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From "Jasper Rosenberg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (WW-4486) Default parameter exclusions blocking legitimate values
Date Wed, 08 Apr 2015 11:43:12 GMT
Jasper Rosenberg created WW-4486:
------------------------------------

             Summary: Default parameter exclusions blocking legitimate values
                 Key: WW-4486
                 URL: https://issues.apache.org/jira/browse/WW-4486
             Project: Struts 2
          Issue Type: Bug
          Components: Core Interceptors
    Affects Versions: 2.3.23
            Reporter: Jasper Rosenberg
            Priority: Critical


In ParametersInterceptor.setParameters(), when building acceptableParameters(), it applies
the check isAcceptableValue not just just to the parameter name, but also to the parameter
value.  This is a huge problem because the default excludedPatterns include phrases that will
come up in normal user form submissions.  

For example, the way I discovered this is that one pattern is "(.*\.|^|.*|\[('|"))\bclass(\.|('|")]|\[).*"

We are a car site, so when a user tried to post a message about a Mercedes M class: "That's
M class. You asked for G class, different beast!"

The "class." at the end of the first sentence was rejected and so their post failed.

What is the reason for applying the exclusion patterns wholesale to the parameter value? 
Is it even necessary at all, or is there some kind of escape character that normally tells
ognl to evaluate an expression in the value, in which case we could check for exclusion pattern
matches just within those?

As it is though, the current solution is going to cause some occasional very peculiar behavior
for developers.  Not sure if this should actually be a blocker bug since the only reasonable
workaround seems to be to hack the ParametersInterceptor locally (since one shouldn't remove
the exclusion patterns in general).



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