#VU71462 Out-of-bounds read in cmark-gfm - CVE-2023-22485

Vulnerability identifier: #VU71462

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-22485

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
cmark-gfm
Universal components / Libraries / Software for developers

Vendor: GitHub

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in validate_protocol function. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

cmark-gfm: 0.29.0.gfm.0 - 0.29.0.gfm.6

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External links
https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr

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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. However, proof of concept for this vulnerability is available.