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17-Nov-2019 03:08

All interesting software packages rely upon external input.Although information typed at a computer might be the most familiar, networks and external devices can also send data to a program.In some cases its usage can obscure the real underlying weakness or otherwise hide chaining and composite relationships.Some people use "input validation" as a general term that covers many different neutralization techniques for ensuring that input is appropriate, such as filtering, canonicalization, and escaping.In computer science, data validation is the process of ensuring that a program operates on clean, correct and useful data.It uses routines, often called "validation rules" "validation constraints" or "check routines", that check for correctness, meaningfulness, and security of data that are input to the system.

Therefore, data validation should start with business process definition and set of business rules within this process.

A static analysis tool might allow the user to specify which application-specific methods or functions perform input validation; the tool might also have built-in knowledge of validation frameworks such as Struts.

The tool may then suppress or de-prioritize any associated warnings.

In a client-server architecture, the programmer might assume that client-side security checks cannot be bypassed, even when a custom client could be written that skips those checks (CWE-602).

Automated Static Analysis Some instances of improper input validation can be detected using automated static analysis.

Therefore, data validation should start with business process definition and set of business rules within this process.A static analysis tool might allow the user to specify which application-specific methods or functions perform input validation; the tool might also have built-in knowledge of validation frameworks such as Struts.The tool may then suppress or de-prioritize any associated warnings.In a client-server architecture, the programmer might assume that client-side security checks cannot be bypassed, even when a custom client could be written that skips those checks (CWE-602).Automated Static Analysis Some instances of improper input validation can be detected using automated static analysis.For example, try the following program: Test it with 123, then with 123abc.