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.
References
Link | Resource |
---|---|
https://github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458c | Issue Tracking Patch Third Party Advisory |
https://github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8de | Patch Third Party Advisory |
https://github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1 | Patch Third Party Advisory |
https://github.com/AntonKueltz/fastecdsa/issues/52 | Exploit Third Party Advisory |
History
No history.
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
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
Redhat Information
No data.
CWE