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From "Uwe Schindler (JIRA)" <>
Subject [jira] [Updated] (SOLR-2631) PingRequestHandler can infinite loop if called with a qt that points to itsself
Date Fri, 01 Jul 2011 20:45:28 GMT


Uwe Schindler updated SOLR-2631:

    Attachment: SOLR-2631.patch

This patch fixes the bug.

Hoss said, we could also simply check the qt param but I decided to do the instanceof check:
If the PingRequestHandler is registered multiple times in the solrconfig.xml (e.g. by different
URI paths or different names), the infinite loop could still occur. The PingRequestHandler
should generally disallow calling itsself.

> PingRequestHandler can infinite loop if called with a qt that points to itsself
> -------------------------------------------------------------------------------
>                 Key: SOLR-2631
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>          Components: search, web gui
>    Affects Versions: 1.4, 3.1, 3.2, 3.3
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.4, 4.0
>         Attachments: SOLR-2631.patch
> We got a security report to, that Solr can infinite loop, use
100% CPU and stack overflow, if you execute the following HTTP request: 
> - http://localhost:8983/solr/select?qt=/admin/ping
> - http://localhost:8983/admin/ping?qt=/admin/ping
> The qt paramter instructs PingRequestHandler to call the given request handler. This
leads to an infinite loop. This is not an security issue, but for an unprotected Solr server
with unprotected /solr/select path this makes it stop working.
> The fix is to prevent infinite loop by disallowing calling itsself.

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