Denial of service in GitHub cmark-gfm

1) Resource exhaustion

EUVDB-ID: #VU67493

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-39209

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a polynomial time complexity issue in the autolink extension. A remote user can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

cmark-gfm: 0.29.0.gfm.0 - 0.29.0.gfm.5

CPE2.3

• cpe:2.3:a:github:cmark-gfm:0.29.0.gfm.0:*:*:*:*:*:*:*
• cpe:2.3:a:github:cmark-gfm:0.29.0.gfm.1:*:*:*:*:*:*:*
• cpe:2.3:a:github:cmark-gfm:0.29.0.gfm.2:*:*:*:*:*:*:*
• cpe:2.3:a:github:cmark-gfm:0.29.0.gfm.3:*:*:*:*:*:*:*
• cpe:2.3:a:github:cmark-gfm:0.29.0.gfm.4:*:*:*:*:*:*:*
• cpe:2.3:a:github:cmark-gfm:0.29.0.gfm.5:*:*:*:*:*:*:*

External links

https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q
https://en.wikipedia.org/wiki/Time_complexity
https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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