Overview:
Unauthenticated user-level Remote Code Execution (RCE) vulnerability in admin/config.php, the main interface to FreePBX.  This bug was introduced in FreePBX 2.9, earlier versions are not affected.

Score - 8.4 
(AV:N/AC:L/Au:N/C:P/I:P/A:C/E:H/RL:OF/RC:C/CDP:MH/TD:ND/CR:L/IR:L/AR:M)

Reference to Advisory:
http://www.freepbx.org/news/2014-02-06/security-vulnerability-notice

Reference to Bug:
http://issues.freepbx.org/browse/FREEPBX-7123

Fixed in Versions:
2.9 -- 2.9.0.14
2.10 - 2.10.1.15
2.11 - 2.11.0.23
12 - 12.0.1alpha22

Additional Information:
FreePBX contains an automatic alert service for upgrade notifications. If your system is set up correctly, you would have received an email alert of this vulnerability when it was detected and fixed.  Schmoozecom strongly urges you to ensure that the email alert address is correct and up to date to ensure you receive notifications of security issues and pending updates.

Schmoozecom and FreePBX are very proactive and responsive to security issues, and care deeply about the security of our software and systems. We welcome security related bug reports and issues, and they can be submitted via email to security@freepbx.org for instant attention.