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  1. Solr
  2. SOLR-13669

[CVE-2019-0193] Remote Code Execution via DataImportHandler

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      The DataImportHandler, an optional but popular module to pull in data from databases and other sources, has a feature in which the whole DIH configuration can come from a request's "dataConfig" parameter. The debug mode of the DIH admin screen uses this to allow convenient debugging / development of a DIH config. Since a DIH config can contain scripts, this parameter is a security risk. Starting with version 8.2.0 of Solr, use of this parameter requires setting the Java System property "enable.dih.dataConfigParam" to true.

      Mitigations:

      • Upgrade to 8.2.0 or later, which is secure by default.
      • or, edit solrconfig.xml to configure all DataImportHandler usages with an "invariants" section listing the "dataConfig" parameter set to am empty string.
      • Ensure your network settings are configured so that only trusted traffic communicates with Solr, especially to the DIH request handler. This is a best practice to all of Solr.

      Credits:

      • Michael Stepankin

      References:

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            dsmiley David Smiley
            artsploit Michael Stepankin
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