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VID 21048
Severity 40
Port 80, ...
Protocol TCP
Class CGI
Detailed Description The 'guestbook.cgi' CGI is installed.
The guestbook CGI program contains a vulnerability that allows a remote attacker to execute arbitrary commands on a web server. This is present in Selena Sol's guestbook on servers with Server Side Includes enabled.

* References:
http://www.iss.net/security_center/static/321.php
http://www.extropia.com/scripts/guestbook_security.html
Recommendation If it's not needed, remove the file from the CGI directory, or fix as the following:

Solution A. Modify the guestbook.setup file, adding the word exec to the comma delimited @bad_words variable.

Solution B. Modify the guestbook.setup file so that the @allow_html variable is set to no.
Related URL CVE-1999-0237 (CVE)
Related URL (SecurityFocus)
Related URL (ISS)