Bug 1903776 (CVE-2020-25828) - CVE-2020-25828 mediawiki: non-jqueryMsg version of mw.message().parse() doesn't escape HTML leads to XSS
Summary: CVE-2020-25828 mediawiki: non-jqueryMsg version of mw.message().parse() doesn...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25828
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1903778
Blocks: 1903781
TreeView+ depends on / blocked
 
Reported: 2020-12-02 18:38 UTC by Dhananjay Arunesh
Modified: 2021-02-16 18:47 UTC (History)
11 users (show)

Fixed In Version: mediawiki-1.34.4, mediawiki-1.31.10
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-12-07 17:02:58 UTC


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Description Dhananjay Arunesh 2020-12-02 18:38:11 UTC
An issue was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. This affects both message contents (which are generally safe) and the parameters (which can be based on user input). (When jqueryMsg is loaded, it correctly accepts only whitelisted tags in message contents, and escapes all parameters. Situations with an unloaded jqueryMsg are rare in practice, but can for example occur for Special:SpecialPages on a wiki with no extensions installed.)

References:
https://lists.wikimedia.org/pipermail/mediawiki-announce
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html

Comment 1 Dhananjay Arunesh 2020-12-02 18:38:51 UTC
Created mediawiki tracking bugs for this issue:

Affects: fedora-all [bug 1903778]

Comment 3 Przemyslaw Roguski 2020-12-07 16:45:16 UTC
Statement:

OpenShift Container Platform (OCP)  delivers the mediawiki package, but the vulnerable code is not bundled, therefore OCP is not affected by this flaw.

Comment 4 Przemyslaw Roguski 2020-12-07 16:45:19 UTC
External References:

https://phabricator.wikimedia.org/T115888

Comment 5 Product Security DevOps Team 2020-12-07 17:02:58 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-2020-25828


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