The default configuration of the pam_xauth module forwards MIT-Magic-Cookies to new X sessions, which could allow local users to gain root privileges by stealing the cookies from a temporary .xauth file, which is created with the original user's credentials after root uses su.
- http://marc.info/?l=bugtraq&m=104431622818954&w=2
- http://www.kb.cert.org/vuls/id/911505
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