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CVE-2024-1544— ECDSA nonce bias caused by truncation

Quick assessment

Affected
wolfSSL wolfSSL
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.

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL 5.7.2 版本之前存在安全漏洞，该漏洞源于生成 ECDSA 时，使用的随机数不够随机。

CVSS 4.1 · Medium EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1524
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I. Basic Information for CVE-2024-1544

Vulnerability Information
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Vulnerability Title
ECDSA nonce bias caused by truncation
Source: CVE Program / CVE List V5
Vulnerability Description
Generating the ECDSA nonce k samples a random number r and then truncates this randomness with a modular reduction mod n where n is the order of the elliptic curve. Meaning k = r mod n. The division used during the reduction estimates a factor q_e by dividing the upper two digits (a digit having e.g. a size of 8 byte) of r by the upper digit of n and then decrements q_e in a loop until it has the correct size. Observing the number of times q_e is decremented through a control-flow revealing side-channel reveals a bias in the most significant bits of k. Depending on the curve this is either a negligible bias or a significant bias large enough to reconstruct k with lattice reduction methods. For SECP160R1, e.g., we find a bias of 15 bits.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL 5.7.2 版本之前存在安全漏洞，该漏洞源于生成 ECDSA 时，使用的随机数不够随机。
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
wolfSSL wolfSSL 0 ~ 5.6.4 -

II. Public POCs for CVE-2024-1544

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III. Intelligence Information for CVE-2024-1544

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Vendor Pages for CVE-2024-1544 (1)

Same Patch Batch · wolfSSL · 2024-08-27 · 3 CVEs total

CVE-2024-5991 Buffer overread in domain name matching
CVE-2024-5814 Unverifed Ciphersuite used on a client-side TLS1.3 Downgrade

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-203

V. Comments for CVE-2024-1544

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