Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : ghostscript regression (USN-3866-3)

2019-02-27T00:00:00
ID UBUNTU_USN-3866-3.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-04-02T00:00:00

Description

USN-3866-2 fixed a regression in Ghostscript. The Ghostscript update introduced a new regression that resulted in certain pages being printed with a blue background. This update fixes the problem.

Original advisory details :

Tavis Ormandy discovered that Ghostscript incorrectly handled certain PostScript files. If a user or automated system were tricked into processing a specially crafted file, a remote attacker could possibly use this issue to access arbitrary files, execute arbitrary code, or cause a denial of service.

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3866-3. 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(122479);
  script_version("1.2");
  script_cvs_date("Date: 2019/09/18 12:31:49");

  script_xref(name:"USN", value:"3866-3");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : ghostscript regression (USN-3866-3)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"USN-3866-2 fixed a regression in Ghostscript. The Ghostscript update
introduced a new regression that resulted in certain pages being
printed with a blue background. This update fixes the problem.

Original advisory details :

Tavis Ormandy discovered that Ghostscript incorrectly handled certain
PostScript files. If a user or automated system were tricked into
processing a specially crafted file, a remote attacker could possibly
use this issue to access arbitrary files, execute arbitrary code, or
cause a denial of service.

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://usn.ubuntu.com/3866-3/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected ghostscript and / or libgs9 packages."
  );
  script_set_attribute(attribute:"risk_factor", value:"High");

  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:libgs9");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.10");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/02/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/02/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(14\.04|16\.04|18\.04|18\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 14.04 / 16.04 / 18.04 / 18.10", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

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

flag = 0;

if (ubuntu_check(osver:"14.04", pkgname:"ghostscript", pkgver:"9.26~dfsg+0-0ubuntu0.14.04.7")) flag++;
if (ubuntu_check(osver:"14.04", pkgname:"libgs9", pkgver:"9.26~dfsg+0-0ubuntu0.14.04.7")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"ghostscript", pkgver:"9.26~dfsg+0-0ubuntu0.16.04.7")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libgs9", pkgver:"9.26~dfsg+0-0ubuntu0.16.04.7")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"ghostscript", pkgver:"9.26~dfsg+0-0ubuntu0.18.04.7")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"libgs9", pkgver:"9.26~dfsg+0-0ubuntu0.18.04.7")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"ghostscript", pkgver:"9.26~dfsg+0-0ubuntu0.18.10.7")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"libgs9", pkgver:"9.26~dfsg+0-0ubuntu0.18.10.7")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ghostscript / libgs9");
}