This is a PoC for CVE-2023-4911 ("Looney Tunables") that exploits a bug in the glibc dynamic loader's GLIBC_TUNABLES environment variable parsing function parse_tunables().
This is a rewrite of the C PoC's into a pure python approach. I did this to make it easier to customize the exploit for other platforms. The only requirement is pwntools, which can be installed as follows:
python3 -m pip install --upgrade pwntools
I got the original C PoC from: https://github.com/leesh3288/CVE-2023-4911
This code was tested on Ubuntu 22.04.3 with glibc version 2.35-0ubuntu3.1
This image shows the Ubuntu su executable. This is why " is chosen as the directory symbol, and the offset of -20 bytes points to that symbol:
You should check the su binary on the machine you are targeting to make sure the offset and symbol are correct.