Greetings-

With the security/maintenance release of MediaWiki 1.31.11/1.35.1 [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]:

 == Cosmos Skin ==
 + (T265440, CVE-2020-27620) - Mix used of wfMessage() calls with no output
mode and Html::rawElement
 <
https://gerrit.wikimedia.org/r/q/I738471981be4b394caf65de615e8ee4ab36a9782 >

 == FileImporter ==
 + (T265810, CVE-2020-27621) - uses a WMF IP address, does not include XFF
for users using this extension
 <
https://gerrit.wikimedia.org/r/q/I24a240253c7a5c66dd493a68e8c23d95a17e1b21 >

 == RandomGameUnit ==
 + (T266400, CVE-2020-27957) - Stored XSS
 <
https://gerrit.wikimedia.org/r/q/I497d2076038f75c9eb77e0e250f2af56f5bd2bfc >

 == PollNY ==
 + (T266508, CVE-2020-29003) - Stored XSS
 <
https://gerrit.wikimedia.org/r/q/Ic5b8f579c303e9666a0b7d815230e4ce08557027 >

 = CologneBlue ==
 + (T267278, CVE-2020-29002) - XSS vulnerability
 <
https://gerrit.wikimedia.org/r/q/Ie798a4f16d0ac2a4871aefeb593d962966aeb6b0 >

 == Push ==
 + (T262724, CVE-2020-29004, CVE-2020-29005) - Push extension exposes login
credentials
 <
https://gerrit.wikimedia.org/r/q/I15d76536a6cf256417d7e28838e4cdb66245adf5 >

 == PushToWatch ==
 + (T268641, CVE-2020-35626) - classic CSRF
 <
https://gerrit.wikimedia.org/r/q/I3f41d8087af2ae22581836f7c32baac97f348044 >

 == SecurePoll ==
 + (T268794, CVE-2020-35624) - SecurePoll should not show the exact time of
cast votes publicly
 <
https://gerrit.wikimedia.org/r/q/If8e15eb8ce9ec652c06816cbff52bb084fd50e73 >

 == GlobalUsage ==
 + (T268341, CVE-2020-35622) - XSS in SpecialGlobalUsage
 <
https://gerrit.wikimedia.org/r/q/I3d4689529c976cff14c9ab218eab67d0c7b9cad6 >

 == Widgets ==
 + (T269718, CVE-2020-35625) - RCE in Widgets extension
 <
https://gerrit.wikimedia.org/r/q/Ic899a8b15bc510e61cdacb5c024af2d226a2dbeb >

 == CASAuth ==
 + (T263498, CVE-2020-35623) - Logins to MW with at least one SSO client
extension allows masquerading as another user
 < https://github.com/CWRUChielLab/CASAuth/pull/10 >

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 secur...@wikimedia.org
or file a security task within Phabricator [3].

[0]
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
[1] https://phabricator.wikimedia.org/T263810
[2] https://www.mediawiki.org/wiki/Version_lifecycle
[3] https://www.mediawiki.org/wiki/Reporting_security_bugs

-- 
Scott Bassett
sbass...@wikimedia.org
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