Ubuntu 6.06 LTS / 6.10 / 7.04 / 7.10 : libxml2 vulnerability (USN-569-1)

2008-01-15T00:00:00
ID UBUNTU_USN-569-1.NASL
Type nessus
Reporter Tenable
Modified 2016-05-27T00:00:00

Description

Brad Fitzpatrick discovered that libxml2 did not correctly handle certain UTF-8 sequences. If a remote attacker were able to trick a user or automated system into processing a specially crafted XML document, the application linked against libxml2 could enter an infinite loop, leading to a denial of service via CPU resource consumption.

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-569-1. 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(29979);
  script_version("$Revision: 1.11 $");
  script_cvs_date("$Date: 2016/05/27 14:29:18 $");

  script_cve_id("CVE-2007-6284");
  script_xref(name:"USN", value:"569-1");

  script_name(english:"Ubuntu 6.06 LTS / 6.10 / 7.04 / 7.10 : libxml2 vulnerability (USN-569-1)");
  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:
"Brad Fitzpatrick discovered that libxml2 did not correctly handle
certain UTF-8 sequences. If a remote attacker were able to trick a
user or automated system into processing a specially crafted XML
document, the application linked against libxml2 could enter an
infinite loop, leading to a denial of service via CPU resource
consumption.

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:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cwe_id(399);

  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:"p-cpe:/a:canonical:ubuntu_linux:libxml2-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-libxml2-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python2.4-libxml2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:6.06:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:6.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:7.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:7.10");

  script_set_attribute(attribute:"patch_publication_date", value:"2008/01/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2008/01/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2008-2016 Canonical, Inc. / NASL script (C) 2008-2016 Tenable Network Security, Inc.");
  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 (! ereg(pattern:"^(6\.06|6\.10|7\.04|7\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 6.06 / 6.10 / 7.04 / 7.10", "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:"6.06", pkgname:"libxml2", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-dbg", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-dev", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-doc", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-utils", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"python-libxml2", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"python2.4-libxml2", pkgver:"2.6.24.dfsg-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"libxml2", pkgver:"2.6.26.dfsg-2ubuntu4.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"libxml2-dbg", pkgver:"2.6.26.dfsg-2ubuntu4.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"libxml2-dev", pkgver:"2.6.26.dfsg-2ubuntu4.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"libxml2-doc", pkgver:"2.6.26.dfsg-2ubuntu4.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"libxml2-utils", pkgver:"2.6.26.dfsg-2ubuntu4.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"python-libxml2", pkgver:"2.6.26.dfsg-2ubuntu4.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-dbg", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-dev", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-doc", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-utils", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"python-libxml2", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"python-libxml2-dbg", pkgver:"2.6.27.dfsg-1ubuntu3.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-dbg", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-dev", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-doc", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-utils", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"python-libxml2", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"python-libxml2-dbg", pkgver:"2.6.30.dfsg-2ubuntu1.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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 / libxml2-dbg / libxml2-dev / libxml2-doc / libxml2-utils / etc");
}