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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2096) Secure local filesystem IO from symlink vulnerabilities
Date Thu, 06 Jan 2011 18:43:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated MAPREDUCE-2096:
-----------------------------------

      Resolution: Fixed
    Release Note: The TaskTracker now uses the libhadoop JNI library to operate securely on
local files when security is enabled. Secure clusters must ensure that libhadoop.so is available
to the TaskTracker.
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

Committed to trunk and 0.22

> 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
>             Fix For: 0.22.0
>
>         Attachments: mapreduce-2096-index-oob.txt, mapreduce-2096.2.txt, mapreduce-2096.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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