Debian DSA-4803-1 : xorg-server - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4803. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(143505);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/06");

  script_cve_id("CVE-2020-14360", "CVE-2020-25712");
  script_xref(name:"DSA", value:"4803");

  script_name(english:"Debian DSA-4803-1 : xorg-server - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"Jan-Niklas Sohn discovered that the XKB extension of the Xorg X server
performed incomplete input validation, which could result in privilege
escalation.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/xorg-server");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/xorg-server");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2020/dsa-4803");
  script_set_attribute(attribute:"solution", value:
"Upgrade the xorg-server packages.

For the stable distribution (buster), these problems have been fixed
in version 2:1.20.4-1+deb10u2.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/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: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-2020-14360");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-25712");

  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:"2020/12/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/12/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/12/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xorg-server");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/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:"10.0", prefix:"xdmx", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xdmx-tools", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xnest", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xorg-server-source", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xserver-common", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xserver-xephyr", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xserver-xorg-core", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xserver-xorg-core-udeb", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xserver-xorg-dev", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xserver-xorg-legacy", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xvfb", reference:"2:1.20.4-1+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"xwayland", reference:"2:1.20.4-1+deb10u2")) 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");