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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, ultimately 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.
We have deemed this vulnerability to be rated as CRITICAL due to the fact that root access can be obtained.
This vulnerability was tested against CloudFlare (cPanel Plugin) v4.1 and is believed to exist in all prior versions.
This vulnerability was patched in CloudFlare (cPanel Plugin) v4.2.
Vendor Contact Timeline:
2013-09-30: Vendor contacted in person.
2013-09-30: Vendor confirms vulnerability.
2013-10-13: Vendor issues updates to all builds.
2013-10-15: Vendor + Rack911 issues security advisory.