CentOS 7 : gdm / libX11 / libxkbcommon / xorg-x11-drv-ati / xorg-x11-drv-vesa / etc (CESA-2019:2079)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:2079 and 
# CentOS Errata and Security Advisory 2019:2079 respectively.
#

include('compat.inc');

if (description)
{
  script_id(128349);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/30");

  script_cve_id(
    "CVE-2018-14598",
    "CVE-2018-14599",
    "CVE-2018-14600",
    "CVE-2018-15853",
    "CVE-2018-15854",
    "CVE-2018-15855",
    "CVE-2018-15856",
    "CVE-2018-15857",
    "CVE-2018-15859",
    "CVE-2018-15861",
    "CVE-2018-15862",
    "CVE-2018-15863",
    "CVE-2018-15864"
  );
  script_xref(name:"RHSA", value:"2019:2079");

  script_name(english:"CentOS 7 : gdm / libX11 / libxkbcommon / xorg-x11-drv-ati / xorg-x11-drv-vesa / etc (CESA-2019:2079)");

  script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"An update for Xorg is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

X.Org is an open source implementation of the X Window System. It
provides the basic low-level functionality that full-fledged graphical
user interfaces are designed upon.

Security Fix(es) :

* libX11: Crash on invalid reply in XListExtensions in ListExt.c
(CVE-2018-14598)

* libX11: Off-by-one error in XListExtensions in ListExt.c
(CVE-2018-14599)

* libX11: Out of Bounds write in XListExtensions in ListExt.c
(CVE-2018-14600)

* libxkbcommon: Invalid free in ExprAppendMultiKeysymList resulting in
a crash (CVE-2018-15857)

* libxkbcommon: Endless recursion in xkbcomp/expr.c resulting in a
crash (CVE-2018-15853)

* libxkbcommon: NULL pointer dereference resulting in a crash
(CVE-2018-15854)

* libxkbcommon: NULL pointer dereference when handling xkb_geometry
(CVE-2018-15855)

* libxkbcommon: Infinite loop when reaching EOL unexpectedly resulting
in a crash (CVE-2018-15856)

* libxkbcommon: NULL pointer dereference when parsing invalid atoms in
ExprResolveLhs resulting in a crash (CVE-2018-15859)

* libxkbcommon: NULL pointer dereference in ExprResolveLhs resulting
in a crash (CVE-2018-15861)

* libxkbcommon: NULL pointer dereference in LookupModMask resulting in
a crash (CVE-2018-15862)

* libxkbcommon: NULL pointer dereference in ResolveStateAndPredicate
resulting in a crash (CVE-2018-15863)

* libxkbcommon: NULL pointer dereference in resolve_keysym resulting
in a crash (CVE-2018-15864)

For more details about the security issue(s), including the impact, a
CVSS score, acknowledgments, and other related information, refer to
the CVE page(s) listed in the References section.

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.7 Release Notes linked from the References section.");
  # https://lists.centos.org/pipermail/centos-announce/2020-February/035636.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2b8a2b52");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/005880.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b275660e");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/005976.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d789b3c9");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/005977.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?77cf2be0");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/006188.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?49b31e3a");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/006189.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cca149cc");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/006190.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1da8f52b");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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-2018-14600");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/02/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gdm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gdm-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gdm-pam-extensions-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libX11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libX11-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libX11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxkbcommon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxkbcommon-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxkbcommon-x11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxkbcommon-x11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-drv-ati");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-drv-vesa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-drv-wacom");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-drv-wacom-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xdmx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xephyr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xnest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xorg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xvfb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xwayland");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-source");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gdm-3.28.2-16.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gdm-devel-3.28.2-16.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gdm-pam-extensions-devel-3.28.2-16.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libX11-1.6.7-2.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libX11-common-1.6.7-2.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libX11-devel-1.6.7-2.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxkbcommon-0.7.1-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxkbcommon-devel-0.7.1-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxkbcommon-x11-0.7.1-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxkbcommon-x11-devel-0.7.1-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-drv-ati-19.0.1-3.el7_7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-drv-vesa-2.4.0-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-drv-wacom-0.36.1-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-drv-wacom-devel-0.36.1-3.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-Xdmx-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-Xephyr-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-Xnest-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-Xorg-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-Xvfb-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-Xwayland-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-common-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-devel-1.20.4-7.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"xorg-x11-server-source-1.20.4-7.el7")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gdm / gdm-devel / gdm-pam-extensions-devel / libX11 / libX11-common / etc");
}