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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2020-06-02T21:00:52

Updated: 2024-08-04T12:04:21.646Z

Reserved: 2020-05-01T00:00:00

Link: CVE-2020-12607

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-06-02T21:15:10.607

Modified: 2024-11-21T04:59:54.750

Link: CVE-2020-12607

cve-icon Redhat

No data.