C Version with x86+ARM shellcode

[huberteff]

Here is an exploit written in C for the the copy.fail (https://copy.fail/, CVE-2026-31431) vulnerability. The embedded shellcode works on other CPUs than X86, with ARM as a primary target.

Code: https://github.com/huberteff/copy-fail-CVE-2026-31431/
Technical writeup: https://www.feyrer.de/redir/copy.fail-C-version-Writeup.html

[fanoush]

it probably needs pip install pwntools first or it fails and even then it does not seem to work for me on aarch64 ubuntu. Or is this expected?

 ./cfcARM 
Starting XFRM IPSec tunnel simulation...
Decompressed size: 188 bytes
First few bytes: 7f 45 4c 46...
Processed 0/188 bytes
Done processing 188 bytes
Executing su...
Password: 
su: Authentication failure

python version from #42 works fine