CVE-2020-12607 – fastecdsa

Package

Manager: pip
Name: fastecdsa
Vulnerable Version: >=0 <2.1.2

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00169 pctl0.38488

Details

Improper Verification of Cryptographic Signature in fastecdsa An issue was discovered in fastecdsa before 2.1.2. 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. This behavior is not solely a usability problem. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.

Metadata

Created: 2021-10-12T16:30:37Z
Modified: 2025-02-12T18:33:20Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/10/GHSA-56wv-2wr9-3h9r/GHSA-56wv-2wr9-3h9r.json
CWE IDs: ["CWE-347"]
Alternative ID: GHSA-56wv-2wr9-3h9r
Finding: F163
Auto approve: 1