Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : gnupg, libgcrypt11 vulnerability (USN-1923-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-1923-1. 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(69175);
  script_version("1.11");
  script_cvs_date("Date: 2019/09/19 12:54:29");

  script_cve_id("CVE-2013-4242");
  script_bugtraq_id(61464);
  script_xref(name:"USN", value:"1923-1");

  script_name(english:"Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : gnupg, libgcrypt11 vulnerability (USN-1923-1)");
  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:
"Yuval Yarom and Katrina Falkner discovered a timing-based information
leak, known as Flush+Reload, that could be used to trace execution in
programs. GnuPG and Libgcrypt followed different execution paths based
on key-related data, which could be used to expose the contents of
private keys.

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/1923-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected gnupg and / or libgcrypt11 packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/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:gnupg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgcrypt11");
  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:"vuln_publication_date", value:"2013/08/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/07/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/08/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2013-2019 Canonical, Inc. / NASL script (C) 2013-2019 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|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:"gnupg", pkgver:"1.4.10-2ubuntu1.3")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"libgcrypt11", pkgver:"1.4.4-5ubuntu2.2")) flag++;
if (ubuntu_check(osver:"12.04", pkgname:"gnupg", pkgver:"1.4.11-3ubuntu2.3")) flag++;
if (ubuntu_check(osver:"12.04", pkgname:"libgcrypt11", pkgver:"1.5.0-3ubuntu0.2")) flag++;
if (ubuntu_check(osver:"12.10", pkgname:"gnupg", pkgver:"1.4.11-3ubuntu4.2")) flag++;
if (ubuntu_check(osver:"12.10", pkgname:"libgcrypt11", pkgver:"1.5.0-3ubuntu1.1")) flag++;
if (ubuntu_check(osver:"13.04", pkgname:"gnupg", pkgver:"1.4.12-7ubuntu1.1")) flag++;
if (ubuntu_check(osver:"13.04", pkgname:"libgcrypt11", pkgver:"1.5.0-3ubuntu2.2")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    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, "gnupg / libgcrypt11");
}