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AUSCERT External Security Bulletin Redistribution
Apache Solr RCE through VelocityResponseWriter
2 March 2020
AusCERT Security Bulletin Summary
Product: Apache Solr
Publisher: The Apache Software Foundation
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2019-17558
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2019-12-30, CVE-2019-17558: Apache Solr RCE through VelocityResponseWriter
Vendor: The Apache Software Foundation
Versions Affected: 5.0.0 to 8.3.1
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).
Ensure your network settings are configured so that only trusted traffic
communicates with Solr, especially to the configuration APIs.
Github user s00py
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