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Posted to mapreduce-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2010/09/28 21:48:33 UTC

[jira] Created: (MAPREDUCE-2096) Secure local filesystem IO from symlink vulnerabilities

Secure local filesystem IO from symlink vulnerabilities
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                 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


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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