Insufficient Default OTP Shared Secret Length

{
  "id": "0cb31105788c977b3dfe5619c0bc3082d77742ed6b50349812fc1b9302b33e12",
  "url": "https://osv.dev/vulnerability/CVE-2024-8796",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Insufficient Default OTP Shared Secret Length",
    "summary": "Under the default configuration, Devise-Two-Factor versions >= 2.2.0 & < 6.0.0 generate TOTP shared secrets that are 120 bits instead of the 128-bit minimum defined by RFC 4226. Using a shared secret shorter than the minimum to generate a multi-factor authentication code could make it easier for an attacker to guess the shared secret and generate valid TOTP codes.",
    "evidence": "osv:CVE-2024-8796",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-8796",
      "aliases": [
        "CVE-2024-8796",
        "GHSA-qjxf-mc72-wjr2"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/devise-two-factor/devise-two-factor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "267c14d25b03c112f7f1853e4fa0732ed905314b"
                },
                {
                  "fixed": "cc6f34423d9c6af9f3e02be478c3c40dc7462e19"
                },
                {
                  "introduced": "5819f75b5a10d04c08cc6f4098263d5331aa1e76"
                },
                {
                  "last_affected": "5819f75b5a10d04c08cc6f4098263d5331aa1e76"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tinfoilsecurity:devise-two-factor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "6.0.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:tinfoilsecurity:devise-two-factor:1.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "last_affected": "1.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.0",
            "v5.1.0",
            "v4.0.2",
            "v5.0.0",
            "v4.0.1",
            "v4.0.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-8796.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.005890319Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/8xxx/CVE-2024-8796.json",
        "https://github.com/devise-two-factor/devise-two-factor/security/advisories/GHSA-qjxf-mc72-wjr2",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-8796"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-331"
        ],
        "cna_assigner": "SNPS",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/8xxx/CVE-2024-8796.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-8796",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510781,
  "published_at": "2024-09-17T17:12:13.468+00:00"
}