CVE-2022-24724

Name	CVE-2022-24724
Description	cmark-gfm is GitHub's extended version of the C reference implementation of CommonMark. Prior to versions 0.29.0.gfm.3 and 0.28.3.gfm.21, an integer overflow in cmark-gfm's table row parsing `table.c:row_from_string` may lead to heap memory corruption when parsing tables who's marker rows contain more than UINT16_MAX columns. The impact of this heap corruption ranges from Information Leak to Arbitrary Code Execution depending on how and where `cmark-gfm` is used. If `cmark-gfm` is used for rendering remote user controlled markdown, this vulnerability may lead to Remote Code Execution (RCE) in applications employing affected versions of the `cmark-gfm` library. This vulnerability has been patched in the following cmark-gfm versions 0.29.0.gfm.3 and 0.28.3.gfm.21. A workaround is available. The vulnerability exists in the table markdown extensions of cmark-gfm. Disabling the table extension will prevent this vulnerability from being triggered.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
Debian Bugs	1006756, 1006757, 1006758, 1006759, 1006760

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cmark-gfm (PTS)	buster	0.28.3.gfm.19-3	vulnerable
	bullseye	0.29.0.gfm.0-6	vulnerable
	bookworm, sid	0.29.0.gfm.3-3	fixed
ghostwriter (PTS)	buster	1.7.4-2	vulnerable
	bullseye	1.8.1-2	vulnerable
	bookworm, sid	2.1.1-1	vulnerable
python-cmarkgfm (PTS)	buster, bullseye	0.4.2-1	vulnerable
	bookworm, sid	0.8.0-1	fixed
r-cran-commonmark (PTS)	buster	1.7-1	vulnerable
	bullseye	1.7-2	vulnerable
	bookworm, sid	1.8.0-1	fixed
ruby-commonmarker (PTS)	buster	0.17.9-1	vulnerable
	bullseye	0.21.0-1	vulnerable
	bookworm, sid	0.23.4-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Debian Bugs
cmark-gfm	source	(unstable)	0.29.0.gfm.3-3	1006756
ghostwriter	source	(unstable)	(unfixed)	1006757
python-cmarkgfm	source	(unstable)	0.7.0-1	1006758
r-cran-commonmark	source	(unstable)	1.8.0-1	1006760
ruby-commonmarker	source	(unstable)	(unfixed)	1006759

Notes

https://github.com/github/cmark-gfm/security/advisories/GHSA-mc3g-88wq-6f4x
https://github.com/github/cmark-gfm/releases/tag/0.29.0.gfm.3
https://github.com/github/cmark-gfm/commit/ac80f7b56522ffa158e1f0c14a611ffccacd4027 (0.29.0.gfm.3)
https://bugs.chromium.org/p/project-zero/issues/detail?id=2258