cPanel – LeechProtect Denial of Service (R911-0166)

Type: Denial of Service
Location: Local
Impact: Medium
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:,, &
CVE: -
R911: 0166
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 user to crash the LeechProtect service on cPanel by modifying the necessary mod_rewrite rules to include a certain string. The malicious user then opens the page being protected by LeechProtect and the crash will occur.


We have deemed this vulnerability to be rated as MEDIUM due to the fact that the LeechProtect service can be crashed but no sensitive information obtained.

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:

2014-03-10: Vendor contacted via email.
2014-03-19: Vendor confirms vulnerability.
2014-07-21: Vendor issues updates to all builds.
2014-07-28: RACK911 issues security advisory.