Ubuntu 16.04 LTS / 18.04 LTS : CUPS vulnerabilities (USN-4105-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4105-1. 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(128031);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id("CVE-2019-8675", "CVE-2019-8696");
  script_xref(name:"USN", value:"4105-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : CUPS vulnerabilities (USN-4105-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Stephan Zeisberg discovered that the CUPS SNMP backend incorrectly
handled encoded ASN.1 inputs. A remote attacker could possibly use
this issue to cause CUPS to crash by providing specially crafted
network traffic. (CVE-2019-8696, CVE-2019-8675)

It was discovered that CUPS did not properly handle client
disconnection events. A local attacker could possibly use this issue
to cause a denial of service or disclose memory from the CUPS server.

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-4105-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-8696");

  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:"2020/10/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-bsd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-core-drivers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-daemon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-ipp-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-ppdc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcups2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcups2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupscgi1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupscgi1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsimage2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsimage2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsmime1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsmime1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsppdc1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsppdc1-dev");
  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:"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) 2019-2023 Canonical, Inc. / NASL script (C) 2019-2023 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 (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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': '16.04', 'pkgname': 'cups', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-bsd', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-client', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-common', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-core-drivers', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-daemon', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-ipp-utils', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-ppdc', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'cups-server-common', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcups2', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcups2-dev', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupscgi1', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupscgi1-dev', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupsimage2', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupsimage2-dev', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupsmime1', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupsmime1-dev', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupsppdc1', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '16.04', 'pkgname': 'libcupsppdc1-dev', 'pkgver': '2.1.3-4ubuntu0.10'},
    {'osver': '18.04', 'pkgname': 'cups', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-bsd', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-client', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-common', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-core-drivers', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-daemon', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-ipp-utils', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-ppdc', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'cups-server-common', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcups2', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcups2-dev', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcupscgi1', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcupsimage2', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcupsimage2-dev', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcupsmime1', 'pkgver': '2.2.7-1ubuntu2.7'},
    {'osver': '18.04', 'pkgname': 'libcupsppdc1', 'pkgver': '2.2.7-1ubuntu2.7'}
];

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, 'cups / cups-bsd / cups-client / cups-common / cups-core-drivers / etc');
}