Vulnerability in Antonkueltz Fastecdsa
CVE-2020-12607
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.013 (68.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458c (Patch, Third Party Advisory, Issue Tracking)
- github.com/AntonKueltz/fastecdsa/issues/52 (Exploit, Third Party Advisory)
- github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1 (Patch, Third Party Advisory)
- github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8de (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-12607?
- CVE-2020-12607 is a high-severity vulnerability in Antonkueltz Fastecdsa, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2020-06-02.
- How severe is CVE-2020-12607?
- High severity. CVSS v3 base score is 7.5 out of 10.