[jira] [Created] (KAFKA-5062) Kafka brokers can accept malformed requests which allocate gigabytes of memory

["Apurva Mehta (JIRA)" <ji...@apache.org>]

Apurva Mehta created KAFKA-5062:
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             Summary: Kafka brokers can accept malformed requests which allocate gigabytes of memory
                 Key: KAFKA-5062
                 URL: https://issues.apache.org/jira/browse/KAFKA-5062
             Project: Kafka
          Issue Type: Bug
            Reporter: Apurva Mehta


In some circumstances, it is possible to cause a Kafka broker to allocate massive amounts of memory by writing malformed bytes to the brokers port. 

In investigating an issue, we saw byte arrays on the kafka heap upto 1.8 gigabytes, the first 360 bytes of which were non kafka requests -- an application was writing the wrong data to kafka, causing the broker to interpret the request size as 1.8GB and then allocate that amount. Apart from the first 360 bytes, the rest of the 1.8GB byte array was null. 

We have a socket.request.max.bytes set at 100MB to protect against this kind of thing, but somehow that limit is not always respected. We need to investigate why and fix it.

cc [~rnpridgeon], [~ijuma], [~gwenshap], [~cmccabe]





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