Ubuntu 14.04 LTS / 16.04 LTS : NSS vulnerabilities (USN-3163-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3163-1. 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(96304);
  script_version("3.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2016-5285", "CVE-2016-8635", "CVE-2016-9074");
  script_xref(name:"USN", value:"3163-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : NSS vulnerabilities (USN-3163-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"It was discovered that NSS incorrectly handled certain invalid
Diffie-Hellman keys. A remote attacker could possibly use this flaw to
cause NSS to crash, resulting in a denial of service. This issue only
applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-5285)

Hubert Kario discovered that NSS incorrectly handled Diffie Hellman
client key exchanges. A remote attacker could possibly use this flaw
to perform a small subgroup confinement attack and recover private
keys. This issue only applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS
and Ubuntu 16.04 LTS. (CVE-2016-8635)

Franziskus Kiefer discovered that NSS incorrectly mitigated certain
timing side-channel attacks. A remote attacker could possibly use this
flaw to recover private keys. (CVE-2016-9074)

This update refreshes the NSS package to version 3.26.2 which includes
the latest CA certificate bundle.

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-3163-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-9074");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-1d");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-nssdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-tools");
  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:"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) 2017-2023 Canonical, Inc. / NASL script (C) 2017-2023 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': 'libnss3', 'pkgver': '2:3.26.2-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libnss3-1d', 'pkgver': '2:3.26.2-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.26.2-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libnss3-nssdb', 'pkgver': '2:3.26.2-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.26.2-0ubuntu0.14.04.3'},
    {'osver': '16.04', 'pkgname': 'libnss3', 'pkgver': '2:3.26.2-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libnss3-1d', 'pkgver': '2:3.26.2-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.26.2-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libnss3-nssdb', 'pkgver': '2:3.26.2-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.26.2-0ubuntu0.16.04.2'}
];

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, 'libnss3 / libnss3-1d / libnss3-dev / libnss3-nssdb / libnss3-tools');
}