CVE-2021-43569: Improper Verification of Cryptographic Signature

November 9, 2021 (updated November 12, 2021)

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

References

github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2
nvd.nist.gov/vuln/detail/CVE-2021-43569
research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/

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