Timing Attack Vulnerability in MediaWiki's User::matchEditToken Function

CVE-2015-8624 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

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.

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