1 Vulnerability Overview
Recently, Apache Software Foundation (ASF) issued a security bulletin to announce the fix of the remote arbitrary code execution vulnerability (CVE-2019-0193) in Apache Solr. This vulnerability exists in the DataImportHandler module, a common module used to import data from databases or other sources. The whole DIH configuration of this module can come from the dataConfig parameter included in an external request. As a DIH configuration can contain scripts, this parameter is a security risk.
An attacker could exploit this vulnerability to cause arbitrary code execution via a malicious request that contains a carefully crafted dataConfig parameter. Users of this software are advised to upgrade Apache Solr to a secure version to protect against this vulnerability.
2 Scope of Impact
- Apache Solr < 8.2.0
- Apache Solr >= 8.2.0
3 Vulnerability Detection
User can check the current Solr version on the Solr administration dashboard. If the current version is affected and lacks the related protection configuration, this version is vulnerable and users are advised to take protection measures as soon as possible.
4.1 Official Fix
Starting with Solr 8.2.0, the use of the dataConfig parameter requires setting the Java system property “enable.dih.dataconfigparam” to “true”. Users can upgrade Solr to 8.2.0 or later to protect against this vulnerability:
Download link: http://lucene.apache.org/solr/downloads.html
- Users can edit solrconfig.xml to configure all DataImportHandler usages with an “invariants” section listing the “dataConfig” parameter set to an empty string.
- Ensure that network settings are configured so that only trusted traffic communicates with Solr, especially to the DIH request handler.
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