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https://issues.apache.org/jira/browse/SOLR-8262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057214#comment-15057214
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Jason Gerlowski commented on SOLR-8262:
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For the sake of history:
This JIRA was resolved by the commits mentioned in the comments above.
The underlying security issue was then fixed, and the stream handlers were
uncommented in SOLR-8266.
> Comment out /stream handler from sample solrconfig.xml's for security reasons
> -----------------------------------------------------------------------------
>
> Key: SOLR-8262
> URL: https://issues.apache.org/jira/browse/SOLR-8262
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
>
> Solr has apache commons-collections in it's classpath.
> *This makes it vulnerable to this security issue
> https://issues.apache.org/jira/browse/COLLECTIONS-580.
> *The /stream handler uses Java serialization for RPC since Solr 5.1.
> These two combined leave a security hole in Solr that allows arbitrary code
> to be executed on the server.
> This ticket will comment out the /stream handler from the sample
> solrconfig.xml's and add a warning to explain the vulnerability.
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