Weaknesses of type CWE-129

324 results

Validação inadequada de índice de array

Ocorre quando o código não valida corretamente se um índice está dentro dos limites válidos do array antes de acessá-lo. Um atacante pode fornecer um índice fora dos limites (negativo ou maior que o tamanho), causando leitura ou escrita em endereços de memória inválidos, resultando em crash, vazamento de dados ou execução de código arbitrário.

Example

Uma API web recebe um parâmetro 'posição' do usuário e acessa um array sem verificar se a posição é válida. Um atacante envia posição=-1 ou posição=999999, lendo/alterando memória adjacente ao array, ou causando segmentation fault.

How to mitigate

Sempre validar que o índice é >= 0 e < tamanho do array antes de usar. Em linguagens de alto nível, preferir iteradores ou métodos nativos que validam automaticamente; em C/C++, usar bounds checking explícito ou bibliotecas como AddressSanitizer durante testes.

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