RHEL 6 : qemu-kvm (RHSA-2018:3424)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:3424. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(118559);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/09");

  script_cve_id("CVE-2018-3639");
  script_xref(name:"RHSA", value:"2018:3424");

  script_name(english:"RHEL 6 : qemu-kvm (RHSA-2018:3424)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing a security update for qemu-kvm.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in
the RHSA-2018:3424 advisory.

    Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of
    architectures. The qemu-kvm packages provide the user-space component for running virtual machines that
    use KVM.

    Security Fix(es):

    * An industry-wide issue was found in the way many modern microprocessor designs have implemented
    speculative execution of Load & Store instructions (a commonly used performance optimization). It relies
    on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact
    that memory read from address to which a recent memory write has occurred may see an older value and
    subsequently cause an update into the microprocessor's data cache even for speculatively executed
    instructions that never actually commit (retire). As a result, an unprivileged attacker could use this
    flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639 virt-ssbd
    AMD)

    Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation.

    Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project
    Zero) for reporting this issue.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://access.redhat.com/security/data/csaf/v2/advisories/2018/rhsa-2018_3424.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ce4117f6");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/vulnerabilities/ssbd");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1566890");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2018:3424");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL qemu-kvm package based on the guidance in RHSA-2018:3424.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-3639");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_cwe_id(200);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/05/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-guest-agent");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-img");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-kvm-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:6.7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2018-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'eq', os_version: os_ver, rhel_version: '6.7')) audit(AUDIT_OS_NOT, 'Red Hat 6.7', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'repo_relative_urls': [
      'content/eus/rhel/computenode/6/6.7/x86_64/debug',
      'content/eus/rhel/computenode/6/6.7/x86_64/optional/debug',
      'content/eus/rhel/computenode/6/6.7/x86_64/optional/os',
      'content/eus/rhel/computenode/6/6.7/x86_64/optional/source/SRPMS',
      'content/eus/rhel/computenode/6/6.7/x86_64/os',
      'content/eus/rhel/computenode/6/6.7/x86_64/sfs/debug',
      'content/eus/rhel/computenode/6/6.7/x86_64/sfs/os',
      'content/eus/rhel/computenode/6/6.7/x86_64/sfs/source/SRPMS',
      'content/eus/rhel/computenode/6/6.7/x86_64/source/SRPMS',
      'content/eus/rhel/power/6/6.7/ppc64/debug',
      'content/eus/rhel/power/6/6.7/ppc64/optional/debug',
      'content/eus/rhel/power/6/6.7/ppc64/optional/os',
      'content/eus/rhel/power/6/6.7/ppc64/optional/source/SRPMS',
      'content/eus/rhel/power/6/6.7/ppc64/os',
      'content/eus/rhel/power/6/6.7/ppc64/source/SRPMS',
      'content/eus/rhel/server/6/6.7/i386/debug',
      'content/eus/rhel/server/6/6.7/i386/highavailability/debug',
      'content/eus/rhel/server/6/6.7/i386/highavailability/os',
      'content/eus/rhel/server/6/6.7/i386/highavailability/source/SRPMS',
      'content/eus/rhel/server/6/6.7/i386/loadbalancer/debug',
      'content/eus/rhel/server/6/6.7/i386/loadbalancer/os',
      'content/eus/rhel/server/6/6.7/i386/loadbalancer/source/SRPMS',
      'content/eus/rhel/server/6/6.7/i386/optional/debug',
      'content/eus/rhel/server/6/6.7/i386/optional/os',
      'content/eus/rhel/server/6/6.7/i386/optional/source/SRPMS',
      'content/eus/rhel/server/6/6.7/i386/os',
      'content/eus/rhel/server/6/6.7/i386/resilientstorage/debug',
      'content/eus/rhel/server/6/6.7/i386/resilientstorage/os',
      'content/eus/rhel/server/6/6.7/i386/resilientstorage/source/SRPMS',
      'content/eus/rhel/server/6/6.7/i386/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/debug',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/debug',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/highavailability/debug',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/highavailability/os',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/highavailability/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/os',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/scalablefilesystem/debug',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/scalablefilesystem/os',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/scalablefilesystem/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/eus-ext/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/highavailability/debug',
      'content/eus/rhel/server/6/6.7/x86_64/highavailability/os',
      'content/eus/rhel/server/6/6.7/x86_64/highavailability/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/loadbalancer/debug',
      'content/eus/rhel/server/6/6.7/x86_64/loadbalancer/os',
      'content/eus/rhel/server/6/6.7/x86_64/loadbalancer/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/optional/debug',
      'content/eus/rhel/server/6/6.7/x86_64/optional/os',
      'content/eus/rhel/server/6/6.7/x86_64/optional/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/os',
      'content/eus/rhel/server/6/6.7/x86_64/resilientstorage/debug',
      'content/eus/rhel/server/6/6.7/x86_64/resilientstorage/os',
      'content/eus/rhel/server/6/6.7/x86_64/resilientstorage/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/sap-hana/debug',
      'content/eus/rhel/server/6/6.7/x86_64/sap-hana/os',
      'content/eus/rhel/server/6/6.7/x86_64/sap-hana/source/SRPMS',
      'content/eus/rhel/server/6/6.7/x86_64/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'qemu-guest-agent-0.12.1.2-2.479.el6_7.8', 'sp':'7', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'qemu-guest-agent-0.12.1.2-2.479.el6_7.8', 'sp':'7', 'cpu':'ppc64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'qemu-guest-agent-0.12.1.2-2.479.el6_7.8', 'sp':'7', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'qemu-img-0.12.1.2-2.479.el6_7.8', 'sp':'7', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'qemu-kvm-0.12.1.2-2.479.el6_7.8', 'sp':'7', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'qemu-kvm-tools-0.12.1.2-2.479.el6_7.8', 'sp':'7', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_array['pkgs'] ) {
    var reference = NULL;
    var _release = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var epoch = NULL;
    var allowmaj = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
        rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Extended Update Support repository.\n' +
    'Access to this repository requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'qemu-guest-agent / qemu-img / qemu-kvm / qemu-kvm-tools');
}