Fallos del tipo CWE-126

527 resultados

Leitura excessiva de buffer na pilha

Ocorre quando o código lê mais dados de um buffer alocado na pilha do que o tamanho dele permite. O atacante consegue expor dados sensíveis que estão em posições de memória adjacentes (senhas, tokens, dados de outros processos) ou causar crash da aplicação.

Ejemplo

Uma função recebe uma string de 64 bytes na pilha, mas usa strcpy() ou memcpy() sem validar o tamanho real, lendo 128 bytes. Os 64 bytes extras vêm de outras variáveis locais ou frames de função anteriores, expondo informações confidenciais.

Cómo mitigar

Use funções seguras com limite explícito de bytes (strncpy, snprintf, memcpy com tamanho validado) ou linguagens com bounds-checking automático. Valide sempre o tamanho de entrada contra o buffer antes de ler, e use ferramentas estáticas (ASan, Clang Static Analyzer) durante desenvolvimento.

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