Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : pyopenssl vulnerability (USN-1965-1)

2013-09-24T00:00:00
ID UBUNTU_USN-1965-1.NASL
Type nessus
Reporter Tenable
Modified 2018-12-01T00:00:00

Description

It was discovered that pyOpenSSL did not properly handle certificates with NULL characters in the Subject Alternative Name field. An attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications.

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-1965-1. 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(70087);
  script_version("1.8");
  script_cvs_date("Date: 2018/12/01 13:19:08");

  script_cve_id("CVE-2013-4314");
  script_bugtraq_id(62258);
  script_xref(name:"USN", value:"1965-1");

  script_name(english:"Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : pyopenssl vulnerability (USN-1965-1)");
  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:
"It was discovered that pyOpenSSL did not properly handle certificates
with NULL characters in the Subject Alternative Name field. An
attacker could exploit this to perform a man in the middle attack to
view sensitive information or alter encrypted communications.

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/1965-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected python-openssl and / or python3-openssl packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
  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:python-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-openssl");
  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:12.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:12.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:13.04");

  script_set_attribute(attribute:"patch_publication_date", value:"2013/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/09/24");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2013-2018 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:"^(10\.04|12\.04|12\.10|13\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 10.04 / 12.04 / 12.10 / 13.04", "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:"10.04", pkgname:"python-openssl", pkgver:"0.10-1ubuntu0.1")) flag++;
if (ubuntu_check(osver:"12.04", pkgname:"python-openssl", pkgver:"0.12-1ubuntu2.1")) flag++;
if (ubuntu_check(osver:"12.10", pkgname:"python-openssl", pkgver:"0.13-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"12.10", pkgname:"python3-openssl", pkgver:"0.13-2ubuntu1.1")) flag++;
if (ubuntu_check(osver:"13.04", pkgname:"python-openssl", pkgver:"0.13-2ubuntu3.1")) flag++;
if (ubuntu_check(osver:"13.04", pkgname:"python3-openssl", pkgver:"0.13-2ubuntu3.1")) 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, "python-openssl / python3-openssl");
}