Apache Solr: Execute Arbitrary Code/Commands -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0757
              Apache Solr RCE through VelocityResponseWriter
                               2 March 2020

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        AusCERT Security Bulletin Summary
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Product:           Apache Solr
Publisher:         The Apache Software Foundation
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2019-17558  

Original Bulletin: 
   https://lucene.apache.org/solr/security.html

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2019-12-30, CVE-2019-17558: Apache Solr RCE through VelocityResponseWriter 

Severity: High

Vendor: The Apache Software Foundation

Versions Affected: 5.0.0 to 8.3.1

Description:

The affected versions are vulnerable to a Remote Code Execution through the
VelocityResponseWriter. A Velocity template can be provided through Velocity
templates in a configset velocity/ directory or as a parameter. A user defined
configset could contain renderable, potentially malicious, templates. Parameter
provided templates are disabled by default, but can be enabled by setting
params.resource.loader.enabled by defining a response writer with that setting
set to true. Defining a response writer requires configuration API access.

Solr 8.4 removed the params resource loader entirely, and only enables the
configset-provided template rendering when the configset is trusted (has been
uploaded by an authenticated user).

Mitigation:

Ensure your network settings are configured so that only trusted traffic
communicates with Solr, especially to the configuration APIs.

Credit:
Github user s00py

References:

  o https://issues.apache.org/jira/browse/SOLR-13971
  o https://issues.apache.org/jira/browse/SOLR-14025
  o https://cwiki.apache.org/confluence/display/SOLR/SolrSecurity

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