Ubuntu 6.06 LTS / 7.04 / 7.10 / 8.04 LTS : libxml2 vulnerability (USN-640-1)

2008-09-05T00:00:00
ID UBUNTU_USN-640-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2008-2019 Canonical, Inc. / NASL script (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2021-01-19T00:00:00

Description

Andreas Solberg discovered that libxml2 did not handle recursive entities safely. If an application linked against libxml2 were made to process a specially crafted XML document, a remote attacker could exhaust the system's CPU resources, leading to 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.

                                        
                                            #%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-640-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(34094);
  script_version("1.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id("CVE-2008-3281");
  script_bugtraq_id(30783);
  script_xref(name:"USN", value:"640-1");

  script_name(english:"Ubuntu 6.06 LTS / 7.04 / 7.10 / 8.04 LTS : libxml2 vulnerability (USN-640-1)");
  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:
"Andreas Solberg discovered that libxml2 did not handle recursive
entities safely. If an application linked against libxml2 were made to
process a specially crafted XML document, a remote attacker could
exhaust the system's CPU resources, leading to 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/640-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:ND/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_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:7.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:7.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:8.04:-:lts");

  script_set_attribute(attribute:"patch_publication_date", value:"2008/09/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2008/09/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2008-2019 Canonical, Inc. / NASL script (C) 2018 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 (! ereg(pattern:"^(6\.06|7\.04|7\.10|8\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 6.06 / 7.04 / 7.10 / 8.04", "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-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-dbg", pkgver:"2.6.24.dfsg-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-dev", pkgver:"2.6.24.dfsg-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-doc", pkgver:"2.6.24.dfsg-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libxml2-utils", pkgver:"2.6.24.dfsg-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"python-libxml2", pkgver:"2.6.24.dfsg-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"python2.4-libxml2", pkgver:"2.6.24.dfsg-1ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-dbg", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-dev", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-doc", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"libxml2-utils", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"python-libxml2", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"python-libxml2-dbg", pkgver:"2.6.27.dfsg-1ubuntu3.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-dbg", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-dev", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-doc", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"libxml2-utils", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"python-libxml2", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"python-libxml2-dbg", pkgver:"2.6.30.dfsg-2ubuntu1.2")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"libxml2", pkgver:"2.6.31.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"libxml2-dbg", pkgver:"2.6.31.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"libxml2-dev", pkgver:"2.6.31.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"libxml2-doc", pkgver:"2.6.31.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"libxml2-utils", pkgver:"2.6.31.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"python-libxml2", pkgver:"2.6.31.dfsg-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"8.04", pkgname:"python-libxml2-dbg", pkgver:"2.6.31.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");
}