CVE Vulnerabilities

CVE-2020-12607

Improper Verification of Cryptographic Signature

Published: Jun 02, 2020 | Modified: Jun 03, 2020
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N
RedHat/V2
RedHat/V3
Ubuntu

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.

Weakness

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Affected Software

Name Vendor Start Version End Version
Fastecdsa Fastecdsa_project * 2.1.2 (excluding)

References