Bug 2009511 (CVE-2021-41799)

Summary:	CVE-2021-41799 mediawiki: ApiQueryBacklinks can cause a full table scan and as a result DoS
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:	When processing ApiQueryBacklinks, the full db table scan might be initiated what can cause resource exhaustion and in a consequence the denial of service (DoS).	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-02 00:21:12 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:	2010201
Bug Blocks:	2009518

Description Pedro Sampaio 2021-09-30 20:04:14 UTC

A flaw was found in Mediawiki before 1.31.16, 1.35.4 and 1.36.2. An improper database query in ApiQueryBacklinks may lead to a full table scan leading to exposure of confidential information.

References:

https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/message/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
https://phabricator.wikimedia.org/T290379

Comment 1 juneau 2021-10-01 14:25:21 UTC

OSD affected/ooss.

Comment 2 Product Security DevOps Team 2021-10-02 00:21:12 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-41799

Comment 3 Przemyslaw Roguski 2021-10-04 07:46:41 UTC

Created mediawiki tracking bugs for this issue:

Affects: fedora-all [bug 2010201]