STIGQter: STIG Summary: VMware NSX 4.x Tier-0 Gateway Router Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 30 Jan 2025:

The NSX Tier-0 Gateway router must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.

DISA Rule

SV-265441r999915_rule

Vulnerability Number

V-265441

Group Title

SRG-NET-000362-RTR-000113

Rule Version

NT0R-4X-000064

Severity

CAT II

CCI(s)

CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

Fix Recommendation

To configure a shared rule to drop ICMP unreachable messages, do the following:

From the NSX Manager web interface, go to Security >> Policy Management >> Gateway Firewall >> All Shared Rules.

Click "Add Rule" (add a policy first, if needed) and under "Services", select "ICMP Destination Unreachable" and "Apply".

Enable logging and under the "Applied To" field select the target Tier-0 gateways and click "Publish" to enforce the new rule.

Note: A rule can also be created under Gateway Specific Rules to meet this requirement.

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If the Tier-0 Gateway is deployed in an Active/Active HA mode, this is Not Applicable.

From the NSX Manager web interface, go to Security >> Policy Management >> Gateway Firewall >> Gateway Specific Rules, and choose each Tier-0 Gateway in the drop-down.

Review each Tier-0 Gateway Firewall rule to verify one exists to drop ICMP unreachable messages.

If a rule does not exist to drop ICMP unreachable messages, this is a finding.

The NSX Tier-0 Gateway router must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.

DISA Rule

Vulnerability Number

Group Title

Rule Version

Severity

CCI(s)

Weight

Fix Recommendation

Check Contents

Vulnerability Number

Documentable

Rule Version

Severity Override Guidance

Check Content Reference

Target Key