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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1959 CVE-2018-8026: XXE vulnerability due to Apache Solr configset upload 6 July 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Solr Publisher: Apache Foundation Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Access Confidential Data -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2018-8026 Reference: ESB-2018.1546 Original Bulletin: https://issues.apache.org/jira/browse/SOLR-12450 - --------------------------BEGIN INCLUDED TEXT-------------------- CVE-2018-8026: XXE vulnerability due to Apache Solr configset upload (exchange rate provider config / enum field config / TIKA parsecontext) Severity: High Vendor: The Apache Software Foundation Versions Affected: Solr 6.0.0 to 6.6.4 Solr 7.0.0 to 7.3.1 Description: The details of this vulnerability were reported by mail to the Apache security mailing list. This vulnerability relates to an XML external entity expansion (XXE) in Solr config files (currency.xml, enumsConfig.xml referred from schema.xml, TIKA parsecontext config file). In addition, Xinclude functionality provided in these config files is also affected in a similar way. The vulnerability can be used as XXE using file/ftp/http protocols in order to read arbitrary local files from the Solr server or the internal network. The manipulated files can be uploaded as configsets using Solr's API, allowing to exploit that vulnerability. See [1] for more details. Mitigation: Users are advised to upgrade to either Solr 6.6.5 or Solr 7.4.0 releases both of which address the vulnerability. Downloads are available at [2]. Once upgrade is complete, no other steps are required. Those releases only allow external entities and Xincludes that refer to local files / zookeeper resources below the Solr instance directory (using Solr's ResourceLoader); usage of absolute URLs is denied. Keep in mind, that external entities and XInclude are explicitly supported to better structure config files in large installations. Before Solr 6 this was no problem, as config files were not accessible through the APIs. If users are unable to upgrade to Solr 6.6.5 or Solr 7.4.0 then they are advised to make sure that Solr instances are only used locally without access to public internet, so the vulnerability cannot be exploited. In addition, reverse proxies should be guarded to not allow end users to reach the configset APIs. Please refer to [3] on how to correctly secure Solr servers. Solr 5.x and earlier are not affected by this vulnerability; those versions do not allow to upload configsets via the API. Nevertheless, users should upgrade those versions as soon as possible, because there may be other ways to inject config files through file upload functionality of the old web interface. Those versions are no longer maintained, so no deep analysis was done. Credit: Yuyang Xiao, Ishan Chattopadhyaya References: [1] https://issues.apache.org/jira/browse/SOLR-12450 [2] https://lucene.apache.org/solr/downloads.html [3] https://wiki.apache.org/solr/SolrSecurity - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWz7dHGaOgq3Tt24GAQja8A//eG41fvPktRzxhE6yO2k7+jX2w++iGS/P sD4LkIhPg95xJQttPrEsr1et0mTvLFdp4iBIMRe/dR99YkyyunKEwZS85jQbY2zU aH/NcjjDH0o1nLccnDxkk31WnhqMPjnA3HbfJOq06Xk/wo232q42Ge05Bd+5Rnms CEwevc7+Oek91Ogr3bWH4C7ALbiPXMk2Q+td5Wy2BllC/3yXFwSxxvZQuP7Qwa8i t2wJmspEV0d9Gvd7+FQAQx2eB6HIO0A5h3mWUn8ALNBZ0f5/MQ/8hKR1sEasWvJk nfJeQPpEaBD12yjpjor5DCOzobMxUILtW4ApRI2saadbRBWNjFlfsXflZgUWyEzA fIykRwJC4RqsQh8bCa5W8JArOzke0p5Ih0JiyW1TOzSGYzAfx+jzUUtf9lutxMO3 M7T+Ozafpfe/ovfOODL3E/AKBahzbpaUotxM5XYaAgpT/Fy8ASi0hKwVeNiaLJaK DflteTdQkbUbENDTrSUDpurcSWs7L3BqiJgSdqUuNxu2TEIJHQX0H3ZmqJo6kdRw yWsl7DklsJjEcCVe5+/T6iEazv8LoY/Pu5QpNn28Tq9ox1vYeEXW6OwKzudkvyxQ 5w/BwyXlLzUZ3/dRzd024Frr6c/1/v6oT8Fe2MuGjwrAiqYUkTpdeeJ8OYvchXwc LbtncLY60BI= =S99W -----END PGP SIGNATURE-----