Ubuntu 14.04 LTS / 16.04 LTS : Ghostscript vulnerabilities (USN-3403-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3403-1. 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(102815);
  script_version("3.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2017-11714",
    "CVE-2017-9611",
    "CVE-2017-9612",
    "CVE-2017-9726",
    "CVE-2017-9727",
    "CVE-2017-9739",
    "CVE-2017-9835"
  );
  script_xref(name:"USN", value:"3403-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : Ghostscript vulnerabilities (USN-3403-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-3403-1 advisory.

    Kamil Frankowicz discovered that Ghostscript mishandles references. A remote attacker could use this to
    cause a denial of service. (CVE-2017-11714)

    Kim Gwan Yeong discovered that Ghostscript could allow a heap-based buffer over-read and application
    crash. A remote attacker could use a crafted document to cause a denial of service. (CVE-2017-9611,
    CVE-2017-9726, CVE-2017-9727, CVE-2017-9739)

    Kim Gwan Yeong discovered an use-after-free vulnerability in Ghostscript. A remote attacker could use a
    crafted file to cause a denial of service. (CVE-2017-9612)

    Kim Gwan Yeong discovered a lack of integer overflow check in Ghostscript. A remote attacker could use
    crafted PostScript document to cause a denial of service. (CVE-2017-9835)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-3403-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:N/UI:R/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-2017-9835");

  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:"2017/07/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ghostscript");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ghostscript-x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgs-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgs9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgs9-common");
  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:"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) 2017-2024 Canonical, Inc. / NASL script (C) 2017-2024 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': 'ghostscript', 'pkgver': '9.10~dfsg-0ubuntu10.10'},
    {'osver': '14.04', 'pkgname': 'ghostscript-x', 'pkgver': '9.10~dfsg-0ubuntu10.10'},
    {'osver': '14.04', 'pkgname': 'libgs-dev', 'pkgver': '9.10~dfsg-0ubuntu10.10'},
    {'osver': '14.04', 'pkgname': 'libgs9', 'pkgver': '9.10~dfsg-0ubuntu10.10'},
    {'osver': '14.04', 'pkgname': 'libgs9-common', 'pkgver': '9.10~dfsg-0ubuntu10.10'},
    {'osver': '16.04', 'pkgname': 'ghostscript', 'pkgver': '9.18~dfsg~0-0ubuntu2.7'},
    {'osver': '16.04', 'pkgname': 'ghostscript-x', 'pkgver': '9.18~dfsg~0-0ubuntu2.7'},
    {'osver': '16.04', 'pkgname': 'libgs-dev', 'pkgver': '9.18~dfsg~0-0ubuntu2.7'},
    {'osver': '16.04', 'pkgname': 'libgs9', 'pkgver': '9.18~dfsg~0-0ubuntu2.7'},
    {'osver': '16.04', 'pkgname': 'libgs9-common', 'pkgver': '9.18~dfsg~0-0ubuntu2.7'}
];

var flag = 0;
foreach var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ghostscript / ghostscript-x / libgs-dev / libgs9 / libgs9-common');
}