Vendor: Elasticsearch Product: Logstash CVE: CVE-2014-4326 Affected versions: Logstash 1.0.14 through 1.4.1 Recommendations: All affected users should upgrade to Logstash 1.4.2. We also provide patch instructions for Logstash 1.3.x at the bottom of this note. The vulnerability impacts deployments that use either the zabbix or the nagios_nsca outputs. In these cases, an attacker with an ability to send crafted events to any source of data for Logstash could execute operating system commands with the permissions of the Logstash process. Deployments that do not use the zabbix or the nagios_nsca outputs are not vulnerable and do not need to upgrade for this reason. We would like to thank Jan Karwowski and Danila Borisiuk for reporting the issue and working with us on the resolution. Related links: http://www.elasticsearch.org/blog/logstash-1-4-2/ Logstash 1.3.x patch instructions: mkdir -p /tmp/logstash-patch/logstash/ outputs wget -O /tmp/logstash-patch/logstash/outputs/zabbix.rb https://github.com/elasticsearch/logstash-contrib/raw/v1.4.2/lib/logstash/outputs/zabbix.rb wget -O /tmp/logstash-patch/logstash/outputs/nagios_nsca.rb https://github.com/elasticsearch/logstash/raw/v1.4.2/lib/logstash/outputs/nagios_nsca.rb jar uf logstash-1.3.3-flatjar.jar -C /tmp/logstash-patch/ logstash/outputs/zabbix.rb -C /tmp/logstash-patch/ logstash/outputs/nagios_nsca.rb SHA256 of the two files fetched for this patch process: 9f86c2ba1940d507f54fffee209bbdcf43a658973c99c2f8bded1e36b31c21d7 ./logstash/outputs/zabbix.rb 2982178fabbf3de5d40e9bbfb1320d3466338371611d77e22804d21caa8e135f ./logstash/outputs/nagios_nsca.rb