bruce liu created WW-4146:
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Summary: cache attack at OgnlUtil.expressions
Key: WW-4146
URL: https://issues.apache.org/jira/browse/WW-4146
Project: Struts 2
Issue Type: Bug
Components: Core Actions
Affects Versions: 2.3.15.1
Reporter: bruce liu
Priority: Critical
in class com.opensymphony.xwork2.ognl.OgnlUtil, code :
tree = expressions.get(expression);
if (tree == null) {
tree = Ognl.parseExpression(expression);
expressions.putIfAbsent(expression, tree);
}
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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