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Уязвимость grep до версии 2.11
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В утилите grep обнаружена опасная уязвимость, которая проявляется при обработке специально оформленного входного потока и может быть использована для инициирования отказа в обслуживании, а также, возможно, для выполнения произвольного кода.

Подвержены выпуски утилиты grep до версии 2.11. В выпуске 2.11, вышедшем в начале марта 2012 года, эта уязвимость была исправлена, однако не было сделано никаких специальных анонсов о том, что ошибка имеет отношение к проблемам с безопасностью.

Проблема связана с переполнением памяти при обработке длинных строк (на архитектуре x86_64 длина опасной строки составляет порядка 2 Гб). Ошибка была случайно обнаружена одним из пользователей Ubuntu, который пытался обрабатывать grep’ом вывод команды «ls -la» на своем хосте.

Простейший метод проверки наличия уязвимости (проблема присутствует, если после выполнения нижеприведённой команды выводится ошибка сегментирования):

$ perl -e ‘print «x»x(2**31)’ | grep x > /dev/null

Debian и Ubuntu на данный момент ещё не успели выпустить исправления. Однако, отдельные дистрибутивы, поставляющие свежие версии ПО, либо бэкпортирующие ключевые программы, не подвержены данной уязвимост.

Пока можете закрыть от своих пользователей, например так

 

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