Description
The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter values as OGNL expressions during certain exception handling for mismatched data types of properties, which allows remote attackers to execute arbitrary Java code via a crafted parameter.
Remediation
References
http://archives.neohapsis.com/archives/bugtraq/2012-01/0031.html
http://secunia.com/advisories/47393
http://struts.apache.org/2.x/docs/s2-008.html
http://struts.apache.org/2.x/docs/version-notes-2311.html
http://www.exploit-db.com/exploits/18329
https://issues.apache.org/jira/browse/WW-3668
https://www.sec-consult.com/files/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt