The public mailing list domain of Kali Linux (lists.kali.org) was hacked and defaced April 30 by Libyan hackers going by the handle “The GreaT TeAm.”.
Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing, maintained and funded by Offensive Security Ltd.
The hacker stated that the hacked subdomain is being hosted by a company called Mailman List and that Mailman List is vulnerable to #heartbleed vulnerability, which he used to gain access to the administrative account.
The Kali Linux team later tweeted that hacked subdomain was in fact inactive and that it was a 3rd party domain with 0 volume mailing list and hence they were not concerned about the hacking.
Source: Techworm, May 1, 2014.