ISO 27001 Control 8.18: Restricting Privileged Utility Programs
Privileged utility programs pose a critical security risk—they can bypass your system and application controls entirely. Control 8.18 requires you to restrict, control, and monitor access to these powerful tools. This guide shows SMBs how to implement this control efficiently without building complex infrastructure.
What this means
Control 8.18 mandates that your organization must limit who can access and use privileged utility programs—tools like system administrators' utilities, debugging software, and backup/recovery tools that can override normal security controls. You need documented policies defining which programs qualify as privileged, who is authorized to use them, and continuous monitoring to detect unauthorized or suspicious usage.
How to comply
- 1.Identify and inventory all privileged utility programs across your infrastructure, including OS-level tools, system utilities, and third-party administrative software.
- 2.Define clear authorization criteria and maintain an access control list specifying which roles and individuals may use each privileged utility.
- 3.Implement technical controls to restrict execution—use application whitelisting, file permissions, or privilege management software to prevent unauthorized use.
- 4.Enable comprehensive logging and monitoring of all privileged utility program execution, including who, what, when, and why.
- 5.Conduct regular access reviews (at least annually) to revoke unnecessary permissions and validate that authorization levels remain appropriate.
- 6.Document all policies, procedures, and access decisions related to privileged utility programs in your information security documentation.
Evidence auditors look for
- Privileged utility program inventory with business justification for each tool.
- Access control policy defining role-based authorization for privileged utilities.
- Role-based access control (RBAC) configuration showing restriction of privileged program execution.
- Audit logs showing execution of privileged utilities with timestamps and user identifiers.
- Monitoring alerts or reports detecting unauthorized attempts to use privileged programs.
- Access review documentation showing periodic validation of who has privileged utility permissions.
- Technical implementation evidence (e.g., AppLocker policies, SELinux rules, or PAM configurations).
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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