cPanel – Restorepkg Arbitrary Command Execution (R911-0103)

Type: Arbitrary Command Execution
Location: Local
Impact: High
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:,, &
CVE: -
R911: 0103
Date: 2013-12-18
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:

It is possible for a malicious user to manipulate a backup archive to include modified grant tables which could perform arbitrary command executions as root.


We have deemed this vulnerability to be rated as HIGH due to the fact that any command can be performed as root. We are disappointed that cPanel did not assign this vulnerability a rating, as the potential for servers to be compromised as a result is very real.

Vulnerable Version:

This vulnerability was tested against cPanel 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:

2013-11-12: Vendor contacted via email.
2013-11-12: Vendor confirms vulnerability.
2013-12-16: Vendor issues updates to all builds.
2013-12-18: Rack911 issues security advisory.