{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "mdanter/ecc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-203",
      "CWE-354"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-04-25T18:31:58Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### ECDSA Canonicalization\n\nPHPECC is vulnerable to malleable ECDSA signature attacks. \n\n### Constant-Time Signer\n\nWhen generating a new ECDSA signature, the GMPMath adapter was used. This class wraps the GNU Multiple Precision arithmetic library (GMP), which does not aim to provide constant-time implementations of algorithms.\n\nAn attacker capable of triggering many signatures and studying the time it takes to perform each operation would be able to leak the secret number, `k`, and thereby learn the private key.\n\n### EcDH Timing Leaks\n\nWhen calculating a shared secret using the `EcDH` class, the scalar-point multiplication is based on the arithmetic defined by the `Point` class.\n\nEven though the library implements a Montgomery ladder, the `add()`, `mul()`, and `getDouble()` methods on the `Point` class are not constant-time. This means that your ECDH private keys are leaking information about each bit of your private key through a timing side-channel.",
  "id": "GHSA-346h-749j-r28w",
  "modified": "2024-04-25T18:31:58Z",
  "published": "2024-04-25T18:31:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/mdanter/ecc/2024-04-24.yaml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/paragonie/phpecc/releases/tag/v2.0.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/phpecc/phpecc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PHPECC vulnerable to multiple cryptographic side-channel attacks"
}