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nessusUbuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-4469-1.NASL
HistoryAug 25, 2020 - 12:00 a.m.

Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Ghostscript vulnerabilities (USN-4469-1)

2020-08-2500:00:00
Ubuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
23

6.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

0.005 Low

EPSS

Percentile

77.1%

It was discovered that Ghostscript incorrectly handled certain document files. If a user or automated system were tricked into processing a specially crafted file, a remote attacker could use this issue to cause Ghostscript to crash, resulting in a denial of service, or possibly execute arbitrary code.

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.

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4469-1. 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(139782);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id(
    "CVE-2020-16287",
    "CVE-2020-16288",
    "CVE-2020-16289",
    "CVE-2020-16290",
    "CVE-2020-16291",
    "CVE-2020-16292",
    "CVE-2020-16293",
    "CVE-2020-16294",
    "CVE-2020-16295",
    "CVE-2020-16296",
    "CVE-2020-16297",
    "CVE-2020-16298",
    "CVE-2020-16299",
    "CVE-2020-16300",
    "CVE-2020-16301",
    "CVE-2020-16302",
    "CVE-2020-16303",
    "CVE-2020-16304",
    "CVE-2020-16305",
    "CVE-2020-16306",
    "CVE-2020-16307",
    "CVE-2020-16308",
    "CVE-2020-16309",
    "CVE-2020-16310",
    "CVE-2020-17538"
  );
  script_xref(name:"USN", value:"4469-1");
  script_xref(name:"IAVB", value:"2020-B-0046-S");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Ghostscript vulnerabilities (USN-4469-1)");

  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 Ghostscript incorrectly handled certain
document files. If a user or automated system were tricked into
processing a specially crafted file, a remote attacker could use this
issue to cause Ghostscript to crash, resulting in a denial of service,
or possibly execute arbitrary code.

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-4469-1");
  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:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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-2020-16303");

  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:"2020/08/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ghostscript");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ghostscript-x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgs-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgs9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgs9-common");
  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:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 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 || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04', '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': 'ghostscript', 'pkgver': '9.26~dfsg+0-0ubuntu0.16.04.13'},
    {'osver': '16.04', 'pkgname': 'ghostscript-x', 'pkgver': '9.26~dfsg+0-0ubuntu0.16.04.13'},
    {'osver': '16.04', 'pkgname': 'libgs-dev', 'pkgver': '9.26~dfsg+0-0ubuntu0.16.04.13'},
    {'osver': '16.04', 'pkgname': 'libgs9', 'pkgver': '9.26~dfsg+0-0ubuntu0.16.04.13'},
    {'osver': '16.04', 'pkgname': 'libgs9-common', 'pkgver': '9.26~dfsg+0-0ubuntu0.16.04.13'},
    {'osver': '18.04', 'pkgname': 'ghostscript', 'pkgver': '9.26~dfsg+0-0ubuntu0.18.04.13'},
    {'osver': '18.04', 'pkgname': 'ghostscript-x', 'pkgver': '9.26~dfsg+0-0ubuntu0.18.04.13'},
    {'osver': '18.04', 'pkgname': 'libgs-dev', 'pkgver': '9.26~dfsg+0-0ubuntu0.18.04.13'},
    {'osver': '18.04', 'pkgname': 'libgs9', 'pkgver': '9.26~dfsg+0-0ubuntu0.18.04.13'},
    {'osver': '18.04', 'pkgname': 'libgs9-common', 'pkgver': '9.26~dfsg+0-0ubuntu0.18.04.13'},
    {'osver': '20.04', 'pkgname': 'ghostscript', 'pkgver': '9.50~dfsg-5ubuntu4.2'},
    {'osver': '20.04', 'pkgname': 'ghostscript-x', 'pkgver': '9.50~dfsg-5ubuntu4.2'},
    {'osver': '20.04', 'pkgname': 'libgs-dev', 'pkgver': '9.50~dfsg-5ubuntu4.2'},
    {'osver': '20.04', 'pkgname': 'libgs9', 'pkgver': '9.50~dfsg-5ubuntu4.2'},
    {'osver': '20.04', 'pkgname': 'libgs9-common', 'pkgver': '9.50~dfsg-5ubuntu4.2'}
];

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, 'ghostscript / ghostscript-x / libgs-dev / libgs9 / libgs9-common');
}
VendorProductVersionCPE
canonicalubuntu_linuxghostscriptp-cpe:/a:canonical:ubuntu_linux:ghostscript
canonicalubuntu_linuxghostscript-xp-cpe:/a:canonical:ubuntu_linux:ghostscript-x
canonicalubuntu_linuxlibgs-devp-cpe:/a:canonical:ubuntu_linux:libgs-dev
canonicalubuntu_linuxlibgs9p-cpe:/a:canonical:ubuntu_linux:libgs9
canonicalubuntu_linuxlibgs9-commonp-cpe:/a:canonical:ubuntu_linux:libgs9-common
canonicalubuntu_linux16.04cpe:/o:canonical:ubuntu_linux:16.04:-:lts
canonicalubuntu_linux18.04cpe:/o:canonical:ubuntu_linux:18.04:-:lts
canonicalubuntu_linux20.04cpe:/o:canonical:ubuntu_linux:20.04:-:lts

References

6.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

0.005 Low

EPSS

Percentile

77.1%