Debian DLA-2627-1 : xorg-server security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2627-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include("compat.inc");

if (description)
{
  script_id(148701);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/05/24");

  script_cve_id("CVE-2021-3472");

  script_name(english:"Debian DLA-2627-1 : 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:
"Jan-Niklas Sohn discovered that there was an input validation failure
in the X.Org display server.

Insufficient checks on the lengths of the XInput extension's
ChangeFeedbackControl request could have lead to out of bounds memory
accesses in the X server. These issues can lead to privilege
escalation for authorised clients, particularly on systems where the X
server is running as a privileged user.

For Debian 9 'Stretch', this problem has been fixed in version
2:1.19.2-1+deb9u8.

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/2021/04/msg00013.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:C/I:C/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-2021-3472");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  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:"2021/04/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/04/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/16");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2021 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+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xdmx-tools", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xnest", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xorg-server-source", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-common", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xephyr", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-core", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-core-udeb", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-dev", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xserver-xorg-legacy", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xvfb", reference:"2:1.19.2-1+deb9u8")) flag++;
if (deb_check(release:"9.0", prefix:"xwayland", reference:"2:1.19.2-1+deb9u8")) flag++;

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