If exceptions or interpreter-generated error messages occur, this indicates that the input was not detected and handled within the application logic itself.The user has no control over the price variable, however the code does not prevent a negative value from being specified for quantity.Depending on the context of the code, CRLF Injection (CWE-93), Argument Injection (CWE-88), or Command Injection (CWE-77) may also be possible.Example 4This function attempts to extract a pair of numbers from a user-supplied only the m variable will be initialized.Phase: Architecture and Design Strategies: Input Validation; Libraries or Frameworks Use an input validation framework such as Struts or the OWASP ESAPI Validation API.If you use Struts, be mindful of weaknesses covered by the CWE-101 category.
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.
is able to craft the input in a form that is not expected by the rest of the application.
This will lead to parts of the system receiving unintended input, which may result in altered control flow, arbitrary control of a The "input validation" term is extremely common, but it is used in many different ways.
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.