Vulnerability Description
In Bouncy Castle for Java from 1.73 to before 1.78, three ML-KEM (CRYSTALS-Kyber) routines divided secret-derived polynomial coefficients by the modulus q: Poly.toMsg, which decodes the decrypted message, and the ciphertext compression routines Poly.compressPoly and PolyVec.compressPolyVec. An attacker able to measure the timing of a large number of decapsulations performed with the same long-term private key can recover that key. These are the KyberSlash1 (Poly.toMsg) and KyberSlash2 (ciphertext compression) divisions. Compression performed during encapsulation operates on values that become the public ciphertext and is not affected.
Related Weaknesses (CWE)
References
- https://github.com/bcgit/bc-java/commit/1590247178f2280defa36421475f015175dfbe9e
- https://github.com/bcgit/bc-java/commit/5adb2c5c5b462a332b01a012bea0784b40b904e5
- https://github.com/bcgit/bc-java/wiki/CVE-2024-14041
- https://kyberslash.cr.yp.to/
FAQ
What is CVE-2024-14041?
CVE-2024-14041 is a documented vulnerability. In Bouncy Castle for Java from 1.73 to before 1.78, three ML-KEM (CRYSTALS-Kyber) routines divided secret-derived polynomial coefficients by the modulus q: Poly.toMsg, which decodes the decrypted mess...
How severe is CVE-2024-14041?
CVSS scoring is not yet available for CVE-2024-14041. Check NVD for updates.
Is there a patch for CVE-2024-14041?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.