Unquoted Search Path or Element in MediaWiki - CVE-2021-31553
Published: April 26, 2021
Vulnerability identifier: #VU52574
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-31553
CWE-ID: CWE-428
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to an unquoted search path issue in the CheckUser extension. A remote attacker can turn off Special:CheckUserLog and thus interfere with usage tracking.
Affected software
MediaWiki
How to mitigate CVE-2021-31553
Install updates from vendor's website.
MediaWiki - addressed in versions 1.31.13, 1.35.2
External References
- https://lists.wikimedia.org/pipermail/mediawiki-announce/2021-April/000274.html
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027
- https://phabricator.wikimedia.org/T275669
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024