Vulnerability · Published Nov 9, 2021 · Assigned by mitre
CVE-2021-43572
Critical 9.8
In plain English
A critical-severity security flaw in the starkbank-ecdsa package (PyPI). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.2%top 30.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | starkbank-ecdsa | 2.0.1 | GHSA-92vm-mxjf-jqf3 |
| PyPI | starkbank-ecdsa | 2.0.1 | PYSEC-2021-426 |
Affected products (as reported)
References
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/ x_refsource_MISC
- https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 x_refsource_MISC
- https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f x_refsource_MISC