#VU89200 Improper access control in MediaWiki - CVE-2024-34505

Vulnerability identifier: #VU89200

Vulnerability risk: Medium

CVSSv4.0: [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-34505

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to temporary account IP reveal does not check the deleted status in the CheckUser extension. A remote attacker can bypass implemented security restrictions and gain unauthorized access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.39.0 rc.0 - 1.39.6, 1.40.0 rc.0 - 1.41.0

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External links
http://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/ISK76VXYSIOKYLLU2DTQUXIJV6MMWGOJ/
http://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/992795

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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.