CloudFlare (cPanel) – Local Privilege Escalation Vulnerability (R911-0081)

Type: Privilege Escalation
Location: Local
Impact: Critical
Product: CloudFlare (cPanel Plugin)
Website: http://www.cloudflare.com
Vulnerable Version: 4.2
Fixed Version: 4.5
CVE: -
R911: 0081
Date: 2013-10-22
By: Rack911

Product Description:

CloudFlare protects and accelerates any website online. Once your website is a part of the CloudFlare community, its web traffic is routed through our intelligent global network. We automatically optimize the delivery of your web pages so your visitors get the fastest page load times and best performance. We also block threats and limit abusive bots and crawlers from wasting your bandwidth and server resources. The result: CloudFlare-powered websites see a significant improvement in performance and a decrease in spam and other attacks.

Vulnerability Description:

There is a local privilege escalation flaw in CloudFlare’s cPanel Plugin that would allow an attacker to write to any file on the server leading to a root compromise.

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.

Impact:

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

Vulnerable Version:

This vulnerability was tested against CloudFlare (cPanel Plugin) v4.2 and is believed to exist in all prior versions.

Fixed Version:

This vulnerability was patched CloudFlare (cPanel Plugin) v4.5.

Vendor Contact Timeline:

2013-10-18: Vendor contacted via email.
2013-10-18: Vendor confirms vulnerability.
2013-10-21: Vendor issues updates to all builds.
2013-10-22: Rack911 issues security advisory.