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CVE-2024-14041— ML-KEM (Kyber) decapsulation leaks private key information through non-constant-time division in message decoding and ciphertext compression (KyberSlash)

Quick assessment

Affected
Legion of the Bouncy Castle Inc. BC-JAVA
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bouncy Castle Bouncy Castle for Java是Bouncy Castle组织的一个加密库。 Bouncy Castle for Java 1.73版本至1.78之前版本存在侧信道信息泄露漏洞，该漏洞源于ML-KEM例程中Poly.toMsg、Poly.compressPoly和PolyVec.compressPolyVec函数除以模数q产生时序差异，攻击者可通过测量大量解密操作的时序恢复私钥。

CVSS 8.2 · High EPSS 0.34% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
Legion of the Bouncy Castle Inc. BC-JAVA 1.73< 1.78 affected
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I. Basic Information for CVE-2024-14041

Vulnerability Information
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Vulnerability Title
ML-KEM (Kyber) decapsulation leaks private key information through non-constant-time division in message decoding and ciphertext compression (KyberSlash)
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Bouncy Castle for Java 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bouncy Castle Bouncy Castle for Java是Bouncy Castle组织的一个加密库。 Bouncy Castle for Java 1.73版本至1.78之前版本存在侧信道信息泄露漏洞，该漏洞源于ML-KEM例程中Poly.toMsg、Poly.compressPoly和PolyVec.compressPolyVec函数除以模数q产生时序差异，攻击者可通过测量大量解密操作的时序恢复私钥。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Legion of the Bouncy Castle Inc. BC-JAVA 1.73 ~ 1.78 -

II. Public POCs for CVE-2024-14041

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III. Intelligence Information for CVE-2024-14041

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Patches & Fixes for CVE-2024-14041 (2)

Vendor Advisories for CVE-2024-14041 (1)

Other References for CVE-2024-14041 (1)

IV. Related Vulnerabilities

Same product: BC-JAVA
Same vendor: Legion of the Bouncy Castle Inc.
Same weakness: CWE-208

V. Comments for CVE-2024-14041

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