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Критические уязвимости в Memcached
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i

Компания Cisco сообщила о выявлении в системе кэширования данных в оперативной памяти memcached серии критических уязвимостей, позволяющих выполнить код в системе с правами процесса memcached через передачу специально оформленных команд. Проблемы устранены во вчерашнем выпуске Memcached 1.4.33.

  • CVE-2016-8705 — серия целочисленных переполнений в функции process_bin_update, отвечающей за обработку команд Set (0x01), Add (0x02), Replace (0x03) , SetQ (0x11), AddQ (0x12) и ReplaceQ (0x13). Эксплуатация уязвимости может привести к переполнению кучи и выполнению кода атакующего;
  • CVE-2016-8704 — целочисленное переполнение в функции process_bin_append_prepend, отвечающей за обработку команд Append (0x0e), Prepend (0x0f), AppendQ (0x19) и PrependQ (0x1a). Эксплуатация уязвимости может привести к переполнению кучи и выполнению кода атакующего;
  • CVE-2016-8706 — целочисленное переполнение в функции process_bin_sasl_auth, используемой для обработки команд SASL-аутенитификации, которое может привести к переполнению кучи и выполнению кода атакующего.

Администраторам рекомендуется убедиться, что доступ к сетевому порту Memcached открыт только для внутренних служб, а процесс memcached запускается от непривилегированного отдельного пользователя. Уязвимости проявляются только при использовании бинарного протокола, поэтому в качестве обходного метода защиты достаточно ограничить передачу команд только в режиме ASCII (запуск с опцией «-B ascii»). Обновления пакетов для дистрибутивов пока не выпущены (Debian, FreeBSD, Fedora, Ubuntu, CentOS, SUSE,openSUSE, RHEL). Для всех уязвимостей доступны рабочие прототипы эксплоитов.

 

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