Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| org.apache.solr:solr-core | ≥ 5.0.0, < 8.4.0≥ 6.0.0, < 8.4.0≥ 7.0.0, < 8.4.0≥ 8.0.0, < 8.4.0 | 8.4.0 |
| solr | ≥ 5.0.0, < 7.7.3≥ 8.0.0, < 8.4.0 | 7.7.38.4.0 |
| primavera unifier | = 16.1= 16.2= 18.8= 19.12≥ 17.7, ≤ 17.12 |
Apache Solr 5.0.0 to Apache Solr 8.3.1 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).
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