Improper Verification of Cryptographic Signature in starkbank-ecdsa

KRITISCH 9.8CVE-2021-43572 · GHSA-92vm-mxjf-jqf3 · PYSEC-2021-426 · Published 09/11/2021 · updated 17/06/2026

Kurz gesagt

CVE-2021-43572 ist eine Schwachstelle (KRITISCH (CVSS 9.8)) in starkbank-ecdsa, ecdsa-python (starkbank).
Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 1.2%, höher als bei 69.5% aller Schwachstellen.
Abhilfe: auf 2.0.1 oder neuer aktualisieren.

Package	Affected versions	Patched versions
starkbank-ecdsa PyPI	`< 2.0.1`	`2.0.1`
ecdsa-python starkbank	`< 2.0.1`	`2.0.1`

Description

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.

NVD description

The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

References

nvd.nist.gov/vuln/detail/CVE-2021-43572 · ADVISORY
starkbank/ecdsa-python commit d136170 · WEB
pypa/advisory-database · WEB
starkbank/ecdsa-python · PACKAGE
starkbank/ecdsa-python release v2.0.1 · WEB
research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries · WEB
research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries · Exploit
GitHub Advisory GHSA-92vm-mxjf-jqf3 · ADVISORY

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