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.
| Software | From | Fixed in |
|---|---|---|
| openbsd / openssh | 4.3p2 | 4.3p2.x |