[jira] [Commented] (WW-4146) cache attack at OgnlUtil.expressions

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14034986#comment-14034986 ] 

ASF GitHub Bot commented on WW-4146:
------------------------------------

Github user lukaszlenart commented on a diff in the pull request:

    https://github.com/apache/struts/pull/12#discussion_r13902929
  
    --- Diff: xwork-core/src/main/java/com/opensymphony/xwork2/ognl/OgnlUtil.java ---
    @@ -279,7 +279,8 @@ public Object compile(String expression) throws OgnlException {
                 if (tree == null) {
                     tree = Ognl.parseExpression(expression);
                     checkEnableEvalExpression(tree, context);
    -                expressions.putIfAbsent(expression, tree);
    +//                duplicated cache put
    +//                expressions.putIfAbsent(expression, tree);
    --- End diff --
    
    Remove the code, not comment it out


> 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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