Firewalls fail quietly, one any/any at a time
A firewall policy is rarely broken on day one. It erodes — a temporary any/any rule that never gets removed, a vendor exception nobody documented, two rules that contradict so the looser one wins. After a few years of change requests, the ruleset no longer matches the security posture anyone believes is in place.
We read the policy the way an attacker probes it and the way an auditor questions it, then tell you which rules earn their place and which are quietly undermining your segmentation.
What we do
- Audit the ruleset. We review every rule for necessity, scope, and order, flagging anything overly permissive or unused.
- Find the dead weight. Redundant, shadowed, and expired rules are identified so the policy shrinks to what it actually needs.
- Test segmentation. We assess whether your zones genuinely contain lateral movement or just look like they do.
- Check the hygiene. Change-management and review practices are examined so the policy stays clean after we leave.
Built for compliance and containment
Reviews align to NIST SP 800-41 firewall guidance and PCI DSS segmentation requirements, supporting MAS TRM and PDPA obligations for Singapore and APAC clients.