.3")) 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");
}

#
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from OracleVM
# Security Advisory OVMSA-2017-0116.
#

include("compat.inc");

if (description)
{
  script_id(101195);
  script_version("3.6");
  script_cvs_date("Date: 2019/09/27 13:00:35");

  script_cve_id("CVE-2017-8903", "CVE-2017-8904", "CVE-2017-8905");

  script_name(english:"OracleVM 3.4 : xen (OVMSA-2017-0116)");
  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: xen
    commit=74b662e79bc874fe8ad8a93d2891e6569c380004

  - BUILDINFO: QEMU upstream
    commit=8bff6989bd0bafcc0ddf859c23ce6a2ff21a80ff

  - BUILDINFO: QEMU traditional
    commit=346fdd7edd73f8287d0d0a2bab9c67b71bc6b8ba

  - BUILDINFO: IPXE
    commit=9a93db3f0947484e30e753bbd61a10b17336e20e

  - BUILDINFO: SeaBIOS
    commit=7d9cbe613694924921ed1a6f8947d711c5832eee

  - gnttab: __gnttab_unmap_common_complete is all-or-nothing
    (Jan Beulich) [Orabug: 26288614]

  - gnttab: correct logic to get page references during map
    requests (George Dunlap) [Orabug: 26288614]

  - gnttab: never create host mapping unless asked to (Jan
    Beulich) 

  - gnttab: Fix handling of dev_bus_addr during unmap
    (George Dunlap) 

  - x86/shadow: Hold references for the duration of emulated
    writes (Andrew Cooper) [Orabug: 26288568]

  - x86/mm: disallow page stealing from HVM domains (Jan
    Beulich) 

  - guest_physmap_remove_page needs its return value checked
    (Jan Beulich) [Orabug: 26288602]

  - xen/memory: Fix return value handing of
    guest_remove_page (Andrew Cooper) [Orabug: 26288602]

  - evtchn: avoid NULL derefs (Jan Beulich) [Orabug:
    26288583]

  - gnttab: correct maptrack table accesses (Jan Beulich)
    [Orabug: 26288557]

  - gnttab: Avoid potential double-put of maptrack entry
    (George Dunlap) 

  - gnttab: fix unmap pin accounting race (Jan Beulich)
    [Orabug: 26288557]

  - IOMMU: handle IOMMU mapping and unmapping failures (Quan
    Xu) [Orabug: 26288557]

  - xen/disk: don't leak stack data via response ring (Jan
    Beulich) 

  - BUILDINFO: xen
    commit=7b45c3eb48a884f56f072a97a9a8da4d0b1077ed

  - BUILDINFO: QEMU upstream
    commit=44c5f0a55d9a73e592426c33ce5705c969681955

  - BUILDINFO: QEMU traditional
    commit=346fdd7edd73f8287d0d0a2bab9c67b71bc6b8ba

  - BUILDINFO: IPXE
    commit=9a93db3f0947484e30e753bbd61a10b17336e20e

  - BUILDINFO: SeaBIOS
    commit=7d9cbe613694924921ed1a6f8947d711c5832eee

  - livepatch: Wrong usage of spinlock on debug console.
    (Konrad Rzeszutek Wilk) [Orabug: 26248311]

  - BUILDINFO: xen
    commit=40e21e7aea2b8bbc991346c3f516dfac4f94affe

  - BUILDINFO: QEMU upstream
    commit=44c5f0a55d9a73e592426c33ce5705c969681955

  - BUILDINFO: QEMU traditional
    commit=346fdd7edd73f8287d0d0a2bab9c67b71bc6b8ba

  - BUILDINFO: IPXE
    commit=9a93db3f0947484e30e753bbd61a10b17336e20e

  - BUILDINFO: SeaBIOS
    commit=7d9cbe613694924921ed1a6f8947d711c5832eee

  - x86/do_invalid_op should use is_active_kernel_text
    rather than having its (Konrad Rzeszutek Wilk) [Orabug:
    26129273]

  - BUILDINFO: xen
    commit=0eadc919cf32139e5565e0d869ed09f35c0a3212

  - BUILDINFO: QEMU upstream
    commit=44c5f0a55d9a73e592426c33ce5705c969681955

  - BUILDINFO: QEMU traditional
    commit=346fdd7edd73f8287d0d0a2bab9c67b71bc6b8ba

  - BUILDINFO: IPXE
    commit=9a93db3f0947484e30e753bbd61a10b17336e20e

  - BUILDINFO: SeaBIOS
    commit=7d9cbe613694924921ed1a6f8947d711c5832eee

  - kexec: Add spinlock for the whole hypercall. (Konrad
    Rzeszutek Wilk) 

  - kexec: clear kexec_image slot when unloading kexec image
    (Bhavesh Davda) [Orabug: 25861742]

  - BUILDINFO: xen
    commit=8b90d66cd941599d50ee80e14fd144e337814bf6

  - BUILDINFO: QEMU upstream
    commit=44c5f0a55d9a73e592426c33ce5705c969681955

  - BUILDINFO: QEMU traditional
    commit=346fdd7edd73f8287d0d0a2bab9c67b71bc6b8ba

  - BUILDINFO: IPXE
    commit=9a93db3f0947484e30e753bbd61a10b17336e20e

  - BUILDINFO: SeaBIOS
    commit=7d9cbe613694924921ed1a6f8947d711c5832eee

  - x86: correct create_bounce_frame (tagged with CVE
    number) (Boris Ostrovsky) [Orabug: 25927739]
    (CVE-2017-8905)

  - x86: discard type information when stealing pages
    (tagged with CVE number) (Boris Ostrovsky) [Orabug:
    25927669] (CVE-2017-8904)

  - multicall: deal with early exit conditions (tagged with
    CVE number) (Boris Ostrovsky) [Orabug: 25927592]
    (CVE-2017-8903)

  - BUILDINFO: xen
    commit=583dedab5ceddbae4d0384de0ade8feeee75f78c

  - BUILDINFO: QEMU upstream
    commit=fcd17fdf18b95a9e408acc84f6d2b37cf3fc0335

  - BUILDINFO: QEMU traditional
    commit=346fdd7edd73f8287d0d0a2bab9c67b71bc6b8ba

  - BUILDINFO: IPXE
    commit=9a93db3f0947484e30e753bbd61a10b17336e20e

  - BUILDINFO: SeaBIOS
    commit=7d9cbe613694924921ed1a6f8947d711c5832eee

  - tools/libxc: Set max_elem to zero in
    xc_lockprof_query_number (Boris Ostrovsky) [Orabug:
    26020611]"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://oss.oracle.com/pipermail/oraclevm-errata/2017-June/000744.html"
  );
  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:"2017/05/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/03");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 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-4.4.4-115", release:"OVS3.4") && rpm_check(release:"OVS3.4", reference:"xen-4.4.4-115.0.12.el6")) flag++;
if (rpm_exists(rpm:"xen-tools-4.4.4-115", release:"OVS3.4") && rpm_check(release:"OVS3.4", reference:"xen-tools-4.4.4-115.0.12.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");
}