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https://issues.apache.org/jira/browse/HDFS-16766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17603850#comment-17603850
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ASF GitHub Bot commented on HDFS-16766:
---------------------------------------

ashutoshcipher opened a new pull request, #4886:
URL: https://github.com/apache/hadoop/pull/4886

   ### Description of PR
   
   XML External Entity (XXE) attacks can occur while processing XML received 
from an untrusted source.
   
   Solution - Change done in this PR disables DTDs regardless of the parser 
type in case the parser changes later to mitigate the issue.
   
   
   ### For code changes:
   
   - [X] Does the title or this PR starts with the corresponding JIRA issue id 
(e.g. 'HADOOP-17799. Your PR title ...')?
   - [ ] Object storage: have the integration tests been executed and the 
endpoint declared according to the connector-specific documentation?
   - [ ] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?
   - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, 
`NOTICE-binary` files?
   
   




> XML External Entity (XXE) attacks can occur while processing XML received 
> from an untrusted source
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-16766
>                 URL: https://issues.apache.org/jira/browse/HDFS-16766
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 3.3.4
>            Reporter: Jing
>            Assignee: Ashutosh Gupta
>            Priority: Major
>
> XML External Entity (XXE) attacks can occur when an XML parser supports XML 
> entities while processing XML received from an untrusted source. The attack 
> resides in XML input containing references to an external entity an is parsed 
> by the weakly configured javax.xml.parsers.DocumentBuilder XML parser.
>  
> https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/ECPolicyLoader.java#L93



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