Vulnerability identifier: #VU81443

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to diff-multi-sameuser ("X intermediate revisions by the same user not shown") ignores username suppression. A remote user can bypass implemented security restrictions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.40.0 - 1.40.0 rc.0, 1.39.0 - 1.39.4, 1.38.0 - 1.38.7, 1.35 - 1.35.11, 1.37.0 - 1.37.6, 1.36.0 - 1.36.4, 1.34 - 1.34.4, 1.33.0 - 1.33.4, 1.32.0 - 1.32.6, 1.31.0 - 1.31.16, 1.30.0 - 1.30.2, 1.29.0 - 1.29.3, 1.28.0 - 1.28.3, 1.4 - 1.4.15, 1.6.0 - 1.6.12, 1.16 - 1.16.5, 1.18 - 1.18.6, 1.17 - 1.17.5, 1.5 - 1.5.8, 1.3 - 1.3.18, 1.11 - 1.11.2, 1.19 - 1.19.24, 1.21 - 1.21.11, 1.20 - 1.20.8, 1.27.0 - 1.27.7, 1.12.0 - 1.12.4, 1.2.0 - 1.2.6, 1.1.0, 1.26.0 - 1.26.4, 1.25.0 - 1.25.6, 1.24.0 - 1.24.6, 1.23.0 - 1.23.17, 1.22.0 - 1.22.15, 1.15.0 - 1.15.5, 1.14.0 - 1.14.1, 1.13.0 - 1.13.5, 1.10.0 - 1.10.4, 1.9.0 - 1.9.6, 1.8.0 - 1.8.5, 1.7.0 - 1.7.3

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External links
http://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/BRWOWACCHMYRIS7JRTT6XD44X3362MVL/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.