Create: 2020-07-29 Update: 2025-04-08 22:00:37

⭕️ CVE-2020-10713 GRUB2 - BootHole

В GNU GRUB2 обнаружили эпичную уязвимость.

Затрагивает системы с Secure Boot и стандартным CA UEFI CA, все подписанные версии GRUB2.

Уязвимы почти все дистры Linux, куча других embedded операционок и решений вроде Xen, большинство современных операционных систем, сервера и рабочие станции, немало IoT`ов.

Уязвимость как из учебника, переполнение кучи при чтении слишком длинного параметра из grub.cfg.

Проверку на длину конечно же добавили, и на такой случай вызвали макрос fatal_error, и как оказалось fatal_error громко ругается, но не останавливает исполнение кода (а все надеялись), отсюда контроль над памятью.

И это всё за пределами контекста операционной системы, никаких ASLR, DEP и nx mitigation нет, зато есть полный контроль над загрузкой оси. Идеально для буткитов.

Репорт подтолкнул поаудитить код GRUB, и оказалось, что там еще ряд неприятных багов.

👉 https://eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/

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⭕️ CVE-2020-10713 GRUB2 - BootHole

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