GHSA-92vm-mxjf-jqf3

Improper Verification of Cryptographic Signature in starkbank-ecdsa

Source: GitHub Advisory Database (reviewed) Critical CVE-2021-43572

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	starkbank-ecdsa	< 2.0.1	2.0.1

Details

As written in the advisory (Markdown source, shown as plain text).

The `verify` function in the Stark Bank Python ECDSA library (starkbank-ecdsa) 2.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2021-43572 advisory
https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f web
https://github.com/pypa/advisory-database/tree/main/vulns/starkbank-ecdsa/PYSEC-2021-426.yaml web
https://github.com/starkbank/ecdsa-python package
https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 web
https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries web