Description
Apache Struts 2.3.19 to 2.3.20.2, 2.3.21 to 2.3.24.1, and 2.3.25 to 2.3.28, when Dynamic Method Invocation is enabled, allow remote attackers to execute arbitrary code via vectors related to an ! (exclamation mark) operator to the REST Plugin.
Remediation
References
http://struts.apache.org/docs/s2-033.html
http://www.securityfocus.com/bid/90960
http://www.securitytracker.com/id/1036017
http://www-01.ibm.com/support/docview.wss?uid=swg21987854
https://www.exploit-db.com/exploits/39919/