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https://issues.apache.org/jira/browse/SOLR-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137204#comment-13137204
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Erik Hatcher commented on SOLR-2854:
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bq. Definitely should be investigated... exception being swallowed somewhere?
getStream() being called more than once?
No exception or multiple getStream() calls. Turns out the metadata attributes
(which are ignored in the example /update/extract config) were being set to
null (as evidenced by stepping through with a debugger attached). The latest
patch fixes this. All seems to be well otherwise in investigating the use of
other content stream usage where getStream() is called first. I'm going to
commit this patch and add a comment to the getStream() method to note that it
should be called before the other properties.
> Limit remote streaming to update handlers
> -----------------------------------------
>
> Key: SOLR-2854
> URL: https://issues.apache.org/jira/browse/SOLR-2854
> Project: Solr
> Issue Type: Improvement
> Reporter: David Smiley
> Assignee: Erik Hatcher
> Labels: security
> Attachments: SOLR-2854-delay-stream-opening.patch,
> SOLR-2854-extract_fix.patch,
> SOLR-2854_test_remote_streaming_not_done_on_select.patch
>
>
> I think the remote streaming feature should be limited to update request
> processors. I'm not sure if there is even any use of using it on a /select,
> but even if there is, it's an unintended security risk. Observe this URL
> that is roughly the equivalent of an SQL injection attack:
> http://localhost:8983/solr/select?q=*:*&indent=on&wt=ruby&rows=2&stream.url=http%3A%2F%2Flocalhost%3A8983%2Fsolr%2Fupdate%3Fcommit%3Dtruetream.body%3D%3Cdelete%3E%3Cquery%3E*%3A*%3C%2Fquery%3E%3C%2Fdelete%3E
> Yep; that's right -- this *search* deletes all the data in your Solr
> instance! If you blocked off access to /update* based on IP then that isn't
> good enough.
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