Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : PolicyKit vulnerabilities (USN-3717-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3717-1. 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(111135);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id(
    "CVE-2015-3218",
    "CVE-2015-3255",
    "CVE-2015-4625",
    "CVE-2018-1116"
  );
  script_xref(name:"USN", value:"3717-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : PolicyKit vulnerabilities (USN-3717-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Tavis Ormandy discovered that PolicyKit incorrectly handled certain
invalid object paths. A local attacker could possibly use this issue
to cause PolicyKit to crash, resulting in a denial of service. This
issue only affected Ubuntu 14.04 LTS. (CVE-2015-3218)

It was discovered that PolicyKit incorrectly handled certain duplicate
action IDs. A local attacker could use this issue to cause PolicyKit
to crash, resulting in a denial of service, or possibly escalate
privileges. This issue only affected Ubuntu 14.04 LTS. (CVE-2015-3255)

Tavis Ormandy discovered that PolicyKit incorrectly handled duplicate
cookie values. A local attacker could use this issue to cause
PolicyKit to crash, resulting in a denial of service, or possibly
escalate privileges. This issue only affected Ubuntu 14.04 LTS.
(CVE-2015-4625)

Matthias Gerstner discovered that PolicyKit incorrectly checked users.
A local attacker could possibly use this issue to cause authentication
dialogs to show up for other users, leading to a denial of service or
an information leak. (CVE-2018-1116).

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-3717-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-4625");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-1116");

  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:"2015/10/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/07/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/07/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-backend-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-backend-1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-gobject-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-gobject-1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:policykit-1");
  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:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gir1.2-polkit-1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-agent-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-agent-1-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) 2018-2023 Canonical, Inc. / NASL script (C) 2018-2023 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 || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04', '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': 'gir1.2-polkit-1.0', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'libpolkit-agent-1-0', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'libpolkit-agent-1-dev', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'libpolkit-backend-1-0', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'libpolkit-backend-1-dev', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'libpolkit-gobject-1-0', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'libpolkit-gobject-1-dev', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '14.04', 'pkgname': 'policykit-1', 'pkgver': '0.105-4ubuntu3.14.04.2'},
    {'osver': '16.04', 'pkgname': 'gir1.2-polkit-1.0', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'libpolkit-agent-1-0', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'libpolkit-agent-1-dev', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'libpolkit-backend-1-0', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'libpolkit-backend-1-dev', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'libpolkit-gobject-1-0', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'libpolkit-gobject-1-dev', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'policykit-1', 'pkgver': '0.105-14.1ubuntu0.1'},
    {'osver': '18.04', 'pkgname': 'gir1.2-polkit-1.0', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpolkit-agent-1-0', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpolkit-agent-1-dev', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpolkit-backend-1-0', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpolkit-backend-1-dev', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpolkit-gobject-1-0', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpolkit-gobject-1-dev', 'pkgver': '0.105-20ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'policykit-1', 'pkgver': '0.105-20ubuntu0.18.04.1'}
];

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, 'gir1.2-polkit-1.0 / libpolkit-agent-1-0 / libpolkit-agent-1-dev / etc');
}