Vulnerability Details CVE-2024-14041
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 27.2%
CVSS Severity
CVSS v3 Score 5.9
References
Products affected by CVE-2024-14041
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cpe:2.3:a:bouncycastle:bc-java:1.73
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cpe:2.3:a:bouncycastle:bc-java:1.74
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cpe:2.3:a:bouncycastle:bc-java:1.75
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cpe:2.3:a:bouncycastle:bc-java:1.76
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cpe:2.3:a:bouncycastle:bc-java:1.77