Date: Mon, 9 Sep 2019 15:04:33 -0700 From: Tomas Fernandez Lobbe <tflobbe@...che.org> To: oss-security@...ts.openwall.com Subject: [SECURITY] CVE-2019-12401: XML Bomb in Apache Solr versions prior to 5.0 Severity: Medium Vendor: The Apache Software Foundation Versions Affected: 1.3.0 to 1.4.1 3.1.0 to 3.6.2 4.0.0 to 4.10.4 Description: Solr versions prior to 5.0.0 are vulnerable to an XML resource consumption attack (a.k.a. Lol Bomb) via it’s update handler. By leveraging XML DOCTYPE and ENTITY type elements, the attacker can create a pattern that will expand when the server parses the XML causing OOMs Mitigation: * Upgrade to Apache Solr 5.0 or later. * Ensure your network settings are configured so that only trusted traffic is allowed to post documents to the running Solr instances. Credit: Matei "Mal" Badanoiu References:  https://issues.apache.org/jira/browse/SOLR-13750  https://wiki.apache.org/solr/SolrSecurity
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