Palo Alto Firewall Security Assessment

A Palo Alto firewall security assessment should answer more than whether individual settings appear correct.

What security does this firewall actually provide?

Security assessment versus configuration review

A configuration review asks whether settings are configured correctly.

A security assessment goes further.

It examines the relationship between:

• policy
• effective access
• applications
• security profiles
• NAT
• management access
• decryption
• logging
• lifecycle
• organizational intent

A setting that looks unusual may be legitimate.

A setting that looks normal may contribute to a serious access path when combined with other configuration.

Security assessment versus penetration testing

A firewall audit is not a penetration test.

Penetration testing attempts to demonstrate exploitable weaknesses through controlled attack activity.

A firewall audit primarily examines the configuration, effective behaviour, evidence and intended security model.

The two activities can complement each other.

Security assessment versus compliance assessment

Compliance frameworks provide requirements against which findings can be mapped.

But compliance is not the same thing as security.

A firewall can satisfy a control while still allowing a path that the control does not address.

The recommended approach is:

Audit for risk first.

Map findings to frameworks second.

A structured assessment

A practical assessment follows the structure used throughout this book:

1. Scope and prepare.
2. Collect the configuration and evidence.
3. Inventory the rulebase.
4. Analyse effective access.
5. Review applications and services.
6. Review NAT.
7. Review management-plane security.
8. Review threat prevention.
9. Review decryption.
10. Review logging and monitoring.
11. Review HA and lifecycle.
12. Map findings to applicable frameworks.
13. Validate important findings.
14. Report the results.
15. Re-run the analysis after remediation.

Steps 3 and 4 are covered in depth inHow to Audit Palo Alto Security Policies andPalo Alto Effective Access Analysis. Use theaudit checklist to work through the full structure.

The report is part of the assessment

A technically accurate finding is only useful if the organization can act on it.

A good finding contains:

• unique ID
• clear title
• affected device/rule
• evidence
• risk explanation
• severity
• recommendation
• validation method

Recommendations should be specific, proportionate, verifiable and safe.

Avoid vague recommendations such as "harden the firewall" or "follow best practice."