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Date: Mon, 30 Dec 2019 08:11:44 -0500
From: Erik Hatcher <erik.hatcher@...il.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2019-17558] Apache Solr RCE through VelocityResponseWriter
[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 (.vm) 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.
Credits: Github user `s00py`
References:
* https://cwiki.apache.org/confluence/display/solr/SolrSecurity
* https://issues.apache.org/jira/browse/SOLR-13971
* https://issues.apache.org/jira/browse/SOLR-14025
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