CentOS 7 : ghostscript (CESA-2018:2918) - Nessus

High Plugin ID: 118118

This page contains detailed information about the CentOS 7 : ghostscript (CESA-2018:2918) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 118118
Name: CentOS 7 : ghostscript (CESA-2018:2918)
Filename: centos_RHSA-2018-2918.nasl
Vulnerability Published: 2018-04-18
This Plugin Published: 2018-10-16
Last Modification Time: 2019-12-31
Plugin Version: 1.6
Plugin Type: local
Plugin Family: CentOS Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/CentOS/release, Host/CentOS/rpm-list, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2018-04-18
Patch Published: 2018-10-15
CVE [?]: CVE-2018-10194, CVE-2018-15910, CVE-2018-16509, CVE-2018-16542
CPE [?]: cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:ghostscript, p-cpe:/a:centos:centos:ghostscript-cups, p-cpe:/a:centos:centos:ghostscript-devel, p-cpe:/a:centos:centos:ghostscript-doc, p-cpe:/a:centos:centos:ghostscript-gtk

Synopsis

The remote CentOS host is missing one or more security updates.

Description

An update for ghostscript is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The Ghostscript suite contains utilities for rendering PostScript and PDF documents. Ghostscript translates PostScript code to common bitmap formats so that the code can be displayed or printed.

Security Fix(es) :

* It was discovered that the ghostscript /invalidaccess checks fail under certain conditions. An attacker could possibly exploit this to bypass the -dSAFER protection and, for example, execute arbitrary shell commands via a specially crafted PostScript document. (CVE-2018-16509)

* ghostscript: LockDistillerParams type confusion (699656) (CVE-2018-15910)

* ghostscript: .definemodifiedfont memory corruption if /typecheck is handled (699668) (CVE-2018-16542)

* ghostscript: Stack-based out-of-bounds write in pdf_set_text_matrix function in gdevpdts.c (CVE-2018-10194)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Tavis Ormandy (Google Project Zero) for reporting CVE-2018-16509, CVE-2018-15910, and CVE-2018-16542.

Solution

Update the affected ghostscript packages.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the CentOS 7 : ghostscript (CESA-2018:2918) vulnerability:

Metasploit: exploit/multi/fileformat/ghostscript_failed_restore
[Ghostscript Failed Restore Command Execution]
Exploit-DB: exploits/linux/local/45369.rb
[EDB-45369: Ghostscript - Failed Restore Command Execution (Metasploit)]
GitHub: https://github.com/0xsyr0/OSCP
[CVE-2018-16509]
GitHub: https://github.com/AssassinUKG/CVE_2018_16509
[CVE-2018-16509: exploit..]
GitHub: https://github.com/NCSU-DANCE-Research-Group/CDL
[CVE-2018-16509]
GitHub: https://github.com/SexyBeast233/SecBooks
[CVE-2018-16509]
GitHub: https://github.com/barrracud4/image-upload-exploits
[CVE-2018-16509]
GitHub: https://github.com/rhpco/CVE-2018-16509
[CVE-2018-16509: CVE-2018-16509 Docker Playground - Ghostscript command execution]
GitHub: https://medium.com/@NumbShiva/imagemagic-rce-f364a9f50a14
[CVE-2018-16509]
GitHub: https://github.com/cved-sources/cve-2018-16509
[CVE-2018-16509: Cve-2018-16509]
GitHub: https://github.com/farisv/PIL-RCE-Ghostscript-CVE-2018-16509
[CVE-2018-16509: PoC + Docker Environment for Python PIL/Pillow Remote Shell Command Execution via ...]
GitHub: https://github.com/knqyf263/CVE-2018-16509
[CVE-2018-16509: CVE-2018-16509 (Ghostscript contains multiple -dSAFER sandbox bypass vulnerabilities) ...]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2018-16509
CVSS V2 Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	9.3 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.6
CVSS Temporal Score:	7.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.7 (High)

CVSS V3 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:	7.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.8
CVSS Temporal Score:	7.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.2 (High)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:2918 and 
# CentOS Errata and Security Advisory 2018:2918 respectively.
#

include("compat.inc");

if (description)
{
  script_id(118118);
  script_version("1.6");
  script_cvs_date("Date: 2019/12/31");

  script_cve_id("CVE-2018-10194", "CVE-2018-15910", "CVE-2018-16509", "CVE-2018-16542");
  script_xref(name:"RHSA", value:"2018:2918");

  script_name(english:"CentOS 7 : ghostscript (CESA-2018:2918)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for ghostscript is now available for Red Hat Enterprise
Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The Ghostscript suite contains utilities for rendering PostScript and
PDF documents. Ghostscript translates PostScript code to common bitmap
formats so that the code can be displayed or printed.

Security Fix(es) :

* It was discovered that the ghostscript /invalidaccess checks fail
under certain conditions. An attacker could possibly exploit this to
bypass the -dSAFER protection and, for example, execute arbitrary
shell commands via a specially crafted PostScript document.
(CVE-2018-16509)

* ghostscript: LockDistillerParams type confusion (699656)
(CVE-2018-15910)

* ghostscript: .definemodifiedfont memory corruption if /typecheck is
handled (699668) (CVE-2018-16542)

* ghostscript: Stack-based out-of-bounds write in pdf_set_text_matrix
function in gdevpdts.c (CVE-2018-10194)

For more details about the security issue(s), including the impact, a
CVSS score, and other related information, refer to the CVE page(s)
listed in the References section.

Red Hat would like to thank Tavis Ormandy (Google Project Zero) for
reporting CVE-2018-16509, CVE-2018-15910, and CVE-2018-16542."
  );
  # https://lists.centos.org/pipermail/centos-announce/2018-October/023066.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?af128a1a"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected ghostscript packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-16509");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Ghostscript Failed Restore Command Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ghostscript");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ghostscript-cups");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ghostscript-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ghostscript-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ghostscript-gtk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/04/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/16");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ghostscript-9.07-29.el7_5.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ghostscript-cups-9.07-29.el7_5.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ghostscript-devel-9.07-29.el7_5.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ghostscript-doc-9.07-29.el7_5.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ghostscript-gtk-9.07-29.el7_5.2")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ghostscript / ghostscript-cups / ghostscript-devel / etc");
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/centos_RHSA-2018-2918.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\centos_RHSA-2018-2918.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/centos_RHSA-2018-2918.nasl

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How to Run

Here is how to run the CentOS 7 : ghostscript (CESA-2018:2918) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select CentOS Local Security Checks plugin family.
On the right side table select CentOS 7 : ghostscript (CESA-2018:2918) plugin ID 118118.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl centos_RHSA-2018-2918.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a centos_RHSA-2018-2918.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - centos_RHSA-2018-2918.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state centos_RHSA-2018-2918.nasl -t <IP/HOST>

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References

RHSA | Red Hat Security Advisory:

2018:2918

See also:

Similar and related Nessus plugins:

118125 - Oracle Linux 7 : ghostscript (ELSA-2018-2918)
118128 - RHEL 7 : ghostscript (RHSA-2018:2918)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file centos_RHSA-2018-2918.nasl version 1.6. For more plugins, visit the Nessus Plugin Library.

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CentOS 7 : ghostscript (CESA-2018:2918) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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