SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2018:0831-1) (Spectre)

2018-03-28T00:00:00
ID SUSE_SU-2018-0831-1.NASL
Type nessus
Reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-05-02T00:00:00

Description

This update for qemu fixes the following issues: This update has the next round of Spectre v2 related patches, which now integrate with corresponding changes in libvirt. (CVE-2017-5715 bsc#1068032) The January 2018 release of qemu initially addressed the Spectre v2 vulnerability for KVM guests by exposing the spec-ctrl feature for all x86 vcpu types, which was the quick and dirty approach, but not the proper solution. We replaced our initial patch by the patches from upstream. This update defines spec_ctrl and ibpb cpu feature flags as well as new cpu models which are clones of existing models with either -IBRS or -IBPB added to the end of the model name. These new vcpu models explicitly include the new feature(s), whereas the feature flags can be added to the cpu parameter as with other features. In short, for continued Spectre v2 protection, ensure that either the appropriate cpu feature flag is added to the QEMU command-line, or one of the new cpu models is used. Although migration from older versions is supported, the new cpu features won

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2018:0831-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(108686);
  script_version("1.7");
  script_cvs_date("Date: 2019/09/10 13:51:47");

  script_cve_id("CVE-2017-15119", "CVE-2017-15124", "CVE-2017-16845", "CVE-2017-17381", "CVE-2017-18030", "CVE-2017-18043", "CVE-2017-5715", "CVE-2018-5683", "CVE-2018-7550");
  script_xref(name:"IAVA", value:"2018-A-0020");

  script_name(english:"SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2018:0831-1) (Spectre)");
  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 qemu fixes the following issues: This update has the
next round of Spectre v2 related patches, which now integrate with
corresponding changes in libvirt. (CVE-2017-5715 bsc#1068032) The
January 2018 release of qemu initially addressed the Spectre v2
vulnerability for KVM guests by exposing the spec-ctrl feature for all
x86 vcpu types, which was the quick and dirty approach, but not the
proper solution. We replaced our initial patch by the patches from
upstream. This update defines spec_ctrl and ibpb cpu feature flags as
well as new cpu models which are clones of existing models with either
-IBRS or -IBPB added to the end of the model name. These new vcpu
models explicitly include the new feature(s), whereas the feature
flags can be added to the cpu parameter as with other features. In
short, for continued Spectre v2 protection, ensure that either the
appropriate cpu feature flag is added to the QEMU command-line, or one
of the new cpu models is used. Although migration from older versions
is supported, the new cpu features won't be properly exposed to the
guest until it is restarted with the cpu features explicitly added. A
reboot is insufficient. A warning patch is added which attempts to
detect a migration from a qemu version which had the quick and dirty
fix (it only detects certain cases, but hopefully is helpful.) For
additional information on Spectre v2 as it relates to QEMU, see:
https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/ A
patch is added to continue to detect Spectre v2 mitigation features
(as shown by cpuid), and if found provide that feature to guests, even
if running on older KVM (kernel) versions which do not yet expose that
feature to QEMU. (bsc#1082276) These two patches will be removed when
we can reasonably assume everyone is running with the appropriate
updates. Also security fixes for the following CVE issues are 
included :

  - CVE-2017-15119: The Network Block Device (NBD) server in
    Quick Emulator (QEMU), was vulnerable to a denial of
    service issue. It could occur if a client sent large
    option requests, making the server waste CPU time on
    reading up to 4GB per request. A client could use this
    flaw to keep the NBD server from serving other requests,
    resulting in DoS. (bsc#1070144)

  - CVE-2017-15124: VNC server implementation in Quick
    Emulator (QEMU) was found to be vulnerable to an
    unbounded memory allocation issue, as it did not
    throttle the framebuffer updates sent to its client. If
    the client did not consume these updates, VNC server
    allocates growing memory to hold onto this data. A
    malicious remote VNC client could use this flaw to cause
    DoS to the server host. (bsc#1073489)

  - CVE-2017-16845: The PS2 driver in Qemu did not validate
    'rptr' and 'count' values during guest migration,
    leading to out-of-bounds access. (bsc#1068613)

  - CVE-2017-17381: The Virtio Vring implementation in QEMU
    allowed local OS guest users to cause a denial of
    service (divide-by-zero error and QEMU process crash) by
    unsetting vring alignment while updating Virtio rings.
    (bsc#1071228)

  - CVE-2017-18030: A problem in the Cirrus driver in Qemu
    allowed local OS guest privileged users to cause a
    denial of service (out-of-bounds array access and QEMU
    process crash) via vectors related to negative pitch.
    (bsc#1076179)

  - CVE-2017-18043: Integer overflow in the macro ROUND_UP
    (n, d) in Quick Emulator (Qemu) allowed a user to cause
    a denial of service (Qemu process crash). (bsc#1076775)

  - CVE-2018-5683: The VGA driver in Qemu allowed local OS
    guest privileged users to cause a denial of service
    (out-of-bounds read and QEMU process crash) by
    leveraging improper memory address validation.
    (bsc#1076114)

  - CVE-2018-7550: The multiboot functionality in Quick
    Emulator (aka QEMU) allowed local guest OS users to
    execute arbitrary code on the QEMU host via an
    out-of-bounds read or write memory access. (bsc#1083291)
    Also the following bugs were fixed :

  - Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which
    we've carried since the initial Spectre v2 patch was
    added. EDX bit 27 of CPUID Leaf 07H, Sub-leaf 0 provides
    status on STIBP, and not the PRED_CMD MSR. Exposing the
    STIBP CPUID feature bit to the guest is wrong in
    general, since the VM doesn't directly control the
    scheduling of physical hyperthreads. This is left
    strictly to the L0 hypervisor.

  - Spectre fixes for IBM Z series by providing more hw
    features to guests (bsc#1076814)

  - Pre-add group kvm for qemu-tools (bsc#1040202)

  - the qemu-tools package also needs a prerequire of group
    management tools, from the shadow package. (bsc#1085598)

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=1040202"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1068032"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1068613"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1070144"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1071228"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073489"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1076114"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1076179"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1076775"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1076814"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1082276"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1083291"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1085598"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-15119/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-15124/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-16845/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-17381/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-18030/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-18043/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-5715/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-5683/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-7550/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20180831-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?788addb9"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server for Raspberry Pi 12-SP2:zypper in -t
patch SUSE-SLE-RPI-12-SP2-2018-555=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-2018-555=1

SUSE Linux Enterprise Desktop 12-SP2:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP2-2018-555=1"
  );
  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:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-block-curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-block-curl-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-block-rbd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-block-rbd-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-block-ssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-block-ssh-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-guest-agent");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-guest-agent-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-lang");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-s390");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-s390-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-x86");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:qemu-x86-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/03/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/28");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 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:"^(SLED12|SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED12 / SLES12", "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);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(2)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP2", os_ver + " SP" + sp);
if (os_ver == "SLED12" && (! preg(pattern:"^(2)$", string:sp))) audit(AUDIT_OS_NOT, "SLED12 SP2", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"qemu-block-rbd-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"qemu-block-rbd-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"qemu-x86-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"qemu-x86-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"s390x", reference:"qemu-s390-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"s390x", reference:"qemu-s390-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-block-curl-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-block-curl-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-block-ssh-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-block-ssh-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-debugsource-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-guest-agent-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-guest-agent-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-lang-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-tools-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-tools-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"qemu-kvm-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-block-curl-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-block-curl-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-debugsource-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-kvm-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-tools-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-tools-debuginfo-2.6.2-41.37.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"qemu-x86-2.6.2-41.37.1")) 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, "qemu");
}