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) redirects disabled on all external interfaces.

DISA Rule

SV-265443r999917_rule

Vulnerability Number

V-265443

Group Title

SRG-NET-000362-RTR-000115

Rule Version

NT0R-4X-000066

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). Under "Services", select "ICMP Redirect", and then click "Apply".

To enable logging, under the "Applied To" field, select the target Tier-0 gateways' external interfaces, and then 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 menu.

Review each Tier-0 Gateway Firewalls rules to verify one exists to drop ICMP redirects.

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

The NSX Tier-0 Gateway router must be configured to have Internet Control Message Protocol (ICMP) redirects 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