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CVE-2023-4911 - Looney Tunables

This is a (atm very rough) proof of concept for CVE-2023-4911. So far I've only verified it works on Ubuntu 22.10 kinetic. Current version of the exploit contains a fair amount of "magic" offsets. If you have suggestions on how to improve the heap shaping, feel free to send a PR my way :).

This exploit is basically an implementation of Qualys' excellent write up. It deviates in some places. That's not necessarily because I think I know better, this is just what worked on my VM. There is probably room for improvement.

Usage

  1. Compile the exploit and suid library using make.
  2. Run ./exploit from a writable directory, containing both suid_lib.so and exploit. It'll create a folder called U in the current directory and populate it with the necessary libraries.

In my limited testing, the exploit needs somewhere between 4000-8000 attempts. The stack spray is not quite as good as Qualys' implementation, so it takes a bit longer.

Here's an example of the exploit in action (sped up): https://youtu.be/uw0EJ5zGEKE

Improvement ideas

If you feel like hacking on this, here are some ideas to get you started:

  • Make it self-contained. See https://github.com/ly4k/PwnKit for inspiration.
  • Make the heap shaping more robust. Right now it's very fragile and depends on a lot of magic offsets.
  • Make it work on more distros.