Apache Struts 2 Namespace Redirect OGNL Injection

This module exploits a remote code execution vulnerability in Apache Struts
version 2.3 - 2.3.4, and 2.5 - 2.5.16. Remote Code Execution can be performed
via an endpoint that makes use of a redirect action.

Note that this exploit is dependant on the version of Tomcat running on
the target. Versions of Tomcat starting with 7.0.88 currently don't
support payloads larger than ~7.5kb. Windows Meterpreter sessions on
Tomcat >=7.0.88 are currently not supported.

Native payloads will be converted to executables and dropped in the
server's temp dir. If this fails, try a cmd/* payload, which won't
have to write to the disk.