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https://issues.apache.org/jira/browse/MAPREDUCE-2096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918656#action_12918656
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Devaraj Das commented on MAPREDUCE-2096:
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bq. This patch fixes the above issue by having TaskRunner call to a version of
reportDiagonsticInfo that doesn't authorize the caller.
The same should be done for fsError.
> Secure local filesystem IO from symlink vulnerabilities
> -------------------------------------------------------
>
> Key: MAPREDUCE-2096
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2096
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker, security, tasktracker
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Blocker
> Attachments: secure-files-9.txt, secure-files-authorized-jvm-fix.txt
>
>
> This JIRA is to contribute a patch developed on the private security@ mailing
> list.
> The vulnerability is that MR daemons occasionally open files that are located
> in a path where the user has write access. A malicious user may place a
> symlink in place of the expected file in order to cause the daemon to instead
> read another file on the system -- one which the attacker may not naturally
> be able to access. This includes delegation tokens belong to other users, log
> files, keytabs, etc.
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