#VU105889 Improper Verification of Cryptographic Signature in EDDSA API - CVE-2020-36843

Vulnerability identifier: #VU105889

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-36843

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
EDDSA API
Web applications / Modules and components for CMS

Vendor: Jenkins

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the EdDSA implementation in affected plugin exhibits signature malleability. A remote user can create new valid signatures different from previous signatures for a known message.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

EDDSA API: 0.3.0-13.v7cb_69ed68f00

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External links
https://eprint.iacr.org/2020/1244
https://github.com/str4d/ed25519-java/issues/82#issue-727629226
https://www.jenkins.io/security/advisory/2025-03-19/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.