cPanel – Adddns Input Validation Failure (R911-0168)

Type: Input Validation Failure
Location: Remote
Impact: High
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:,, &
CVE: -
R911: 0168
Date: 2014-07-28
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 reseller to take ownership of the servers hostname DNS zone due to an input validation failure within the Adddns Function.


We have deemed this vulnerability to be rated as HIGH due to the fact that the malicious reseller could intercept email bounces, failures and other server communications intended for addresses that make use of the server hostname.

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:

2014-06-22: Vendor contacted via email.
2014-06-22: Vendor confirms vulnerability.
2014-07-21: Vendor issues updates to all builds.
2014-07-28: RACK911 issues security advisory.