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CVE-2024-37880

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Date: June 9, 2024

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.

Language: C

Severity Score

Related Resources (7)

https://nvd.nist.gov/vuln/detail/CVE-2024-37880
https://github.com/antoonpurnal/clangover
https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/
https://twitter.com/purnaltoon/status/1797644696568959476
https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c
https://news.ycombinator.com/item?id=40577486
https://www.mend.io/vulnerability-database/CVE-2024-37880

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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