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CVE-2021-41773: Apache 2.4.49 Path Traversal

Уязвимость позволяет выйти за пределы директории вебсайта и без проблем считать, ну например, /etc/passwd

К уязвимости привел обычный рефакторинг - разработчики в версии 2.4.49 решили унифицировать простыню с нормализацией пути, и вынесли обработку в отдельную функцию ap_normalize_path.

В реализации с проверкой обработки символа '.' в пути и закрался баг в 571 строке - программист не учел, что в контексте еще не произошел url decode.

В итоге возникла ситуация, когда все проверки на обход каталога через %2e%2e попали в условие, которое не обрабатывалось, и доверенная функция по нормализации пути ap_normalize_path, которая и должна срезать ситуации вроде ../, стала возвращать ненормализованный путь.

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Forwarded from Anton Kirsanov
CVE-2021-41773: Apache 2.4.49 Path Traversal

Уязвимость позволяет выйти за пределы директории вебсайта и без проблем считать, ну например, /etc/passwd

К уязвимости привел обычный рефакторинг - разработчики в версии 2.4.49 решили унифицировать простыню с нормализацией пути, и вынесли обработку в отдельную функцию ap_normalize_path.

В реализации с проверкой обработки символа '.' в пути и закрался баг в 571 строке - программист не учел, что в контексте еще не произошел url decode.

В итоге возникла ситуация, когда все проверки на обход каталога через %2e%2e попали в условие, которое не обрабатывалось, и доверенная функция по нормализации пути ap_normalize_path, которая и должна срезать ситуации вроде ../, стала возвращать ненормализованный путь.
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CVE-2021-41773: Apache 2.4.49 Path Traversal

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