An attacker can send the web server an overly long HTTP GET request, overflowing a buffer in the Netscape httpd service and overwriting the process's stack. This allows a sophisticated attacker to force the machine to execute arbitrary program code. The ISS X-Force has demonstrated the possibility of using this vulnerability to execute code as SYSTEM on the server, giving an attacker full control of the machine.
Vulnerable systems:
Netscape Enterprise 3.6sp2
Netscape FastTrack 3.0.1 on NT
Admin Server 3.5 on NT
Immune systems:
Netscape FastTrack 3.0.2 on Irix 6.x
Admin Sever 3.5 on Irix 6.x
Netscape Enterprise 3.6sp2 on Irix 6.x