cPanel – DNS Cluster Arbitrary Command Execution Vulnerability (R911-0123)

Type: Arbitrary Command Execution
Location: Remote
Impact: High
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:, &
CVE: -
R911: 0123
Date: 2014-02-05
By: Rack911

Product Description:

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.

Vulnerability Description:

Due to an arbitrary command execution within the DNS clustering system, it is possible for a reseller to run ANY command as root which would ultimately lead to a privilege escalation. This exploit also includes an input validation failure.


We have deemed this vulnerability to be rated as HIGH due to the fact that root access can be obtained.

Vulnerable Version:

This vulnerability was tested against cPanel 11.40.0 #19 and is believed to exist in all versions prior to the fixed builds below.

Fixed Version:

This vulnerability was patched in cPanel, &

Vendor Contact Timeline:

2014-01-09: Vendor contacted via email.
2014-01-10: Vendor confirms vulnerability.
2014-02-03: Vendor issues updates to all builds.
2014-02-05: Rack911 issues security advisory.