September 2024
Intermediate to advanced
444 pages
12h 30m
Spanish
Content preview from Seguridad de las Aplicaciones Web, 2ª Edición
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Capítulo 28. Defenderse de los ataques XSS
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En el Capítulo 10, analizamos en profundidad los ataques XSS de que se aprovechaban de la capacidad del navegador para ejecutar código JavaScript en los dispositivos de los usuarios. Las vulnerabilidades XSS están muy extendidas y son capaces de causar un daño importante, ya que las vulnerabilidades de ejecución de scripts tienen una gran amplitud de daños potenciales.
Afortunadamente, aunque el XSS aparece a menudo en la web, es bastante fácil de mitigar o prevenir por completo mediante buenas prácticas de codificación segura y técnicas de mitigación específicas para el XSS. Este capítulo trata sobre cómo proteger tu código de XSS.
Buenas prácticas de codificación Anti-XSS
Una regla importante de que puedes implementar en tu equipo de desarrollo para mitigar drásticamente las probabilidades de encontrarte con vulnerabilidades XSS es "no permitas que ningún dato suministrado por el usuario se pase al DOM -excepto como cadenas".
Esta regla no es aplicable a todas las aplicaciones, ya que muchas de ellas tienen funciones que incorporan la transferencia de datos del usuario al DOM. En este caso, podemos hacer esta regla más específica: "nunca permitas que se pasen al DOM datos no saneados proporcionados por el usuario".
Permitir que los datos proporcionados por el usuario rellenen el DOM debería ser una opción alternativa, ...
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