PCI DSS 1.2.8: Securing NSC Configuration Files
Network Security Component (NSC) configuration files are prime targets for attackers seeking to bypass security controls. PCI DSS 1.2.8 requires you to protect these files from unauthorized access and maintain consistency between configurations and active network deployments. Misconfigured or tampered NSCs create dangerous blind spots in your security posture.
What this means
This control mandates that all configuration files for network security components—such as firewalls, intrusion detection systems, and routers—are protected against unauthorized viewing, modification, or deletion. Additionally, your active network configurations must align with documented configuration files to prevent drift that could hide vulnerabilities or create exploitable gaps. This includes both access controls to the configuration files themselves and processes to keep them synchronized with running systems.
How to comply
- 1.Identify all NSCs in your network and catalog their configuration files
- 2.Restrict access to NSC configuration files using role-based access controls (RBAC)
- 3.Encrypt configuration files at rest and in transit
- 4.Implement change management processes for all NSC configuration updates
- 5.Conduct regular configuration audits to detect and correct drift between files and active systems
- 6.Log and monitor all access and modifications to NSC configuration files
- 7.Maintain secure backups of configuration files with restricted access
- 8.Document the baseline configuration for each NSC and establish version control
Evidence auditors look for
- Access control lists (ACLs) limiting NSC configuration file permissions to authorized personnel
- Configuration management system logs showing who accessed or modified files and when
- Automated configuration compliance reports comparing active settings to approved baselines
- Encrypted configuration file backups stored in secure locations
- Change tickets documenting all NSC configuration modifications
- File integrity monitoring alerts for unauthorized configuration changes
- Role-based user accounts with principle of least privilege for NSC management
- Network diagrams and configuration inventories kept current with active deployments
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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