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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3418
            A vulnerability has been identified in Apache Solr
                             10 September 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Apache Solr
Publisher:         The Apache Software Foundation
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 
   https://issues.apache.org/jira/browse/SOLR-13750

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Severity: Medium

Vendor: The Apache Software Foundation

Versions Affected:

1.3.0 to 1.4.1

3.1.0 to 3.6.2

4.0.0 to 4.10.4

Description:

Solr versions prior to 5.0.0 are vulnerable to an XML resource consumption 
attack (a.k.a. Lol Bomb) via its update handler.

By leveraging XML DOCTYPE and ENTITY type elements, the attacker can create a
pattern that will expand when the server parses the XML causing OOMs.

Mitigation:

Upgrade to Apache Solr 5.0 or later.

Ensure your network settings are configured so that only trusted traffic is 
allowed to post documents to the running Solr instances.

Credit:

Matei "Mal" Badanoiu

References:

[1] https://issues.apache.org/jira/browse/SOLR-13750

[2] https://wiki.apache.org/solr/SolrSecurity

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