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

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cve-icon MITRE Information

Status: PUBLISHED

Assigner: mitre

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

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

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


Link: CVE-2020-12607

JSON object: View

cve-icon NVD Information

Status : Analyzed

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

Modified: 2020-06-03T13:47:42.407


Link: CVE-2020-12607

JSON object: View

cve-icon Redhat Information

No data.

CWE