Debian DLA-2359-1 : xorg-server security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2359-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(140058);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/09/17");

  script_cve_id("CVE-2020-14345", "CVE-2020-14346", "CVE-2020-14347", "CVE-2020-14361", "CVE-2020-14362");

  script_name(english:"Debian DLA-2359-1 : xorg-server security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Several issues have been found in xorg-server, the X server from xorg.
Basically all issues are out-of-bounds access or integer underflows in
different request handlers. One CVE is about a leak of uninitialize
heap memory to clients.

For Debian 9 stretch, these problems have been fixed in version
2:1.19.2-1+deb9u6.

We recommend that you upgrade your xorg-server packages.

For the detailed security status of xorg-server please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/xorg-server

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA 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://lists.debian.org/debian-lts-announce/2020/08/msg00057.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/xorg-server"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/xorg-server"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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-2020-14362");
  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:xdmx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xdmx-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xnest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xorg-server-source");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xephyr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-core-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-legacy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xvfb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xwayland");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/08/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/08/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/31");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 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:"xdmx", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xdmx-tools", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xnest", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xorg-server-source", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-common", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xephyr", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-core", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-core-udeb", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-dev", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-legacy", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xvfb", reference:"2:1.19.2-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"xwayland", reference:"2:1.19.2-1+deb9u6")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");