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CVE-2019-17558

Status Candidate

Overview

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).

Related Files

Apache Solr 8.3.0 Velocity Template Remote Code Execution
Posted Apr 3, 2020
Authored by Imran Dawoodjee, JAS502N, s00py, AleWong | Site metasploit.com

This Metasploit module exploits a vulnerability in Apache Solr versions 8.3.0 and below which allows remote code execution via a custom Velocity template. Currently, this module only supports Solr basic authentication. From the Tenable advisory: An attacker could target a vulnerable Apache Solr instance by first identifying a list of Solr core names. Once the core names have been identified, an attacker can send a specially crafted HTTP POST request to the Config API to toggle the params resource loader value for the Velocity Response Writer in the solrconfig.xml file to true. Enabling this parameter would allow an attacker to use the Velocity template parameter in a specially crafted Solr request, leading to remote code execution.

tags | exploit, remote, web, code execution
advisories | CVE-2019-17558
SHA-256 | 04c5dd5b8815196c9a380f26b4389f5a970acbe465ccd84df68c9cd5c9543808
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