Six Weeks to PCI Assessment with Three Clusters
A payment processor must pass a PCI DSS assessment in six weeks. It runs three Kubernetes clusters: prod (120 nodes), staging (30), and dev (20). Evidence shows: critical patches average 45 days, but policy says 30; RBAC reviews happened 14 months ago; secrets are stored in Git and mounted as environment variables; audit logs retain 7 days; image signing is not used; CIS benchmark scans fail 38% of checks; and 12 critical vulnerabilities sit in internet-facing prod images. The auditor asks for control evidence across the clusters and wants a remediation plan. Engineering has five engineers and cannot freeze releases. The CISO wants to prioritize fixes that reduce audit risk and real risk, not just chase every CIS failure. Propose a six-week plan.
1. Prioritize the remediation work for the six-week PCI window. Justify what comes first and what can be handled with a documented compensating control.
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Weeks 1-2: rotate and remove secrets from Git, patch the 12 internet-facing critical vulnerabilities, and enable centralized audit logging with at least 12 months retention and 3 months readily available. These address direct compromise and the most likely audit findings.
Weeks 3-4: complete the RBAC review and least-privilege cleanup, turn on image signing in audit mode then enforce for prod, and document a 30-day critical patch SLA with exception handling.
Weeks 5-6: remediate high-risk CIS failures and prepare evidence packs. Use a documented compensating control for lower-risk CIS items, such as network segmentation and monitoring, rather than freezing releases.
The reasoning is that PCI risk is highest for exposed critical vulnerabilities and uncontrolled access, while the 38% CIS number includes many low-impact configuration drifts. Every exception needs an owner, a risk statement, and a review date.
2. Map the gaps to the relevant PCI DSS control areas and describe the evidence you would present for each.
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Secrets in Git map to PCI Requirement 3 (protect stored account data) and Requirement 8 (authentication); evidence: secret scan reports, rotation tickets, KMS configuration, and Git history cleanup. The RBAC review maps to Requirement 7 (least privilege); evidence: role-binding export, review sign-off, and can-i tests. Audit logs map to Requirement 10; evidence: central log pipeline, retention policy, alert rules, and a sample investigation.
Patching maps to Requirement 6; evidence: vulnerability scan, ticket timestamps, and exception approvals. CIS benchmark maps to Requirement 2 (secure configurations); evidence: scan results, risk-ranked exceptions, and remediation dates. Image signing supports Requirement 6 software integrity; evidence: admission policy and signature verification logs.
Do not present the CIS pass rate as the compliance objective. Map each gap to control intent so the auditor can see how the evidence demonstrates the requirement.
3. How would you handle the 38% CIS benchmark failure rate without freezing releases or chasing every finding?
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Treat CIS as a risk-ranked backlog, not a release gate. First separate findings that are exploitable in prod from hygiene and dev-only items; fix internet-facing and privilege-related failures immediately. Use admission in audit mode to measure impact, then enforce only the checks that prevent known attack paths, such as privileged containers, hostPath, and latest tags.
For the rest, create time-bound exceptions with compensating controls and an owner. Publish a weekly burn-down by risk, not raw percentage. The reasoning is that a 38% failure rate can hide a few critical items, and freezing releases would increase pressure to bypass controls.
The auditor wants evidence of a managed process, so show risk acceptance, exceptions, and continuous scanning. Also show that dev and staging findings are treated differently from prod, with a clear promotion gate.