STIGQter: STIG Summary: VMware NSX-T Tier-0 Gateway RTR Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 02 Sep 2022:

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

DISA Rule

SV-251754r856695_rule

Vulnerability Number

V-251754

Group Title

SRG-NET-000362-RTR-000114

Rule Version

T0RT-3X-000065

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-T Manager web interface, go to Security >> Gateway Firewall >> All Shared Rules.

Click "Add Rule" (Add a policy first if needed), under "Services" select the custom service that identifies ICMP mask replies, and then click "Apply".

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

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

Note: A pre-created service for ICMP mask replies does not exist by default and may need to be created.

Check Contents

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

From the NSX-T Manager web interface, go to Security >> 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 mask replies.

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

The NSX-T Tier-0 Gateway must be configured to have Internet Control Message Protocol (ICMP) mask replies 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