Ubuntu 14.04 LTS / 16.04 LTS : OpenSSL regression (USN-3087-2)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3087-2. 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(93715);
  script_version("2.14");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");
  script_xref(name:"USN", value:"3087-2");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : OpenSSL regression (USN-3087-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced
in the USN-3087-2 advisory.

    USN-3087-1 fixed vulnerabilities in OpenSSL. The fix for CVE-2016-2182 was incomplete and caused a
    regression when parsing certificates. This update fixes the problem.

    We apologize for the inconvenience.

    Original advisory details:

    Shi Lei discovered that OpenSSL incorrectly handled the OCSP Status Request

    extension. A remote attacker could possibly use this issue to cause memory

    consumption, resulting in a denial of service. (CVE-2016-6304)

    Guido Vranken discovered that OpenSSL used undefined behaviour when

    performing pointer arithmetic. A remote attacker could possibly use this

    issue to cause OpenSSL to crash, resulting in a denial of service. This

    issue has only been addressed in Ubuntu 16.04 LTS in this update.

    (CVE-2016-2177)

    Csar Pereida, Billy Brumley, and Yuval Yarom discovered that OpenSSL

    did not properly use constant-time operations when performing DSA signing.

    A remote attacker could possibly use this issue to perform a cache-timing

    attack and recover private DSA keys. (CVE-2016-2178)

    Quan Luo discovered that OpenSSL did not properly restrict the lifetime

    of queue entries in the DTLS implementation. A remote attacker could

    possibly use this issue to consume memory, resulting in a denial of

    service. (CVE-2016-2179)

    Shi Lei discovered that OpenSSL incorrectly handled memory in the

    TS_OBJ_print_bio() function. A remote attacker could possibly use this

    issue to cause a denial of service. (CVE-2016-2180)

    It was discovered that the OpenSSL incorrectly handled the DTLS anti-replay

    feature. A remote attacker could possibly use this issue to cause a denial

    of service. (CVE-2016-2181)

    Shi Lei discovered that OpenSSL incorrectly validated division results. A

    remote attacker could possibly use this issue to cause a denial of service.

    (CVE-2016-2182)

    Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple DES

    ciphers were vulnerable to birthday attacks. A remote attacker could

    possibly use this flaw to obtain clear text data from long encrypted

    sessions. This update moves DES from the HIGH cipher list to MEDIUM.

    (CVE-2016-2183)

    Shi Lei discovered that OpenSSL incorrectly handled certain ticket lengths.

    A remote attacker could use this issue to cause a denial of service.

    (CVE-2016-6302)

    Shi Lei discovered that OpenSSL incorrectly handled memory in the

    MDC2_Update() function. A remote attacker could possibly use this issue to

    cause a denial of service. (CVE-2016-6303)

    Shi Lei discovered that OpenSSL incorrectly performed certain message

    length checks. A remote attacker could possibly use this issue to cause a

    denial of service. (CVE-2016-6306)

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

Note that Nessus has not tested for this issue 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-3087-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_attribute(attribute:"risk_factor", value:"High");

  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:"2016/06/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl1.0.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl1.0.0-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssl");
  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:libcrypto1.0.0-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl-dev");
  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) 2016-2024 Canonical, Inc. / NASL script (C) 2016-2024 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': 'libcrypto1.0.0-udeb', 'pkgver': '1.0.1f-1ubuntu2.21'},
    {'osver': '14.04', 'pkgname': 'libssl-dev', 'pkgver': '1.0.1f-1ubuntu2.21'},
    {'osver': '14.04', 'pkgname': 'libssl1.0.0', 'pkgver': '1.0.1f-1ubuntu2.21'},
    {'osver': '14.04', 'pkgname': 'libssl1.0.0-udeb', 'pkgver': '1.0.1f-1ubuntu2.21'},
    {'osver': '14.04', 'pkgname': 'openssl', 'pkgver': '1.0.1f-1ubuntu2.21'},
    {'osver': '16.04', 'pkgname': 'libcrypto1.0.0-udeb', 'pkgver': '1.0.2g-1ubuntu4.5'},
    {'osver': '16.04', 'pkgname': 'libssl-dev', 'pkgver': '1.0.2g-1ubuntu4.5'},
    {'osver': '16.04', 'pkgname': 'libssl1.0.0', 'pkgver': '1.0.2g-1ubuntu4.5'},
    {'osver': '16.04', 'pkgname': 'libssl1.0.0-udeb', 'pkgver': '1.0.2g-1ubuntu4.5'},
    {'osver': '16.04', 'pkgname': 'openssl', 'pkgver': '1.0.2g-1ubuntu4.5'}
];

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, 'libcrypto1.0.0-udeb / libssl-dev / libssl1.0.0 / libssl1.0.0-udeb / etc');
}