A common development practice is to add "back door" code specifically designed for debugging or testing purposes that is not intended to be shipped or deployed with the application. When this sort of debug code is accidentally left in the application, the application is open to unintended modes of interaction. These back door entry points create security risks because they are not considered during design or testing and fall outside of the expected operating conditions of the application.
The most common example of forgotten debug code is a
main()method appearing in a web application. Although this is an acceptable practice during product development, classes that are part of a production J2EE application should not define a
Noncompliant Code Example
In this noncompliant code example, the
Stuff class has a
main() function that tests its methods. Although useful for debugging, if this function is left in production code (for a web application, for example), an attacker can invoke
Stuff.main() directly, gaining access to
Stuff's test methods.
A compliant solution simply removes the
main() method from the
Stuff class, depriving attackers of this entry point.
Leaving extra entry points into production code could allow an attacker to gain special access to the program.
This rule is not amenable to automated static analysis.