Use-after-free in Ghostscript GhostPDL

1) Use-after-free

EUVDB-ID: #VU59316

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-45944

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the sampled_data_sample() function, called from sampled_data_continue and interp. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GhostPDL: 9.50 - 9.53.3

External links

http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29903
http://github.com/google/oss-fuzz-vulns/blob/main/vulns/ghostscript/OSV-2021-237.yaml

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.