CVE-2021-43569 — CRITICAL (9.8)

Vulnerability Description

The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Starkbank	Ecdsa-Dotnet	1.3.2

Related Weaknesses (CWE)

CWE-347

References

https://github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2Third Party Advisory
https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-ExploitThird Party Advisory
https://github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2Third Party Advisory
https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-ExploitThird Party Advisory

FAQ

What is CVE-2021-43569?

CVE-2021-43569 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

How severe is CVE-2021-43569?

CVE-2021-43569 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-43569?

Check the references section above for vendor advisories and patch information. Affected products include: Starkbank Ecdsa-Dotnet.