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https://issues.apache.org/struts/browse/WW-2264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_42414
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Jim Cushing commented on WW-2264:
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When I take Hisato's sample code as is, I get a ClassCastException. If I remove
the cast (see below), "[Ljava.lang.String;@4d98b4" prints to the console, but
the rendered JSP still displays "someValue is someValue".
So it looks like SessionUser's local variable 'session' does get changed (it's
trying to set a String array? why?), but THE session (associated with
JSESSIONID) does not.
It still seems like OGNL might be messing around with private variables.
> A session value is overwrited by requesting.
> --------------------------------------------
>
> Key: WW-2264
> URL: https://issues.apache.org/struts/browse/WW-2264
> Project: Struts 2
> Issue Type: Bug
> Components: Value Stack
> Affects Versions: 2.0.9
> Environment: I tested in struts2.0.9
> Reporter: Hisato Killing
> Priority: Critical
> Attachments: s2inject.zip
>
>
> The attacker can inject the given value into session map by clicking
> following URL.
> http://example.com/SomeAction.action?session.somekey=someValue
> [[A session value is overwrited by demanding a browser. ]]
> FROM: [EMAIL PROTECTED]
> TO: struts-dev
> >>>>
> 1.This problem is caused in struts 2.0.9 and others perhaps.
> In that case, it is assumed that it is as follows.
> i. SomeAction is implements SessionAware.
> ii. And It is defined in struts-default.
> iii. devMode is true or false.
> ["someValue"] of the name of "someKey" enters in SessionMap when the
> request shown in that URL is processed.
> It is meant that ["someValue"] is an array including "someValue".
> This causes ClassCastException in case of almost.
> [EMAIL PROTECTED]
> It is thought that this only has to be my mistake ,setting etc.
> Thanks
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