[
https://issues.apache.org/jira/browse/WW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13949766#comment-13949766
]
ASF subversion and git services commented on WW-4146:
-----------------------------------------------------
Commit 86813c1a7214bc002a5d7ce9981a9ef333e27142 in struts's branch
refs/heads/develop from [~lukaszlenart]
[ https://git-wip-us.apache.org/repos/asf?p=struts.git;h=86813c1 ]
WW-4146 Caches only valid Ognl expressions to avoid cache attack
> 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: 2.3.17
>
> 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 .
--
This message was sent by Atlassian JIRA
(v6.2#6252)
