Description
The ParameterInterceptor component in Apache Struts before 2.3.1.1 does not prevent access to public constructors, which allows remote attackers to create or overwrite arbitrary files via a crafted parameter that triggers the creation of a Java object.
Remediation
References
http://archives.neohapsis.com/archives/bugtraq/2012-01/0031.html
http://struts.apache.org/2.x/docs/s2-008.html
http://struts.apache.org/2.x/docs/version-notes-2311.html
http://secunia.com/advisories/47393
https://www.sec-consult.com/files/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt
http://www.exploit-db.com/exploits/18329