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https://issues.apache.org/jira/browse/WW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13996077#comment-13996077
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ASF GitHub Bot commented on WW-4146:
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GitHub user emeroad opened a pull request:
https://github.com/apache/struts/pull/12
[PATCH] WW-4146 Caches only valid Ognl expressions to avoid cache attack
- duplicated cache put
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/emeroad/struts develop
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/struts/pull/12.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #12
----
commit 02a4cff4076e602a010fb232dfc76123f39e3b2d
Author: emeroad <emer...@hanmail.net>
Date: 2014-05-13T05:30:33Z
[PATCH] WW-4146 Caches only valid Ognl expressions to avoid cache attack
- duplicated cache put
----
> 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
> Assignee: Lukasz Lenart
> Fix For: 2.3.18
>
> Attachments: WW-4146.patch
>
>
> 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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