Falhas do tipo CWE-822

248 resultados

Desreferência de ponteiro não confiável

Ocorre quando o código desreferencia um ponteiro cujo valor veio de uma fonte externa (entrada do usuário, rede, arquivo) sem validação prévia. Um atacante pode fornecer um endereço de memória inválido ou malicioso, causando crash, leitura de dados sensíveis ou execução de código arbitrário.

Exemplo

Um aplicativo recebe um offset de memória via requisição HTTP, converte para ponteiro e acessa dados sem verificar se o endereço é válido: int *ptr = (int *)user_input; int valor = *ptr;. O atacante fornece um endereço inválido ou que aponta para região protegida.

Como mitigar

Nunca confie em ponteiros ou endereços vindos de entrada externa. Se necessário, use estruturas de dados gerenciadas (arrays, listas), validação rigorosa de limites, ou isolamento via sandboxing. Em linguagens modernas (C++, Rust), prefira smart pointers e verificações em tempo de compilação.

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