Bug 2351813 (CVE-2020-36843)

Summary: CVE-2020-36843 d25519-java: Signature Malleability in EdDSA-Java Leading to SUF-CMA Violation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in EdDSA-Java (ed25519-java). This vulnerability allows attackers to create new valid signatures different from previous signatures for a known message via signature malleability, violating the Strong Existential Unforgeability under Chosen Message Attacks (SUF-CMA) property.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2352361, 2352360    
Bug Blocks:    

Description OSIDB Bzimport 2025-03-13 08:03:26 UTC
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.