Debian DLA-2361-1 : libx11 security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2361-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(140134);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/22");

  script_cve_id("CVE-2020-14363");
  script_xref(name:"IAVB", value:"2020-B-0051");

  script_name(english:"Debian DLA-2361-1 : libx11 security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Jayden Rivers found an integer overflow in the init_om function of
libX11, the X11 client-side library, which could lead to a double
free.

For Debian 9 stretch, this problem has been fixed in version
2:1.6.4-3+deb9u3.

We recommend that you upgrade your libx11 packages.

For the detailed security status of libx11 please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/libx11

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/2020/09/msg00000.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/libx11");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/libx11");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-14363");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-6-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-xcb-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-xcb1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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:"9.0", prefix:"libx11-6", reference:"2:1.6.4-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"libx11-6-udeb", reference:"2:1.6.4-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"libx11-data", reference:"2:1.6.4-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"libx11-dev", reference:"2:1.6.4-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"libx11-doc", reference:"2:1.6.4-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"libx11-xcb-dev", reference:"2:1.6.4-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"libx11-xcb1", reference:"2:1.6.4-3+deb9u3")) 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");