Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : libxml2 vulnerabilities (USN-1334-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-1334-1. 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(57615);
  script_version("1.11");
  script_cvs_date("Date: 2019/09/19 12:54:27");

  script_cve_id("CVE-2011-0216", "CVE-2011-2821", "CVE-2011-2834", "CVE-2011-3905", "CVE-2011-3919");
  script_bugtraq_id(48832, 49279, 49658, 51084, 51300);
  script_xref(name:"USN", value:"1334-1");

  script_name(english:"Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : libxml2 vulnerabilities (USN-1334-1)");
  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 libxml2 contained an off by one error. If a
user or application linked against libxml2 were tricked into opening a
specially crafted XML file, an attacker could cause the application to
crash or possibly execute arbitrary code with the privileges of the
user invoking the program. (CVE-2011-0216)

It was discovered that libxml2 is vulnerable to double-free conditions
when parsing certain XML documents. This could allow a remote attacker
to cause a denial of service. (CVE-2011-2821, CVE-2011-2834)

It was discovered that libxml2 did not properly detect end of file
when parsing certain XML documents. An attacker could exploit this to
crash applications linked against libxml2. (CVE-2011-3905)

It was discovered that libxml2 did not properly decode entity
references with long names. If a user or application linked against
libxml2 were tricked into opening a specially crafted XML file, an
attacker could cause the application to crash or possibly execute
arbitrary code with the privileges of the user invoking the program.
(CVE-2011-3919).

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/1334-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libxml2 package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2");
  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:"cpe", value:"cpe:/o:canonical:ubuntu_linux:8.04:-:lts");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2012/01/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/01/20");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2012-2019 Canonical, Inc. / NASL script (C) 2012-2019 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:"^(8\.04|10\.04|10\.10|11\.04|11\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 8.04 / 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:"8.04", pkgname:"libxml2", pkgver:"2.6.31.dfsg-2ubuntu1.7")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"libxml2", pkgver:"2.7.6.dfsg-1ubuntu1.3")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"libxml2", pkgver:"2.7.7.dfsg-4ubuntu0.3")) flag++;
if (ubuntu_check(osver:"11.04", pkgname:"libxml2", pkgver:"2.7.8.dfsg-2ubuntu0.2")) flag++;
if (ubuntu_check(osver:"11.10", pkgname:"libxml2", pkgver:"2.7.8.dfsg-4ubuntu0.1")) 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, "libxml2");
}