[IT-SecNots] [MediaWiki-announce] MediaWiki Extensions and Skins Security Release Supplement (1.31.13/1.35.2)

[Scott Bassett <sbassett AT wikimedia.org>]

Greetings-

With the security/maintenance release of MediaWiki 1.31.13/1.35.2 [0], we
would also like to provide this supplementary announcement of MediaWiki
extensions and skins with now-public Phabricator tasks, security patches
and backports [1]:

== CommentBox ==
+ (T270767, CVE-2021-31550) - Wg variables aren't validated by CommentBox -
possible raw html insertion risk
<https://gerrit.wikimedia.org/r/651934>

== AbuseFilter ==
+ (T272333, CVE-2021-31548) - Disallow the edit if blocking the user didn't
succeed
<https://gerrit.wikimedia.org/r/657092>

== WikiLove ==
+ (T270142, CVE-2021-31557) - mw.config.get( 'wikilove-anon' ) leaks the
existence of hidden users
<https://gerrit.wikimedia.org/r/q/Ibcd87abe01719222beadcfc0de13038c3021adef>

== PageForms ==
+ (T259433, CVE-2021-31551) - XSS issue in Extension:PageForms
<https://gerrit.wikimedia.org/r/q/I5e0abbc2f80e6bda255b3b32a4df39a7fe7d3793>
<https://gerrit.wikimedia.org/r/q/Ibe68b070ee791cd0c8e7f50eb04ac4e066b1512c>
<https://gerrit.wikimedia.org/r/q/I20b63bd38779d2ccbe2d86f9879df85ca3b685f6>

== AbuseFilter ==
+ (T71617, CVE-2021-31546) - AbuseFilter logs suppression deletions
<https://gerrit.wikimedia.org/r/q/I38a0a24fa32ca7a052b6940864a32b3856e84553>

== AbuseFilter ==
+ (T223654, CVE-2021-31547) - AbuseFilterCheckMatch API reveals suppressed
edits and usernames
<https://gerrit.wikimedia.org/r/q/I4900b1be73323599d74e3164447f81eded094d75>
<https://gerrit.wikimedia.org/r/q/I3f7dbd8b873d411e37c8c3aac2339bf5ec36907d>

== AbuseFilter ==
+ (T71367, CVE-2021-31545) - page_recent_contributors leaks revdeleted user
names
<https://gerrit.wikimedia.org/r/q/I8d5ed9ca84282ee50832035af86123633fc88293>

== AbuseFilter ==
+ (T274152, CVE-2021-31549) - Special:AbuseFilter/examine reveals
suppressed usernames
<https://gerrit.wikimedia.org/r/q/I6063c02fa261c4cc0e6dbbb2db4e111eb85912c2>
<https://gerrit.wikimedia.org/r/q/I71a6d521bd12931ce60eec4d2dc35af19146000f>

== CheckUser ==
+ (T275669, CVE-2021-31553) - Checkuser stores users to cu_log with
trailing spaces, allowing all CUs to turn off Special:CheckuserLog at will
<https://gerrit.wikimedia.org/r/666963>
<https://gerrit.wikimedia.org/r/666964>

== AbuseFilter ==
+ (T152394, CVE-2021-31552) - AbuseFilter privacy concerns on action ==
'createaccount' and 'accountname'
<https://gerrit.wikimedia.org/r/q/I8bae477ad7e4d0190335363ac2decf28e4313da1>

== AbuseFilter ==
+ (T272244, CVE-2021-31554) - AbuseFilter blocks not working for account
autocreations
<https://gerrit.wikimedia.org/r/q/Ie1f4333d5b1c9d17fb2236fe38a31de427a4cc48>

== OAuth ==
+ (T277380, CVE-2021-31556) - OAuth doesn't validate length of oarc_rsa_key
<https://gerrit.wikimedia.org/r/q/I13ff0350a9a0a3cd5ab3e1f82dd0d8d9c13cf9e9>

== OAuth ==
+ (T277388, CVE-2021-31555) - OAuth doesn't validate length of oarc_version
<https://gerrit.wikimedia.org/r/q/I222c053b4b14ac1ad0f5b3a51565b1b9cd4c139d>

The Wikimedia Security Team recommends updating these extensions and/or
skins to the current master branch or relevant, supported release branch
[2] as soon as possible. Some of the referenced Phabricator tasks above
_may_ still be private. Unfortunately, when security issues are reported,
sometimes sensitive information is exposed and since Phabricator is
historical, we cannot make these tasks public without exposing this
sensitive information. If you have any additional questions or concerns
regarding this update, please feel free to contact security AT wikimedia.org
or file a security task within Phabricator [3].

[0]
https://lists.wikimedia.org/pipermail/mediawiki-announce/2021-April/000272.html
[1] https://phabricator.wikimedia.org/T270466
[2] https://www.mediawiki.org/wiki/Version_lifecycle
[3] https://www.mediawiki.org/wiki/Reporting_security_bugs

-- 
Scott Bassett
sbassett AT wikimedia.org
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