Server side object manipulation in Apache Struts

OGNL provides, among other features, extensive expression evaluation capabilities. This vulnerability allows a malicious user to bypass the ''-usage protection built into the ParametersInterceptor, thus being able to manipulate server side context objects. This behavior was already addressed in...

CVE-2010-1870: Undefined Security Weakness

The OGNL extensive expression evaluation capability in XWork in Struts 2.0.0 through 2.1.8.1, as used in Atlassian Fisheye, Crucible, and possibly other products, uses a permissive whitelist, which allows remote attackers to modify server-side context objects and bypass the "" protection mechanis...