Description
The RPC protocol implementation in Apache Hadoop 2.x before 2.0.6-alpha, 0.23.x before 0.23.9, and 1.x before 1.2.1, when the Kerberos security features are enabled, allows man-in-the-middle attackers to disable bidirectional authentication and obtain sensitive information by forcing a downgrade to simple authentication.
Remediation
References
http://rhn.redhat.com/errata/RHSA-2014-0037.html
http://rhn.redhat.com/errata/RHSA-2014-0400.html
http://seclists.org/fulldisclosure/2013/Aug/251
http://secunia.com/advisories/57915
https://www.cloudera.com/documentation/other/security-bulletins/topics/csb_topic_1.html
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