#VU52574 Unquoted Search Path or Element in MediaWiki - CVE-2021-31553

Vulnerability identifier: #VU52574

Vulnerability risk: Medium

CVSSv4.0: 2.7 [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/E:U/U:Green]

CVE-ID: CVE-2021-31553

CWE-ID: CWE-428

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.31.0 - 1.35.1

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External links
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

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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.