Package Instance

XWork ParameterInterceptors bypass allows remote command execution
The OGNL extensive expression evaluation capability in this package as used in Atlassian Fisheye, Crucible, and possibly other products, uses a permissive allowlist, which allows remote attackers to modify server-side context objects and bypass the "#" protection mechanism in ParameterInterceptors via the `#context`, `#_memberAccess`, `#root`, `#this`, `#_typeResolver`, `#_classResolver`, `#_traceEvaluations`, `#_lastEvaluation`, `#_keepLastEvaluation`, and possibly other OGNL context variables, a different vulnerability than CVE-2008-6504.

Struts ParameterInterceptor vulnerability allows remote command execution
Regular expression in ParametersInterceptor matches `top['foo'](0)` as a valid expression, which OGNL treats as `(top['foo'])(0)` and evaluates the value of 'foo' action parameter as an OGNL expression. This lets malicious users put arbitrary OGNL statements into any String variable exposed by an action and have it evaluated as an OGNL expression and since OGNL statement is in HTTP parameter value attacker can use blacklisted characters (e.g. #) to disable method execution and execute arbitrary methods, bypassing the ParametersInterceptor and OGNL library protections.