CVE-2008-1483
OpenSSH 4.3p2, and probably other versions, allows local users to hijack forwarded X connections by causing ssh to set DISPLAY to :10, even when another process is listening on the associated port, as demonstrated by opening TCP port 6010 (IPv4) and sniffing a cookie sent by Emacs.
Date published : 2008-03-24
http://lists.apple.com/archives/security-announce//2008/Sep/msg00005.html