Weiwei Yang resolved AMBARI-18632.
    Resolution: Later

> Security flaw with adding dr.who into yarn.admin.acl  while enabling kerberos
> -----------------------------------------------------------------------------
>                 Key: AMBARI-18632
>                 URL: https://issues.apache.org/jira/browse/AMBARI-18632
>             Project: Ambari
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.3.0, 2.2.0, 2.4.0
>            Reporter: Weiwei Yang
>            Priority: Major
> AMBARI-12415 introduces a major security hole to a secure cluster, it adds 
> *dr.who* into *yarn.admin.acl*, which grants yarn admin permission to an 
> anonymous user. It should be reverted. 
> There is an alternative way of fixing this, see more in HADOOP-13707. Http 
> service could be non-secure in a kerberized environment, when 
> hadoop.http.authentication.type=simple, under this situation, the fix of 
> HADOOP-13707 skips admin checks for static user dr.who. 

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