Zero-day vulnerability in Ghostscript

Type confusion
CVE-2017-8291

Vulnerability details

Advisory: SB2017042603 - Remote command injection in Ghostscript

Vulnerable component: Ghostscript

CVE-ID: CVE-2017-8291

CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-704 - Incorrect Type Conversion or Cast (Type Conversion)

Description:

The vulnerability allows a remote unauthenticated attacker to execute arbitrary commands on a targeted system.

The weakness exists due to type confusion error when processing user-supplied parameters passed to the .rsdparams and .eqproc functions in ghostscript. A remote attacker can submit a specially crafted .eps document, execute code in the context of the ghostscript process and bypass -dSAFER protection.

Successful exploitation of the vulnerability may result in system compromise.

Note: this vulnerability is being exploited in the wild.

Public Exploits:

- Ghostscript 9.21 - Type Confusion Arbitrary Command Execution (Metasploit) [Exploit-DB]

Latest references in media:

- Critical Sandbox Bypass Vulnerabilities in Ghostscript Interpreter Could Leave Many Software and Systems at Risk of Hacking [2018-08-22 10:30:05]

- No Patch Available Yet for New Major Vulnerability in Ghostscript Interpreter [2018-08-22 09:40:23]

- North Korean Hackers Prep Attacks Against Cryptocurrency Exchanges: Report [2018-01-16 20:01:34]

- SystemD wins top gong for 'lamest vendor' in Pwnie security awards [2017-07-28 22:50:02]

External links:

https://bugs.ghostscript.com/show_bug.cgi?id=697799
http://seclists.org/oss-sec/2017/q2/155

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About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.