#VU16072 Type confusion in Ghostscript and GhostXPS - CVE-2018-19477

Vulnerability identifier: #VU16072

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-19477

CWE-ID: CWE-843

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ghostscript
Universal components / Libraries / Libraries used by multiple products
GhostXPS
Universal components / Libraries / Libraries used by multiple products

Vendor: Artifex Software, Inc.

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The vulnerability exists due to a JBIG2Decode type confusion condition in the psi/zfjbig2.csource code file. A remote unauthenticated attacker can trick the victim into accessing a PostScript file that submits malicious input to bypass the security access restrictions on the targeted system, which could be used to conduct further attacks.

Mitigation
Update to version 9.26.

Vulnerable software versions

Ghostscript: 9.00 - 9.25

GhostXPS: 9.21

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External links
https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=ef252e7dc214bcbd9a2539216aab9202848602bb

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.