Description
Remote code execution occurs in Apache Solr before 7.1 with Apache Lucene before 7.1 by exploiting XXE in conjunction with use of a Config API add-listener command to reach the RunExecutableListener class. Elasticsearch, although it uses Lucene, is NOT vulnerable to this. Note that the XML external entity expansion vulnerability occurs in the XML Query Parser which is available, by default, for any query request with parameters deftype=xmlparser and can be exploited to upload malicious data to the /upload request handler or as Blind XXE using ftp wrapper in order to read arbitrary local files from the Solr server. Note also that the second vulnerability relates to remote code execution using the RunExecutableListener available on all affected versions of Solr.
Remediation
References
http://mail-archives.us.apache.org/mod_mbox/www-announce/201710.mbox/%3CCAOOKt51UO_6Vy%3Dj8W%3Dx1pMbLW9VJfZyFWz7pAnXJC_OAdSZubA%40mail.gmail.com%3E
http://openwall.com/lists/oss-security/2017/10/13/1
http://www.securityfocus.com/bid/101261
https://access.redhat.com/errata/RHSA-2017:3123
https://access.redhat.com/errata/RHSA-2017:3124
https://access.redhat.com/errata/RHSA-2017:3244
https://access.redhat.com/errata/RHSA-2017:3451
https://access.redhat.com/errata/RHSA-2017:3452
https://access.redhat.com/errata/RHSA-2018:0002
https://access.redhat.com/errata/RHSA-2018:0003
https://access.redhat.com/errata/RHSA-2018:0004
https://access.redhat.com/errata/RHSA-2018:0005
https://lists.apache.org/thread.html/r140128dc6bb4f4e0b6a39e962c7ca25a8cbc8e48ed766176c931fccc%40%3Cusers.solr.apache.org%3E
https://lists.apache.org/thread.html/r26c996b068ef6c5e89aa59acb769025cfd343a08e63fbe9e7f3f720f%40%3Coak-issues.jackrabbit.apache.org%3E
https://lists.apache.org/thread.html/r3da74965aba2b5f5744b7289ad447306eeb2940c872801819faa9314%40%3Cusers.solr.apache.org%3E
https://lists.apache.org/thread.html/r95df34bb158375948da82b4dfe9a1b5d528572d586584162f8f5aeef%40%3Cusers.solr.apache.org%3E
https://lists.debian.org/debian-lts-announce/2018/01/msg00028.html
https://s.apache.org/FJDl
https://twitter.com/ApacheSolr/status/918731485611401216
https://twitter.com/joshbressers/status/919258716297420802
https://twitter.com/searchtools_avi/status/918904813613543424
https://usn.ubuntu.com/4259-1/
https://www.debian.org/security/2018/dsa-4124
https://www.exploit-db.com/exploits/43009/
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