admin/libraries/view.functions.php in FreePBX 2.9 before 2.9.0.14, 2.10 before 2.10.1.15, 2.11 before 2.11.0.23, and 12 before 12.0.1alpha22 does not restrict the set of functions accessible to the API handler, which allows remote attackers to execute arbitrary PHP code via the function and args parameters to admin/config.php.
https://github.com/0x00string/oldays/blob/master/CVE-2014-1903.pl
http://www.securityfocus.com/archive/1/531040/100/0/threaded
http://www.freepbx.org/news/2014-02-06/security-vulnerability-notice
http://packetstormsecurity.com/files/125215/FreePBX-2.9-Remote-Code-Execution.html
http://packetstormsecurity.com/files/125166/FreePBX-2.x-Code-Execution.html
http://issues.freepbx.org/browse/FREEPBX-7123
http://issues.freepbx.org/browse/FREEPBX-7117
http://code.freepbx.org/changelog/FreePBX_SVN?cs=16429
http://code.freepbx.org/changelog/FreePBX_Framework?cs=a29382efeb293ef4f42aa9b841dfc8eabb2d1e03
http://archives.neohapsis.com/archives/fulldisclosure/2014-02/0111.html
http://archives.neohapsis.com/archives/fulldisclosure/2014-02/0097.html