В начале июля вышел крутой writeup под заголовком "CVE-2021-22555: Turning \x00\x00 into 10000$" про уязвимость на heap в Linux Netfilter. Чем она примечательна: @k8s (in)security

k8s (in)security | United States America (US)

Create: 2021-07-28 Update: 2025-07-01 04:40:03

В начале июля вышел крутой writeup под заголовком "CVE-2021-22555: Turning \x00\x00 into 10000$" про уязвимость на heap в Linux Netfilter. Чем она примечательна:

1) Ей 15 лет - только представьте какое покрытие: с 2.6.19 до 5.15! Обновляйте Nodes ...
2) Позволяет обойти все современные security mitigations (SMAP/KASLR/SMEP) и выполнить произвольное выполнение кода в ядре.
3) Для демонстрации автор выбрал нарушение Kubernetes POD isolation на кластере kCTF (о нем я уже писал)

Для успешной эксплуатации уязвимости атакующему нужно CAP_NET_ADMIN capability внутри контейнера. Ну и, конечно, отсутствие AppArmor/SeLinux/seccomp профилей. Также атакующему на руку сыграет то, что вы не видите, то, что происходит внутри ваших Pod'ов - недостаток observability.

В заголовочную картинку я вынес payload, который непосредственно позволяет сделать container escape. Вот такой он маленький, простенький и при том универсальный.

Автор также выложил и PoC эксплоита - MUST HAVE для всех пентестеров ;)

k8s (in)security

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1.8K viewsD1g1, edited Jul 28, 2021 at 06:04

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В начале июля вышел крутой writeup под заголовком "CVE-2021-22555: Turning \x00\x00 into 10000$" про уязвимость на heap в Linux Netfilter. Чем она примечательна: