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https://issues.apache.org/jira/browse/MAPREDUCE-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979863#action_12979863
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Todd Lipcon commented on MAPREDUCE-2252:
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More generally we should probably register a jetty ErrorHandler which escapes
the output of exception traces. org.mortbay.jetty.handler.ErrorHandler is the
default and has this lack of escaping that causes the bug.
> XSS injection in JobHistoryParser
> ---------------------------------
>
> Key: MAPREDUCE-2252
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2252
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Priority: Critical
> Fix For: 0.22.0
>
>
> A malicious user can copy a job history file to another location to which
> both the user and the JT have access to, and then modify the "taskid" field
> of a "TaskStarted" event in the JSON to include a script tag. This will be
> printed unescaped in the 500 error that is produced.
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