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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2656 CVE-2017-12629: Several critical vulnerabilities discovered in Apache Solr (XXE & RCE) 20 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Apache Solr Publisher: Apache Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-12629 Original Bulletin: https://lucene.apache.org/solr/news.html#12-october-2017-please-secure-your-apache-solr-servers-since-a-zero-day-exploit-has-been-reported-on-a-public-mailing-list - --------------------------BEGIN INCLUDED TEXT-------------------- CVE-2017-12629: Several critical vulnerabilities discovered in Apache Solr (XXE & RCE) Severity: Critical Vendor: The Apache Software Foundation Versions Affected: Solr 5.5.0 to 5.5.4 Solr 6.0.0 to 6.6.1 Solr 7.0.0 to 7.0.1 Description: The details of this vulnerability were reported on public mailing lists. See https://s.apache.org/FJDl The first vulnerability relates to XML external entity expansion in the XML Query Parser which is available, by default, for any query request with parameters deftype=xmlparser. This can be exploited to upload malicious data to the /upload request handler. It can also be used as Blind XXE using ftp wrapper in order to read arbitrary local files from the solr server. The second vulnerability relates to remote code execution using the RunExecutableListener available on all affected versions of Solr. At the time of the above report, this was a 0-day vulnerability with a working exploit affecting the versions of Solr mentioned in the previous section. However, mitigation steps were announced to protect Solr users the same day. See https://lucene.apache.org/solr/news.html#12-october-2017-please-secure-your-apache-solr-servers-since-a-zero-day-exploit-has-been-reported-on-a-public-mailing-list Mitigation: Users are advised to upgrade to either Solr 6.6.2 or Solr 7.1.0 releases both of which address the two vulnerabilities. Once upgrade is complete, no other steps are required. If users are unable to upgrade to Solr 6.6.2 or Solr 7.1.0 then they are advised to restart their Solr instances with the system parameter `-Ddisable.configEdit=true`. This will disallow any changes to be made to your configurations via the Config API. This is a key factor in this vulnerability, since it allows GET requests to add the RunExecutableListener to your config. Users are also advised to re-map the XML Query Parser to another parser to mitigate the XXE vulnerability. For example, adding the following to the solrconfig.xml file re-maps the xmlparser to the edismax parser: <queryParser name="xmlparser" class="solr.ExtendedDismaxQParserPlugin"/> Credit: Michael Stepankin (JPMorgan Chase) Olga Barinova (Gotham Digital Science) References: https://issues.apache.org/jira/browse/SOLR-11482 https://issues.apache.org/jira/browse/SOLR-11477 https://wiki.apache.org/solr/SolrSecurity - -- Regards, Shalin Shekhar Mangar. - --------------------------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. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWelJaYx+lLeg9Ub1AQh2/BAAi1PhMFqwDwmknKWINdmhXvu6E1aZoER8 5ZcSXsPxaZNsvVliBnob0HiCL/tVW6sbkxKiW01poRQ6eL0aqWnN4hc/Kr/sol1c qKcMxPi9K9Au/OaYYUv2wYMuAdewsP75JdSJBQkwj4c8Ft6XH7DpRYKUfsRKaRhU j4+uDyC+I/MnOaaXea1JiasqRwDXkQbr/uOa6mSOhVt0Eunn+JlmLNohNhv+d2NY msBa4cC2Wo3vFR33xeV5q91iPU1rVfee0FW5lXdNrODWfs/jXKZRnRyExVBhlhVc iwfgFPLoM523TBJWJTTs8pPrbxQshRF1Yi5axXve8gvqbHSj/zwd5zKn4Obc0sOq a8RXpLRR6KPSnYGL/TLfxCK5oVRC5lyDN2dW41K+TFWAMLBfl3jUrIXBCIxPKPad WjBCI0VBRwZn6DOiSbVmuR8ok6BpRnZ32Avns/jdaV+VQhmmdhU/7j66/b1vSYJw CYIwQKa295at9Eh5FSkKyIEgtBBPjZF0Hyubjfy6HlSkona/LNsOvxnqIMQKLjTW L3F/dzjD4uCYCcjTrSWgo83StrckZ4NkheqnYNMD8sMbWAQUHDgVa53wOLRDsWGK 2ajxppz9SPT2Dh04lwZeFOy2PVSvA+p75Kim4YlgOnpNeEEgeVti0pRJ1LshxqPe /izsTm+P0WQ= =Udq4 -----END PGP SIGNATURE-----