Ubuntu 10.04 LTS / 10.10 / 11.04 / 11.10 : xorg-server vulnerabilities (USN-1232-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-1232-1. 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(56555);
  script_version("1.10");
  script_cvs_date("Date: 2019/09/19 12:54:27");

  script_cve_id("CVE-2010-4818", "CVE-2010-4819", "CVE-2011-4028", "CVE-2011-4029");
  script_bugtraq_id(50002);
  script_xref(name:"USN", value:"1232-1");

  script_name(english:"Ubuntu 10.04 LTS / 10.10 / 11.04 / 11.10 : xorg-server vulnerabilities (USN-1232-1)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that the X server incorrectly handled certain
malformed input. An authorized attacker could exploit this to cause
the X server to crash, leading to a denial or service, or possibly
execute arbitrary code with root privileges. This issue only affected
Ubuntu 10.04 LTS and 10.10. (CVE-2010-4818)

It was discovered that the X server incorrectly handled certain
malformed input. An authorized attacker could exploit this to cause
the X server to crash, leading to a denial or service, or possibly
read arbitrary data from the X server process. This issue only
affected Ubuntu 10.04 LTS. (CVE-2010-4819)

Vladz discovered that the X server incorrectly handled lock files. A
local attacker could use this flaw to determine if a file existed or
not. (CVE-2011-4028)

Vladz discovered that the X server incorrectly handled setting lock
file permissions. A local attacker could use this flaw to gain read
permissions on arbitrary files and view sensitive information.
(CVE-2011-4029).

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/1232-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected xserver-xorg-core package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.10");

  script_set_attribute(attribute:"vuln_publication_date", value:"2012/07/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/10/19");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2011-2019 Canonical, Inc. / NASL script (C) 2011-2019 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:"^(10\.04|10\.10|11\.04|11\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 10.04 / 10.10 / 11.04 / 11.10", "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:"10.04", pkgname:"xserver-xorg-core", pkgver:"2:1.7.6-2ubuntu7.8")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"xserver-xorg-core", pkgver:"2:1.9.0-0ubuntu7.5")) flag++;
if (ubuntu_check(osver:"11.04", pkgname:"xserver-xorg-core", pkgver:"2:1.10.1-1ubuntu1.3")) flag++;
if (ubuntu_check(osver:"11.10", pkgname:"xserver-xorg-core", pkgver:"2:1.10.4-1ubuntu4.1")) 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, "xserver-xorg-core");
}