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>> FreePBX "name" and "number" Parameters Handling Remote Shell Injection Vulnerability
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Title : FreePBX "name" and "number" Parameters Handling Remote Shell Injection Vulnerability
VUPEN ID : VUPEN/ADV-2006-3019
CVE ID : CVE-2006-6244
Rated as : Moderate Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2006-07-28
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A vulnerability has been identified in FreePBX, which could be exploited by remote attackers to execute arbitrary commands. This flaw is due to an input validation error in the "amp_conf/astetc/extensions.conf" file that does not properly validate user-supplied "CALLERID(number)" and "CALLERID(name)" parameters before being passed to a "system()" call when receiving a fax, which could be exploited by remote attackers to inject and execute arbitrary shell commands with the privileges of the application.
Note : Only applications with the "Allow Anonymous Inbound SIP Calls" option enabled are vulnerable.
Affected Products
FreePBX versions 2.1.1 and prior
Solution
Upgrade to FreePBX version 2.2.0rc1 :
http://sourceforge.net/projects/amportal/
References
http://www.vupen.com/english/advisories/2006/3019
http://freepbx.org/trac/changeset/2076
http://sourceforge.net/project/shownotes.php?release_id=467129
Credits
Vulnerabilities reported by Clement Cerdini
ChangeLog
2006-07-28 : Initial release
2006-11-27 : Updated Solution
Vulnerability Management
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