Falhas do tipo CWE-36

144 resultados

Traversal de Diretório via Caminho Absoluto

A aplicação usa entrada do usuário para construir caminhos de arquivo, mas não valida se o resultado aponta para fora do diretório permitido. Um atacante injeta caminhos absolutos (como /etc/passwd) que ignoram as restrições de diretório, acessando arquivos sensíveis do sistema.

Exemplo

Um servidor web recebe ?file=../../../etc/passwd ou file=/etc/passwd e o código concatena direto em open('/uploads/' + file) sem verificar se o caminho resultante está realmente dentro de /uploads/, expondo dados confidenciais.

Como mitigar

Valide e normalize o caminho com funções seguras (realpath, Path.resolve), rejeite caminhos absolutos e sequências de traversal (..), e use listas brancas de arquivos permitidos. Garanta que o caminho final está dentro do diretório esperado antes de abrir o arquivo.

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