GHSA-J7C9-79X7-8HPR

Vulnerability from github – Published: 2025-12-03 16:27 – Updated: 2025-12-04 16:22
VLAI?
Summary
step-ca Has Improper Authorization Check for SSH Certificate Revocation
Details

Summary

A security fix is now available for Step CA that resolves a vulnerability affecting deployments configured with the SSHPOP provisioner. All operators running these provisioners should upgrade to the latest release (v0.29.0) immediately.

The issue was discovered and responsibly disclosed by a research team during a security review. There is no evidence of active exploitation.

To limit exploitation risk during a coordinated disclosure window, we are withholding detailed technical information for now. A full write-up will be published in several weeks.

Embargo List

If your organization runs Step CA in production and would like advance, embargoed notification of future security updates, visit https://u.step.sm/disclosure to request inclusion on our embargo list.

Acknowledgements

This issue was identified and reported by Gabriel Departout and Andy Russon, from AMOSSYS. This audit was sponsored by ANSSI (French Cybersecurity Agency) based on their Open-Source security audit program.

Stay safe, and thank you for helping us keep the ecosystem secure.

Severity ?
5.0 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.28.4"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/smallstep/certificates"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.29.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66406"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-03T16:27:59Z",
    "nvd_published_at": "2025-12-03T20:16:26Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nA security fix is now available for Step CA that resolves a vulnerability affecting deployments configured with the SSHPOP provisioner.\nAll operators running these provisioners should upgrade to the latest release (`v0.29.0`) immediately.\n\nThe issue was discovered and responsibly disclosed by a research team during a security review. There is no evidence of active exploitation.\n\nTo limit exploitation risk during a coordinated disclosure window, we are withholding detailed technical information for now. A full write-up will be published in several weeks.\n\n---\n\n## Embargo List\n\nIf your organization runs Step CA in production and would like advance, embargoed notification of future security updates, visit https://u.step.sm/disclosure to request inclusion on our embargo list.\n\n---\n\n## Acknowledgements\n\nThis issue was identified and reported by Gabriel Departout and Andy Russon, from [AMOSSYS](http://amossys.fr/). This audit was sponsored by [ANSSI](https://cyber.gouv.fr/) (French Cybersecurity Agency) based on [their Open-Source security audit program](https://cyber.gouv.fr/open-source-lanssi#:~:text=Financement%20d%27%C3%A9valuations%20de%20s%C3%A9curit%C3%A9%20de%20logiciels%20libres).\n\n---\n\nStay safe, and thank you for helping us keep the ecosystem secure.",
  "id": "GHSA-j7c9-79x7-8hpr",
  "modified": "2025-12-04T16:22:30Z",
  "published": "2025-12-03T16:27:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/smallstep/certificates/security/advisories/GHSA-j7c9-79x7-8hpr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66406"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/smallstep/certificates"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "step-ca Has Improper Authorization Check for SSH Certificate Revocation"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.