Bug 2009517 (CVE-2021-41800)

Summary:	CVE-2021-41800 mediawiki: mishandled PoolCounter's protection may result DoS when visiting Special:Contributions.
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aos-bugs, Axel.Thimm, bmontgom, eparis, jburrell, jokerman, mike, nstielau, puiterwijk, shurley, sponnaga, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	mediawiki 1.31.16, mediawiki 1.35.4, mediawiki 1.36.2	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in MediaWiki, where Visiting Special:Contributions may result in a long query due to mishandled PoolCounter protection. This issue may cause resource exhaustion, resulting in a denial of service. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 09:08:36 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2010199
Bug Blocks:	2009518

Description Pedro Sampaio 2021-09-30 20:26:23 UTC

A flaw was found in Mediawiki before 1.31.16, 1.35.4 and 1.36.2. The call to $pager->getNumRows() itself triggers execution of the database query backing the page.

References:

https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/message/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/

Comment 1 Przemyslaw Roguski 2021-10-04 07:45:39 UTC

Created mediawiki tracking bugs for this issue:

Affects: fedora-all [bug 2010199]