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Common Gateway Interface - CGI

CGI vulnerabilities can be found on many Web servers. CGI programs make Web pages interactive by enabling them to collect information, run programs, or access files. Vulnerable CGI programs normally run with the same privileges as the Web server software. Therefore, a hacker who can exploit CGI programs can deface Web pages, attempt to steal information, or compromise the system.
Developers need to think about the security implications of the CGI programs they develop and incorporate security into them. CGI programs should run with the minimum privileges needed to complete the operations they were designed to accomplish. Also, Web servers should not run as the system's root or administrator. Interpreters used with CGI script, such as “perl” and “sh,” should be removed from CGI program directories. Leaving these interpreters in CGI program directories allows attackers to execute malicious CGI scripts. Using scanning software such as vulnerability scanners or CGI scanners can also help find and provide information to correct CGI vulnerabilities.
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