cve/2024/CVE-2024-37880.md

CVE-2024-37880

Description

The Kyber reference implementation before 9b8d306, when compiled by LLVM Clang through 18.x with some common optimization options, has a timing side channel that allows attackers to recover an ML-KEM 512 secret key in minutes. This occurs because poly_frommsg in poly.c does not prevent Clang from emitting a vulnerable secret-dependent branch.

POC

Reference

• https://github.com/antoonpurnal/clangover
• https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/

Github

• https://github.com/fkie-cad/nvd-json-data-feeds