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https://issues.apache.org/jira/browse/KAFKA-2579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gwen Shapira resolved KAFKA-2579.
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Resolution: Fixed
Fix Version/s: 0.9.0.0
Issue resolved by pull request 240
[https://github.com/apache/kafka/pull/240]
> Unauthorized clients should not be able to join groups
> -------------------------------------------------------
>
> Key: KAFKA-2579
> URL: https://issues.apache.org/jira/browse/KAFKA-2579
> Project: Kafka
> Issue Type: Sub-task
> Components: security
> Affects Versions: 0.9.0.0
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Fix For: 0.9.0.0
>
>
> The JoinGroup authorization is only checked in the response callback which is
> invoked after the request has been forwarded to the ConsumerCoordinator and
> the client has joined the group. This allows unauthorized members to impact
> the rest of the group since the coordinator will assign partitions to them.
> It would be better to check permission and return immediately if the client
> is unauthorized.
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