Type: Privilege Escalation
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version: 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199 & 188.8.131.52
cPanel is an easy-to-use control panel that gives web hosts and the website owners they serve, the ability to quickly and easily manage their servers and websites. Web Host Manager (WHM) is a part of the cPanel software, often used by resellers and system administrators.
There is a flaw within the Upload Locale XML feature available to resellers that could allow an attacker to inject data into any file on the server regardless of ownership thus giving themselves root access.
Proof of Concept:
Due to the nature of this security flaw, we will not be posting a Proof of Concept until a much later date.
We have deemed this vulnerability to be rated as HIGH due to the fact that root access can be obtained.
This vulnerability was tested against cPanel 184.108.40.206 and is believed to exist in all versions prior to the fixed builds below.
This vulnerability was patched in cPanel 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199 & 188.8.131.52.
Vendor Contact Timeline:
2013-08-01: Vendor contacted via email.
2013-08-27: Vendor confirms vulnerability.
2013-08-27: Vendor issues updates to all builds.
2013-08-29: Rack911 issues security advisory.