Which scenario or element would typically cause a CGI (Common Gateway Interface) security
issue?

A.
The external data provided by the user.

B.
The HTTP (Hypertext Transfer Protocol) protocol.

C.
The compiler or interpreter which runs the CGI script.

D.
The web browser.

Explanation:

Common Gateway Interface is an older form of scripting that was used extensively in early web
systems. CGI scripts could be used to capture data from a user using simple forms. The CGI script
ran on the web server, and it interacted with the client browser. CGI is frowned upon in new
applications because of its security issues, but it still widely used in older systems.
Although the answer is not given in the paragraph from the book, the answer would be D.
Reference:
Mike Pastore and Emmett Dulaney , Security+ Study Guide , 2nd Edition, Alameda , Sybex , 2004,
p 136