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https://issues.apache.org/jira/browse/SPARK-47318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun closed SPARK-47318.
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> AuthEngine key exchange needs additional KDF round
> ---------------------------------------------------
>
> Key: SPARK-47318
> URL: https://issues.apache.org/jira/browse/SPARK-47318
> Project: Spark
> Issue Type: Bug
> Components: Security
> Affects Versions: 3.4.0, 3.5.0, 4.0.0
> Reporter: Steve Weis
> Assignee: Steve Weis
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.5.2, 3.4.3, 4.0.0
>
>
> AuthEngine implements a bespoke [key exchange protocol
> |[https://github.com/apache/spark/tree/master/common/network-common/src/main/java/org/apache/spark/network/crypto]|https://github.com/apache/spark/tree/master/common/network-common/src/main/java/org/apache/spark/network/crypto].]
> based on the NNpsk0 Noise pattern and using X25519.
> The Spark code improperly uses the derived shared secret directly, which is
> an encoded X coordinate. This should be passed into a KDF rather than used
> directly.
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