ASD ISM 0530 Administer VLANs from trusted security domains
What it says
Network devices managing VLANs are administered from the most trusted security domain.
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What it means
In plain EnglishVLANs must be managed from the most secure and trusted part of the network.
When managing Virtual Local Area Networks (VLANs), it's important they are controlled from the safest part of your network. If not done correctly, hackers or unauthorised people could change your network setup, leading to data theft or disruptions in your business operations.
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Why it matters
If VLANs are administered from less-trusted domains, attackers can alter VLAN configs or intercept management traffic, causing outages and breaches.
How to implement
Business owners should ensure that VLAN administration is limited to the most secure area of their network.
This might involve consulting with IT professionals to identify which network areas have the strongest protections and setting up VLAN management to only occur there.
IT managers need to configure network devices so that administrative actions can only be performed from trusted locations.
This includes using security measures like firewalls and encryption to guard against unauthorised access.
Network administrators should regularly update the security measures on devices used to manage VLANs.
This can be done by applying patches, updating passwords, and ensuring only selected individuals have administrative permissions.
Managers should perform routine checks to confirm that only authorised personnel have access to VLAN management tools.
This involves reviewing access logs and permissions to ensure they are up to date and appropriately restricted.
Organisational security leads should collaborate with IT teams to create policies that enforce strong security practices for VLAN management.
These policies should include guidelines on access controls and procedures for monitoring and responding to potential security breaches.
Keep it running
Administer VLAN changes only from the most trusted domain via a dedicated management network/jump host, and alert on unauthorised access.
Evidence and audit
- Check 1 of 5What an auditor asks for
Ask for
A network map showing VLAN management zones: Request documentation that maps out the network and highlights the sections from where VLAN administration is performed.
Look at
Distinct demarcations of trusted areas within the network.
Good evidence
Shows administrative actions being clearly restricted to these secured zones.
- Check 2 of 5What an auditor asks for
Good evidence
Limits access to highly secure locations or devices.
- Check 3 of 5What an auditor asks for
Ask for
The configuration settings of the devices managing VLANs: Request documented settings or screenshots.
Look at
Configurations that specify secure access methods like encryption and firewall rules.
Good evidence
Will have these settings actively applied.
- Check 4 of 5What an auditor asks for
Ask for
Logs of administrative access to VLAN management: Logs should capture details about who accessed the management tools and when.
Look at
Timestamps and authorised user names.
Good evidence
Shows logs reviewed regularly for anomalies.
- Check 5 of 5What an auditor asks for
Look at
Statements requiring VLAN management from secure areas.
Good evidence
Includes thorough procedures that align with security best practices.
Mappings
Closest match in ISO/IEC 27001: A.5.15, Access control policies and procedures, which this control partially meets.
ISO/IEC 27001: 3 mappings
This control partially meets A.5.15.
ISM-0530 requires a specific access rule: VLAN-managing network devices must be administered from the most trusted security domain. This fits within Annex A 5.15, which requires organisations to establish and implement rules for logical access based on business and security requirements. Annex A 5.15 is broader and covers access control policy and procedures across many asset types, while ISM-0530 is a specific policy requirement for the network management plane.
This control partially meets A.8.20.
ISM-0530 requires that network devices used to manage VLANs are administered only from the most trusted security domain. This relates directly to Annex A 8.20, which requires organisations to secure, manage and control networks and network devices to protect information. ISM-0530 is a specific administrative-access restriction for VLAN management, whereas Annex A 8.20 is broader and covers network/device security generally (including monitoring, hardening, and management controls beyond admin-origin).
This control depends on A.8.22.
ISM-0530 requires VLAN management interfaces and activities to be administered from the most trusted security domain. This supports Annex A 8.22 by reinforcing effective network segregation, because restricting where VLAN administration can occur reduces the chance that less-trusted segments can alter segmentation boundaries. Annex A 8.22 focuses on designing and implementing segregation itself, while ISM-0530 focuses on the administrative control plane used to manage that segregation.
Mappings show how controls relate across frameworks. They do not imply full equivalence or certification.