Directory traversal vulnerability in the file output plugin in Elasticsearch Logstash before 1.4.3 allows remote attackers to write to arbitrary files via vectors related to dynamic field references in the path option.
https://www.elastic.co/community/security/
https://www.elastic.co/blog/logstash-1-4-3-released
http://www.securityfocus.com/archive/1/535725/100/0/threaded
http://packetstormsecurity.com/files/132233/Logstash-1.4.2-Directory-Traversal.html