The wfMangleFlashPolicy function in OutputHandler.php in MediaWiki before 1.19.22, 1.20.x through 1.22.x before 1.22.14, and 1.23.x before 1.23.7 allows remote attackers to conduct PHP object injection attacks via a crafted string containing in a PHP format request, which causes the string length to change when converting the request to .

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-9277
• https://lists.wikimedia.org/pipermail/mediawiki-announce/2014-November/000170.html
• https://phabricator.wikimedia.org/T73478
• http://securitytracker.com/id?1031301
• http://www.debian.org/security/2014/dsa-3100
• http://www.openwall.com/lists/oss-security/2014/12/03/9
• http://www.openwall.com/lists/oss-security/2014/12/04/16