The User::matchEditToken function in includes/User.php in MediaWiki before 1.23.12, 1.24.x before 1.24.5, 1.25.x before 1.25.4, and 1.26.x before 1.26.1 does not perform token comparison in constant time before determining if a debugging message should be logged, which allows remote attackers to guess the edit token and bypass CSRF protection via a timing attack, a different vulnerability than CVE-2015-8623.
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
| Link | Tags |
|---|---|
| https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.html | patch vendor advisory mailing list release notes |
| http://www.openwall.com/lists/oss-security/2015/12/23/7 | patch mailing list third party advisory |
| https://phabricator.wikimedia.org/T119309 | third party advisory patch |
| http://www.openwall.com/lists/oss-security/2015/12/21/8 | patch mailing list third party advisory |