GitHub Advisoryadvisory · PyPI
GHSA-56wv-2wr9-3h9r Improper Verification of Cryptographic Signature in fastecdsa
HIGH
Official page ↗
- Aliases
- CVE-2020-12607
- Ecosystem
- PyPI
- Packages
- fastecdsa
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-347
- Reviewed
- 2021-10-08
Affected packages
• PyPI fastecdsa: < 2.1.2 → fixed in 2.1.2
Description
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.
Related
Alias · CVE (1)
- CVE-2020-12607 An issue was discovered in fastecdsa before 2.1.2. vulnerability
Weakness · CWE (1)
- CWE-347 Improper Verification of Cryptographic Signature weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-12607 advisory
- https://github.com/AntonKueltz/fastecdsa/issues/52 web
- https://github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458c web
- https://github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8de web
- https://github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1 web
- https://github.com/AntonKueltz/fastecdsa package
- https://github.com/advisories/GHSA-56wv-2wr9-3h9r advisory
- https://github.com/pypa/advisory-database/tree/main/vulns/fastecdsa/PYSEC-2020-42.yaml web