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https://issues.apache.org/jira/browse/HDFS-16766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HDFS-16766:
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Summary: hdfs ec command loads (administrator provided) erasure code policy
files without disabling xml entity expansion (was: XML External Entity (XXE)
attacks can occur while processing XML received from an untrusted source)
> hdfs ec command loads (administrator provided) erasure code policy files
> without disabling xml entity expansion
> ---------------------------------------------------------------------------------------------------------------
>
> 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
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.5, 3.2.5
>
>
> 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
> h3. sonatype-2022-5732
> If anyone is landing on this page following the sonatype-2022-5732 alert
> # the xml expansion only happens on the command line of the {{hdfs ec))
> command
> https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/HDFSErasureCoding.html#Administrative_commands
> # the outcome of entity expansion will be the command failing/running out of
> memory
> # if you cluster admin is loading erasure policies from untrusted sources,
> there are fundamental process issues to worry about beyond xml references
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