03.13.06 Network Communications - Deny by Default - Allow by Exception
Deny network communications traffic by default and allow network communications traffic by exception.
3
artefacts
0
held by a system
1
at each review
hard
to go live
Policy repository / GRC workspace
where the evidence lives
teal = a system already holds it · olive = produced at each review
system holds itEvidence a system already holds
none for this control
periodic reviewEvidence produced at each review
- Rule review records · Document repository
governing documentDocuments that govern the control
- Firewall default-deny rule · Policy repository / GRC workspace
- Exception inventory · Policy repository / GRC workspace
First move
This control is evidenced by people and documents, not systems. Put the document under version control with an owner and review date, and log each review as a record with reviewer and date. Do not try to automate it.
Common gaps auditors find
- broad any-any rules persist
- no firewall rule review
Do this for your whole sheet
Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.
Build my evidence sheet03.13.04 Information in Shared System Resources · 03.13.08 Transmission Confidentiality and Integrity