Hello,

Users of Apache Hadoop should be aware of a security vulnerability recently
discovered, as described by the following CVE. In particular, please note
the "Users affected", "Versions affected", and "Mitigation" sections.

Best,
Aaron

--
Aaron T. Myers
Software Engineer, Cloudera

CVE-2012-1574: Apache Hadoop user impersonation vulnerability

Severity: Critical

Vendor: The Apache Software Foundation

Versions Affected:
Hadoop 0.20.203.0, 0.20.204.0, and 0.20.205.0
Hadoop 1.0.0 to 1.0.1
Hadoop 0.23.0 to 0.23.1.

Users affected: Users who have enabled Hadoop's Kerberos/MapReduce security
features.

Impact: Vulnerability allows an authenticated malicious user to impersonate
any other user on the cluster.

Mitigation:
0.20.20x.x and 1.0.x users should upgrade to 1.0.2
0.23.x users should upgrade to 0.23.2 when it becomes available

Credit:
This issue was discovered by Aaron T. Myers of Cloudera.