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CVE-2020-36843

Quick assessment

Affected
str4d ed25519-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.

EdDSA-Java是Jack Grigg个人开发者的一个 EdDSA 的纯 Java 实现。 EdDSA-Java 0.3.0及之前版本存在安全漏洞，该漏洞源于签名可塑性，不满足SUF-CMA属性，可能导致攻击者创建新的有效签名。

CVSS 4.3 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-36843

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
The implementation of EdDSA in EdDSA-Java (aka ed25519-java) through 0.3.0 exhibits signature malleability and does not satisfy the SUF-CMA (Strong Existential Unforgeability under Chosen Message Attacks) property. This allows attackers to create new valid signatures different from previous signatures for a known message.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
EdDSA-Java 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EdDSA-Java是Jack Grigg个人开发者的一个 EdDSA 的纯 Java 实现。 EdDSA-Java 0.3.0及之前版本存在安全漏洞，该漏洞源于签名可塑性，不满足SUF-CMA属性，可能导致攻击者创建新的有效签名。
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
str4d ed25519-java 0 ~ 0.3.0 -

II. Public POCs for CVE-2020-36843

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III. Intelligence Information for CVE-2020-36843

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Proof of Concept for CVE-2020-36843 (1)

Other References for CVE-2020-36843 (1)

IV. Related Vulnerabilities

Same weakness: CWE-347

V. Comments for CVE-2020-36843

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