Apache Struts 2 DefaultActionMapper Prefixes OGNL Code Execution

Description
  • The Struts 2 DefaultActionMapper supports a method for short-circuit navigation state changes by prefixing parameters with "action:" or "redirect:", followed by a desired navigational target expression. This mechanism was intended to help with attaching navigational information to buttons within forms. <br/><br/> In Struts 2 before 2.3.15.1 the information following "action:", "redirect:" or "redirectAction:" is not properly sanitized. Since said information will be evaluated as OGNL expression against the value stack, this introduces the possibility to inject server side code. <br/><br/> Affected Software:<br/> Struts 2.0.0 - Struts 2.3.15
Remediation
  • Developers should immediately upgrade to Struts 2.3.15.1
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