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.
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.
Affected Software:
Struts 2.0.0 - Struts 2.3.15
Remediation
Developers should immediately upgrade to Struts 2.3.15.1
References
Related Vulnerabilities
Python object deserialization of user-supplied data
Ruby Improper Input Validation Vulnerability (CVE-2008-3657)
PostgreSQL Improper Input Validation Vulnerability (CVE-2019-10210)
PHP Improper Input Validation Vulnerability (CVE-2015-8879)
Rukovoditel Improper Input Validation Vulnerability (CVE-2020-11819)