Bug 1815173 (CVE-2020-10534)

Summary:	CVE-2020-10534 mediawiki: IP range evaluation issue allows blocked users regain escalated privileges
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aos-bugs, Axel.Thimm, bmontgom, eparis, jburrell, jokerman, mike, nstielau, puiterwijk, shurley, sponnaga
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-02 10:31:57 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:	1815174
Bug Blocks:	1815175

Description Guilherme de Almeida Suckevicz 2020-03-19 17:19:24 UTC

In the GlobalBlocking extension before 2020-03-10 for MediaWiki through 1.34.0, an issue related to IP range evaluation resulted in blocked users re-gaining escalated privileges. This is related to the case in which an IP address is contained in two ranges, one of which is locally disabled.

Reference:
https://phabricator.wikimedia.org/T229731

Upstream commit:
https://gerrit.wikimedia.org/r/#/q/I9cc5fb2c08c78bbd797a5fc6d89f4577c8cc118b

Comment 1 Guilherme de Almeida Suckevicz 2020-03-19 17:20:21 UTC

Created mediawiki tracking bugs for this issue:

Affects: fedora-all [bug 1815174]

Comment 2 Michael Cronenworth 2020-03-20 17:40:01 UTC

This issue is for the *extension* GlobalBlocking. It is not shipped as a bundled extension and the patch is *not* in the core of mediawiki. This bug should not have been opened.

Comment 3 Mark Cooper 2020-04-02 06:00:56 UTC

Agreed, seems strange. 

Setting OpenShift 3 and 4 to not affected. 

Whilst MediaWiki does include extensions by default GlobalBlocking is not one of them. Not even sure the status of the extension given that it's been in beta for several years: 
    - https://www.mediawiki.org/wiki/Extension:GlobalBlocking
    - https://www.mediawiki.org/wiki/Extension_talk:GlobalBlocking

Confirmed the following OpenShift images don't include GlobalBlocking. 
     - openshift3/mediawiki
     - openshift4/mediawiki

Comment 4 Product Security DevOps Team 2020-04-02 10:31:57 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-2020-10534