[jira] [Resolved] (KAFKA-14063) Kafka message parsing can cause ooms with small antagonistic payloads

["Manikumar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-14063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Manikumar resolved KAFKA-14063.
-------------------------------
    Resolution: Fixed

> Kafka message parsing can cause ooms with small antagonistic payloads
> ---------------------------------------------------------------------
>
>                 Key: KAFKA-14063
>                 URL: https://issues.apache.org/jira/browse/KAFKA-14063
>             Project: Kafka
>          Issue Type: Bug
>          Components: generator
>    Affects Versions: 3.2.0
>            Reporter: Daniel Collins
>            Priority: Major
>             Fix For: 2.8.2, 3.2.3, 3.1.2, 3.0.2
>
>
> When parsing code receives a payload for a variable length field where the length is specified in the code as some arbitrarily large number (assume INT32_MAX for example) this will immediately try to allocate an ArrayList to hold this many elements, before checking whether this is a reasonable array size given the available data. 
> The fix for this is to instead throw a runtime exception if the length of a variably sized container exceeds the amount of remaining data. Then, the worst a user can do is force the server to allocate 8x the size of the actual delivered data (if they claim there are N elements for a container of Objects (i.e. not a byte string) and each Object bottoms out in an 8 byte pointer in the ArrayList's backing array).
> This was identified by fuzzing the kafka request parsing code.



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