Logstash 1.5.3 and prior versions are vulnerable to a SSL/TLS security issue which allows an attacker to successfully implement a man in the middle attack. This vulnerability is not present in the initial installation of Logstash. This insecurity is exposed when users configure Lumberjack output to connect two Logstash instances. In such deployments, a Logstash instance is used to collect logs from a webserver and securely transmit them to a central Logstash instance to perform additional filtering and storing.
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Logstash 1.5.2 and prior versions are vulnerable to a SSL/TLS security issue called the FREAK attack. If you are using the Lumberjack input, FREAK allows an attacker to successfully implement a man in the middle attack, intercepting communication between the Logstash Forwarder agent and Logstash server.
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Logstash versions 1.4.2 and prior are vulnerable to a directory traversal attack that allows an attacker to overwrite files on the server running Logstash.
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Elasticsearch Logstash versions 1.0.14 through 1.4.1 suffer from a remote command execution vulnerability.
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