ghsa-wgq8-vr6r-mqxm
Vulnerability from github
Published
2025-09-03 21:29
Modified
2025-09-05 16:11
Severity ?
6.0 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Summary
frost-core: refresh shares with smaller min_signers will reduce security of group
Details

Impact

It was not clear that it is not possible to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module). Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold; however, this could cause a security loss to the participant's shares. We have not determined the exact security implications of doing so and judged simpler to just validate min_signers.

If for some reason you have done a refresh share procedure with a smaller min_signers we strongly recommend migrating to a new key.

Patches

Updating to 2.2.0 will ensure that the min_signers parameter will be validated. However it won't restore the security of groups refreshed with a smaller min_signers parameters.

Workarounds

You don't need to update if you don't use the refresh share functionality, or if you didn't try to change the min_signers parameter using the refresh share functionality.

References

Thank you BlockSec for reporting the finding

Show details on source website

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "frost-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-58359"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-325"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-09-03T21:29:18Z",
    "nvd_published_at": "2025-09-05T00:15:32Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nIt was not clear that it is not possible to change `min_signers` (i.e. the threshold) with the refresh share functionality (`frost_core::keys::refresh` module). Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold; however, this could cause a security loss to the participant\u0027s shares. We have not determined the exact security implications of doing so and judged simpler to just validate `min_signers`. \n\n If for some reason you have done a refresh share procedure with a smaller `min_signers` we strongly recommend migrating to a new key. \n\n### Patches\n\nUpdating to 2.2.0 will ensure that the `min_signers` parameter will be validated. However it won\u0027t restore the security of groups refreshed with a smaller `min_signers` parameters.\n\n### Workarounds\n\nYou don\u0027t need to update if you don\u0027t use the refresh share functionality, or if you didn\u0027t try to change the `min_signers` parameter using the refresh share functionality.\n\n### References\n\nThank you [BlockSec](https://blocksec.com/) for reporting the finding",
  "id": "GHSA-wgq8-vr6r-mqxm",
  "modified": "2025-09-05T16:11:20Z",
  "published": "2025-09-03T21:29:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58359"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ZcashFoundation/frost"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "frost-core: refresh shares with smaller min_signers will reduce security of group"
}


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