Timing Attack Affecting fastecdsa package, versions [,2.1.2)
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Test your applications- Snyk ID SNYK-PYTHON-FASTECDSA-570964
- published 3 Jun 2020
- disclosed 3 Jun 2020
- credit Unknown
Introduced: 3 Jun 2020
CVE-2020-12607 Open this link in a new tabHow to fix?
Upgrade fastecdsa to version 2.1.2 or higher.
Overview
fastecdsa is a python package for doing fast elliptic curve cryptography, specifically digital signatures.
Affected versions of this package are vulnerable to Timing Attack. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.