ghsa-56wv-2wr9-3h9r
Vulnerability from github
Published
2021-10-12 16:30
Modified
2025-02-12 18:33
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Summary
Improper Verification of Cryptographic Signature in fastecdsa
Details

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.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "fastecdsa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-12607"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-10-08T22:28:23Z",
    "nvd_published_at": "2020-06-02T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "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\u003csup\u003e-1\u003c/sup\u003e, 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.",
  "id": "GHSA-56wv-2wr9-3h9r",
  "modified": "2025-02-12T18:33:20Z",
  "published": "2021-10-12T16:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12607"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AntonKueltz/fastecdsa/issues/52"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8de"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/AntonKueltz/fastecdsa"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-56wv-2wr9-3h9r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/fastecdsa/PYSEC-2020-42.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Improper Verification of Cryptographic Signature in fastecdsa"
}


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