Ubuntu 14.04 LTS : Ruby vulnerabilities (USN-2397-1)

#%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-2397-1. 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(78869);
  script_version("1.14");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/23");

  script_cve_id("CVE-2014-4975", "CVE-2014-8080");
  script_xref(name:"USN", value:"2397-1");

  script_name(english:"Ubuntu 14.04 LTS : Ruby vulnerabilities (USN-2397-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Will Wood discovered that Ruby incorrectly handled the encodes()
function. An attacker could possibly use this issue to cause Ruby to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce
the vulnerability to a denial of service. (CVE-2014-4975)

Willis Vandevanter discovered that Ruby incorrectly handled XML entity
expansion. An attacker could use this flaw to cause Ruby to consume
large amounts of resources, resulting in a denial of service.
(CVE-2014-8080).

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://ubuntu.com/security/notices/USN-2397-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-4975");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2014-8080");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2014/11/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2014/11/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/11/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libruby1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libruby2.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libtcltk-ruby1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ri1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby1.9.1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby1.9.1-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby1.9.1-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby1.9.3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby2.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby2.0-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby2.0-tcltk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2014-2020 Canonical, Inc. / NASL script (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'libruby1.9.1', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'libruby2.0', 'pkgver': '2.0.0.484-1ubuntu2.1'},
    {'osver': '14.04', 'pkgname': 'libtcltk-ruby1.9.1', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ri1.9.1', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ruby1.9.1', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ruby1.9.1-dev', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ruby1.9.1-examples', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ruby1.9.1-full', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ruby1.9.3', 'pkgver': '1.9.3.484-2ubuntu1.1'},
    {'osver': '14.04', 'pkgname': 'ruby2.0', 'pkgver': '2.0.0.484-1ubuntu2.1'},
    {'osver': '14.04', 'pkgname': 'ruby2.0-dev', 'pkgver': '2.0.0.484-1ubuntu2.1'},
    {'osver': '14.04', 'pkgname': 'ruby2.0-tcltk', 'pkgver': '2.0.0.484-1ubuntu2.1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libruby1.9.1 / libruby2.0 / libtcltk-ruby1.9.1 / ri1.9.1 / etc');
}