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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2096) Secure local filesystem IO from symlink vulnerabilities
Date Fri, 03 Dec 2010 23:50:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966737#action_12966737

Devaraj Das commented on MAPREDUCE-2096:

bq. Does anyone have a suggestion on how to get common's native library build onto mapreduce's
library path post-split?

Do we need it immediately? I believe we don't have any MR tests with security ON. If that
is the case, we could go ahead with a MR patch that is not dependent on the native libs (HADOOP-6978).

> 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: mapreduce-2096-index-oob.txt, 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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