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PART IV
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The Common Gateway Interface (CGI) was the original method for having a web server execute a program outside the web server process, yet on the same server The intent was to pass information via environment variables to an independent program, execute the program, and return the results to the web server for display Web servers are presentation and display engines, and they provide less than stellar results when used for other purposes For example, a web server instance can have numerous independent connections, and a program failure that results in a process bounce can affect multiple users if it is run within the web server process Separating any time-consuming and more risky programming cores, such as database lookups and manipulation, complex calculations, and other tasks, into separate processes was and still is a prudent idea CGI offers many advantages to web-based programs The programs can be written in a number of languages, although Perl is a favorite These scripted programs embrace the full functionality of a server, allowing access to databases, UNIX commands, other programs, and so on This provides a wide range of functionality to the web environment
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With this unrestrained capability, however, come security issues Poorly written scripts can cause unintended consequences at runtime The problem with poorly written scripts is that they are not always obvious Sometimes scripts appear to be fine, but unexpected user inputs can have unintended consequences The addition of extra elements on a command line, for example, can result in dramatically different outputs The use of the Perl backquote function, for example, allows a user to programmatically encode user input to a UNIX shell, and this works properly given proper user input, but if the user appends & /bin/ls -l to a proper input, this could generate a directory listing of the cgi-bin directory, which in turn gives away script names for future exploitation attempts Permitting users to execute other programs in such an uncontrolled fashion led many ISPs to prohibit the use of CGI scripts unless they were specifically approved by the ISP This led to considerable overhead and code checking to ensure clean code and validated user inputs A variety of books have been written on how to write secure code, and CGI has benefited Properly coded, CGI offers no more and no less risk than any other properly coded solution CGI s loss was that it was first and was abused first, and many developers learned by making mistakes early on CGI On UNIX systems, CGI offers the ultimate in programmable diversity and capability, and now that security standard practices have been learned and put to use, the system is experiencing new popularity
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CGI has been replaced in many web sites through newer server-side scripting technologies such as Java, Active Server Pages (ASP), ASPNet, and PHP All these technologies operate in much the same fashion as CGI: they allow programs to be run outside the web server and to return data to the web server to be served to end users via a web page Each of these newer technologies has advantages and disadvantages, but all of them have stronger security models than CGI With these security models comes reduced functionality and, as each is based on a different language, the learning curves are steeper Still, the need for adherence to programming fundamentals exists in these technologies code must be well designed and well written to avoid the same vulnerabilities that exist in all forms of code Buffer overflows are still an issue Changing languages or technologies does not eliminate the basic security problems associated with incorporating open-ended user input into code Understanding and qualifying user responses before blindly using them programmatically is essential to the security of a system
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