Ubuntu 14.04 LTS / 16.04 LTS : GnuTLS vulnerabilities (USN-3183-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3183-1. 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(96952);
  script_version("3.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2016-7444",
    "CVE-2016-8610",
    "CVE-2017-5334",
    "CVE-2017-5335",
    "CVE-2017-5336",
    "CVE-2017-5337"
  );
  script_xref(name:"USN", value:"3183-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : GnuTLS vulnerabilities (USN-3183-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-3183-1 advisory.

    Stefan Buehler discovered that GnuTLS incorrectly verified the serial length of OCSP responses. A remote
    attacker could possibly use this issue to bypass certain certificate validation measures. This issue only
    applied to Ubuntu 16.04 LTS. (CVE-2016-7444)

    Shi Lei discovered that GnuTLS incorrectly handled certain warning alerts. A remote attacker could
    possibly use this issue to cause GnuTLS to hang, resulting in a denial of service. This issue has only
    been addressed in Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-8610)

    It was discovered that GnuTLS incorrectly decoded X.509 certificates with a Proxy Certificate Information
    extension. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of
    service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10.
    (CVE-2017-5334)

    It was discovered that GnuTLS incorrectly handled certain OpenPGP certificates. A remote attacker could
    possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute
    arbitrary code. (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-3183-1");
  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:P/A:P");
  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:H/I:H/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-2017-5337");

  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:"2016/09/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/02/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/02/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls26");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls28-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls30");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutlsxx27");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutlsxx28");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnutls-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:guile-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls-openssl27");
  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) 2017-2024 Canonical, Inc. / NASL script (C) 2017-2024 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 || '16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04', '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': 'gnutls-bin', 'pkgver': '3.0.11+really2.12.23-12ubuntu2.6'},
    {'osver': '14.04', 'pkgname': 'libgnutls-dev', 'pkgver': '2.12.23-12ubuntu2.6'},
    {'osver': '14.04', 'pkgname': 'libgnutls-openssl27', 'pkgver': '2.12.23-12ubuntu2.6'},
    {'osver': '14.04', 'pkgname': 'libgnutls26', 'pkgver': '2.12.23-12ubuntu2.6'},
    {'osver': '14.04', 'pkgname': 'libgnutlsxx27', 'pkgver': '2.12.23-12ubuntu2.6'},
    {'osver': '16.04', 'pkgname': 'gnutls-bin', 'pkgver': '3.4.10-4ubuntu1.2'},
    {'osver': '16.04', 'pkgname': 'guile-gnutls', 'pkgver': '3.4.10-4ubuntu1.2'},
    {'osver': '16.04', 'pkgname': 'libgnutls-dev', 'pkgver': '3.4.10-4ubuntu1.2'},
    {'osver': '16.04', 'pkgname': 'libgnutls-openssl27', 'pkgver': '3.4.10-4ubuntu1.2'},
    {'osver': '16.04', 'pkgname': 'libgnutls28-dev', 'pkgver': '3.4.10-4ubuntu1.2'},
    {'osver': '16.04', 'pkgname': 'libgnutls30', 'pkgver': '3.4.10-4ubuntu1.2'},
    {'osver': '16.04', 'pkgname': 'libgnutlsxx28', 'pkgver': '3.4.10-4ubuntu1.2'}
];

var flag = 0;
foreach var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'gnutls-bin / guile-gnutls / libgnutls-dev / libgnutls-openssl27 / etc');
}