Improper Validation of Consistency within Input

What is CWE-1288?

Trajeto do atacante passo a passo

1. 1

   Identificar um caminho de código que trata input não confiável sem validação.

2. 2

   Criar um payload que explora o comportamento inseguro — injeção, traversal, overflow ou abuso de lógica.

3. 3

   Entregar o payload através de um pedido normal e observar a reação da aplicação.

4. 4

   Iterar até que a resposta exponha dados, execute código do atacante ou escale privilégios.

How to prevent CWE-1288

• Implementation Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.

Frequently asked questions

Further reading

• MITRE — CWE-1288 oficial https://cwe.mitre.org/data/definitions/1288.html