Ubuntu 14.04 LTS / 16.04 LTS : GD library vulnerabilities (USN-3117-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3117-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(94466);
  script_version("2.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2016-6911", "CVE-2016-7568", "CVE-2016-8670");
  script_xref(name:"USN", value:"3117-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : GD library vulnerabilities (USN-3117-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Ibrahim El-Sayed discovered that the GD library incorrectly handled
certain malformed Tiff images. If a user or automated system were
tricked into processing a specially crafted Tiff image, an attacker
could cause a denial of service. (CVE-2016-6911)

Ke Liu discovered that the GD library incorrectly handled certain
integers when processing WebP images. If a user or automated system
were tricked into processing a specially crafted WebP image, an
attacker could cause a denial of service, or possibly execute
arbitrary code. This issue only applied to Ubuntu 14.04 LTS, Ubuntu
16.04 LTS and Ubuntu 16.10. (CVE-2016-7568)

Emmanuel Law discovered that the GD library incorrectly handled
certain strings when creating images. If a user or automated system
were tricked into processing a specially crafted image, an attacker
could cause a denial of service, or possibly execute arbitrary code.
(CVE-2016-8670).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-3117-1");
  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-2016-8670");

  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:"2016/09/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/11/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgd2-noxpm-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgd2-xpm-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgd3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgd-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgd-tools");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2016-2023 Canonical, Inc. / NASL script (C) 2016-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'libgd-dev', 'pkgver': '2.1.0-3ubuntu0.5'},
    {'osver': '14.04', 'pkgname': 'libgd-tools', 'pkgver': '2.1.0-3ubuntu0.5'},
    {'osver': '14.04', 'pkgname': 'libgd2-noxpm-dev', 'pkgver': '2.1.0-3ubuntu0.5'},
    {'osver': '14.04', 'pkgname': 'libgd2-xpm-dev', 'pkgver': '2.1.0-3ubuntu0.5'},
    {'osver': '14.04', 'pkgname': 'libgd3', 'pkgver': '2.1.0-3ubuntu0.5'},
    {'osver': '16.04', 'pkgname': 'libgd-dev', 'pkgver': '2.1.1-4ubuntu0.16.04.5'},
    {'osver': '16.04', 'pkgname': 'libgd-tools', 'pkgver': '2.1.1-4ubuntu0.16.04.5'},
    {'osver': '16.04', 'pkgname': 'libgd3', 'pkgver': '2.1.1-4ubuntu0.16.04.5'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libgd-dev / libgd-tools / libgd2-noxpm-dev / libgd2-xpm-dev / etc');
}