STIGQter: STIG Summary: Layer 2 Switch Security Requirements Guide Version: 1 Release: 6 Benchmark Date: 24 Jan 2020:

The layer 2 switch must have the native VLAN assigned to an ID other than the default VLAN for all 802.1q trunk links.

DISA Rule

SV-76701r1_rule

Vulnerability Number

V-62211

Group Title

SRG-NET-000512

Rule Version

SRG-NET-000512-L2S-000012

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

To ensure the integrity of the trunk link and prevent unauthorized access, the ID of the native VLAN of the trunk port must be changed from the default VLAN (i.e., VLAN 1) to its own unique VLAN ID. The native VLAN ID must be the same on both ends of the trunk link; otherwise, traffic could accidentally leak between broadcast domains.

Note: An alternative to configuring a dedicated native VLAN is to ensure that all native VLAN traffic is tagged. This will mitigate the risk of VLAN hopping since there will always be an outer tag for native traffic as it traverses an 802.1q trunk link.

Check Contents

Review the switch configurations and examine all trunk links. Verify the native VLAN has been configured to a VLAN ID other than the ID of the default VLAN (i.e. VLAN 1).

If the native VLAN has the same VLAN ID as the default VLAN, this is a finding.

Vulnerability Number

V-62211

Documentable

False

Rule Version

SRG-NET-000512-L2S-000012

Severity Override Guidance

Review the switch configurations and examine all trunk links. Verify the native VLAN has been configured to a VLAN ID other than the ID of the default VLAN (i.e. VLAN 1).

If the native VLAN has the same VLAN ID as the default VLAN, this is a finding.

Check Content Reference

M

Target Key

2917

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