Resource exhaustion in MediaWiki - CVE-2021-41799

 

Resource exhaustion in MediaWiki - CVE-2021-41799

Published: October 1, 2021


Vulnerability identifier: #VU56981
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-41799
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing ApiQueryBacklinks. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.


Affected software

MediaWiki
mediawiki (Debian package)
mediawiki
Fedora

How to mitigate CVE-2021-41799

Install updates from vendor's website.

MediaWiki - addressed in versions 1.31.16, 1.35.4, 1.36.2
mediawiki (Debian package) - addressed in versions 1:1.31.16-1~deb10u1, 1:1.35.4-1~deb11u1
mediawiki - addressed in versions 1.35.4-1.fc33, 1.35.4-1.fc34, 1.36.2-1.fc35

External References

Related Security Bulletins