Fallos del tipo CWE-788

147 resultados

Acesso de memória além do limite do buffer

A aplicação tenta acessar dados em um endereço de memória que está fora dos limites de um buffer alocado. Isso ocorre quando o código não valida corretamente o tamanho ou índice antes de ler/escrever, permitindo leitura de dados sensíveis ou corrupção de memória adjacente.

Ejemplo

Um servidor processa um pacote de rede e copia dados para um array de 256 bytes sem verificar o tamanho real do pacote. Se o pacote tiver 500 bytes, a cópia escreve 244 bytes além do buffer, sobrescrevendo variáveis locais ou dados de controle da pilha.

Cómo mitigar

Sempre validar e limitar o tamanho de leitura/escrita aos limites conhecidos do buffer antes de acessá-lo. Use funções seguras (como `strncpy` em C, ou linguagens com gerenciamento automático de memória), ou implemente verificações explícitas de limites e índices.

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