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Date: Fri, 19 Jul 2013 10:42:50 +0000 (UTC)
From: "Lukasz Lenart (JIRA)" <jira@apache.org>
To: issues@struts.apache.org
Message-ID: <JIRA.12658709.1374222228810.80612.1374230570357@arcas>
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Subject: [jira] [Commented] (WW-4146) cache attack at  OgnlUtil.expressions
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    [ https://issues.apache.org/jira/browse/WW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713533#comment-13713533 ] 

Lukasz Lenart commented on WW-4146:
-----------------------------------

Hm... but thus will slow down processing of request for common values, ie index.action?user=foo&pass=bar
                
> cache attack at  OgnlUtil.expressions
> -------------------------------------
>
>                 Key: WW-4146
>                 URL: https://issues.apache.org/jira/browse/WW-4146
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Expression Language
>    Affects Versions: 2.3.15.1
>            Reporter: bruce liu
>             Fix For: 2.3.17
>
>
> in class com.opensymphony.xwork2.ognl.OgnlUtil, code :
> {code:java}
> tree = expressions.get(expression);
> if (tree == null) {
> 	tree = Ognl.parseExpression(expression);
> 	expressions.putIfAbsent(expression, tree);
> }
> {code}
> every parameter in the request cached in  field expressions  which is an instances of ConcurrentMap<String, Object>, use parameterName as key. so i construct huge different parameters that has different name (like  "abc[123],  abc[124]" ), they all cached in  expressions, this cause outofmemory error, and let map acted like a list .

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