PT-2021-23479 · Mediawiki+1 · Loops Extension+2

Rhinosf1 · Published 2021-10-06 · Updated 2024-03-06 · CVE-2021-42040

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions MediaWiki versions through 1.36.2

Description An issue was discovered in a parser function related to loop control, which allowed for an infinite loop and php-fpm hang within the Loops extension because egLoopsCountLimit is mishandled. This could lead to memory exhaustion.

Recommendations For MediaWiki versions through 1.36.2, update to a version that properly handles egLoopsCountLimit to prevent infinite loops and potential memory exhaustion. As a temporary workaround, consider disabling the Loops extension until a patch is available.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

ALT-PU-2021-3561

ALT-PU-2022-1199

BIT-MEDIAWIKI-2021-42040

CVE-2021-42040

Affected Products

Alt Linux

Loops Extension

Mediawiki

References · 9

• https://cve.org/CVERecord?id=CVE-2021-42040 · Security Note
• https://phabricator.wikimedia.org/T287347 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-42040 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-mediawiki-2021-42040 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-42040 · Security Note
• https://gerrit.wikimedia.org/r/q/I0caf6f129f94612b5bcf406a171aa5ffedea1f80 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-42040 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-42040 · Vendor Advisory
• https://t.me/cibsecurity/30128 · Telegram Post