HP Security Bulletin – A potential security vulnerability has been identified with HP Tru64 UNIX running Secure Shell (SSH). The vulnerability could be exploited remotely by an unauthorized user to identify valid users.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/56825/SSRT071323.txt
Source: https://packetstormsecurity.com/files/56825/HP-Security-Bulletin-2007-13.23.html