ISO 27001 Compliance
ID-02High

Block Legacy Authentication for ISO 27001 Compliance

Learn how ID-02 helps you meet ISO 27001 requirements for Microsoft 365 and Entra ID security.

Meeting ISO 27001 standards for Microsoft 365 involves implementing controls like ID-02 (Block Legacy Authentication). This guide covers the specific ISO 27001 requirements addressed by this control and how to achieve compliance.

How ID-02 Addresses ISO 27001 Requirements

ISO 27001 requires organizations to implement controls around block legacy authentication. The ID-02 control provides:

  • A Conditional Access policy blocks legacy authentication protocols (IMAP, POP3, SMTP, older Office clients)
  • No exceptions for legacy protocols except documented service accounts

These measures directly support ISO 27001 compliance by ensuring proper identity security in your Microsoft 365 environment.

Implementation for Compliance

To satisfy ISO 27001 requirements with this control:

  • **Enable the control** - Use TrueConfig's one-click remediation
  • **Document your implementation** - Record how the control was configured
  • **Maintain evidence** - TrueConfig automatically logs compliance status
  • **Monitor continuously** - Track any deviations from the expected state

Evidence Collection

For ISO 27001 audits, you'll need to demonstrate:

  • Current configuration state
  • Historical compliance data
  • Remediation actions taken
  • Continuous monitoring in place

TrueConfig provides all of this evidence through its audit trail and reporting features.

Why This Control Matters for ISO 27001

Legacy protocols like IMAP and POP3 cannot enforce MFA. Attackers specifically target these protocols to bypass your MFA policies. Blocking them closes a major attack vector.

Implementing ID-02 is an important step toward ISO 27001 compliance. Combined with TrueConfig's continuous monitoring, you can demonstrate ongoing adherence to ISO 27001 requirements.

Ready to achieve ISO 27001 compliance?

TrueConfig continuously monitors your Microsoft 365 tenant for compliance with ISO 27001 requirements, including this control.