Step CA Has Authorization Bypass in ACME and SCEP Provisioners

Summary

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

The issue was discovered and 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.

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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.

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Acknowledgements

This issue was identified and reported by Stephen Kubik of the Cisco Advanced Security Initiatives Group (ASIG)

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