Resource exhaustion in cmark-gfm - CVE-2022-39209

Vulnerability identifier: #VU67493

CSH Severity: Medium

CVSS v4: 7.1 [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]

CVE-ID: CVE-2022-39209

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

cmark-gfm
Ubuntu
Fedora
cmark-gfm (Ubuntu package)
ghc-cmark-gfm
ghostwriter

Install updates from vendor's website.

cmark-gfm - update to 0.29.0.gfm.6
cmark-gfm (Ubuntu package) - addressed in versions Ubuntu Pro, 0.29.0.gfm.6-6ubuntu0.24.10.1
ghc-cmark-gfm - addressed in versions 0.2.5-1.fc35, 0.2.5-1.fc36, 0.2.5-1.fc37
ghostwriter - update to 23.03.90-2.fc39

• 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

• Denial of service in GitHub cmark-gfm
• Fedora 39 update for ghostwriter
• Fedora 37 update for ghc-cmark-gfm
• Fedora 35 update for ghc-cmark-gfm
• Fedora 36 update for ghc-cmark-gfm
• Ubuntu update for cmark-gfm