CVE-2024-43407

Name	CVE-2024-43407
Description	CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A potential vulnerability has been discovered in CKEditor 4 Code Snippet GeSHi plugin. The vulnerability allowed a reflected XSS attack by exploiting a flaw in the GeSHi syntax highlighter library hosted by the victim. The GeSHi library was included as a vendor dependency in CKEditor 4 source files. In a specific scenario, an attacker could craft a malicious script that could be executed by sending a request to the GeSHi library hosted on a PHP web server. The GeSHi library is no longer actively maintained. Due to the lack of ongoing support and updates, potential security vulnerabilities have been identified with its continued use. To mitigate these risks and enhance the overall security of the CKEditor 4, we have decided to completely remove the GeSHi library as a dependency. This change aims to maintain a secure environment and reduce the risk of any security incidents related to outdated or unsupported software. The fix is be available in version 4.25.0-lts.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1083192

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ckeditor (PTS)	jessie, jessie (lts)	4.4.4+dfsg1-3+deb8u2	vulnerable
	stretch (security)	4.5.7+dfsg-2+deb9u1	vulnerable
	stretch (lts), stretch	4.5.7+dfsg-2+deb9u2	vulnerable
	buster	4.11.1+dfsg-1	vulnerable
	bullseye	4.16.0+dfsg-2	vulnerable
	bookworm	4.19.1+dfsg-1	vulnerable
	sid, trixie	4.22.1+dfsg1-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Debian Bugs
ckeditor	source	stretch	(unfixed)	end-of-life
ckeditor	source	buster	(unfixed)	end-of-life
ckeditor	source	(unstable)	(unfixed)		1083192

Notes

[bookworm] - ckeditor <no-dsa> (Minor issue)
[bullseye] - ckeditor <postponed> (Minor issue)
https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7r32-vfj5-c2jv
Fixed by removing the plugins/codesnippetgeshi/dev directory completely.
https://github.com/ckeditor/ckeditor4/commit/71072c9f7f263329841bd38e7e5309074c82ef94 (4.25.0-lts)
https://github.com/ckeditor/ckeditor4/commit/951e7d75fcbcaa2590b0719fb0bb0dd0539ca6fa (4.25.0-lts)
[jessie] - ckeditor <postponed> (Fix along next ELA)