Apache Hadoop versions prior to 2.0.6-alpha, 0.23.9, and 1.2.1 suffer from a man in the middle vulnerability…. Apache Hadoop versions prior to 2.0.6-alpha, 0.23.9, and 1.2.1 suffer from a man in the middle vulnerability.

Read more http://packetstormsecurity.com/files/122951/CVE-2013-2192.txt