VMware NSX-T Tier-0 Gateway RTR Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The NSX-T Tier-0 Gateway must be configured to reject inbound route advertisements for any prefixes belonging to the local autonomous system (AS).
Accepting route advertisements belonging to the local AS can result in traffic looping or being black holed, or at a minimum using a non-optimized path.Rule Medium Severity -
The NSX-T Tier-0 Gateway must be configured to have the DHCP service disabled if not in use.
A compromised router introduces risk to the entire network infrastructure, as well as data resources that are accessible via the network. The perimeter defense has no oversight or control of attack...Rule Low Severity -
The NSX-T Tier-0 Gateway must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.
DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS) attacks are referred to as volumetric attacks and have the objective o...Rule Medium Severity -
The NSX-T Tier-0 Gateway must be configured to implement message authentication for all control plane protocols.
A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect or even a rogue destination. This diverted traffic could be analyzed to l...Rule Medium Severity -
The NSX-T Tier-0 Gateway must be configured to use the BGP maximum prefixes feature to protect against route table flooding and prefix de-aggregation attacks.
The effects of prefix de-aggregation can degrade router performance due to the size of routing tables and also result in black-holing legitimate traffic. Initiated by an attacker or a misconfigured...Rule Medium Severity -
The NSX-T Tier-0 Gateway must be configured to have all inactive interfaces removed.
An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. If an interface is no longer used, the configuration must be deleted.Rule Low Severity -
SRG-NET-000131-RTR-000035
Group -
SRG-NET-000018-RTR-000003
Group -
SRG-NET-000019-RTR-000003
Group -
The NSX-T Tier-0 Gateway must be configured to disable Protocol Independent Multicast (PIM) on all interfaces that are not required to support multicast routing.
If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or unintended personnel. Limiting where, within the network, a given multic...Rule Medium Severity -
SRG-NET-000019-RTR-000007
Group -
SRG-NET-000193-RTR-000112
Group -
SRG-NET-000205-RTR-000001
Group -
The NSX-T Tier-0 Gateway must be configured to restrict traffic destined to itself.
The route processor handles traffic destined to the router, the key component used to build forwarding paths, and is also instrumental with all network management functions. Hence, any disruption o...Rule High Severity -
SRG-NET-000205-RTR-000014
Group -
Unicast Reverse Path Forwarding (uRPF) must be enabled on the NSX-T Tier-0 Gateway.
A compromised host in an enclave can be used by a malicious platform to launch cyber attacks on third parties. This is a common practice in "botnets", which are a collection of compromised computer...Rule High Severity -
SRG-NET-000230-RTR-000001
Group -
SRG-NET-000230-RTR-000002
Group -
The NSX-T Tier-0 Gateway must be configured to use a unique key for each autonomous system (AS) with which it peers.
If the same keys are used between eBGP neighbors, the chance of a hacker compromising any of the BGP sessions increases. It is possible that a malicious user exists in one autonomous system who wou...Rule Medium Severity -
SRG-NET-000362-RTR-000113
Group -
The NSX-T Tier-0 Gateway must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.
The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Host unreachable ICMP ...Rule Medium Severity -
SRG-NET-000362-RTR-000114
Group -
The NSX-T Tier-0 Gateway must be configured to have Internet Control Message Protocol (ICMP) mask replies disabled on all external interfaces.
The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Mask Reply ICMP messag...Rule Medium Severity -
SRG-NET-000362-RTR-000115
Group -
The NSX-T Tier-0 Gateway must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.
The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Redirect ICMP messages...Rule Medium Severity -
SRG-NET-000362-RTR-000117
Group -
SRG-NET-000512-RTR-000001
Group -
The NSX-T Tier-0 Gateway must be configured to use its loopback address as the source address for iBGP peering sessions.
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of the BGP routers. It is easier to construct appropriate ingress filters...Rule Low Severity -
SRG-NET-000131-RTR-000035
Group -
The NSX-T Tier-0 Gateway must be configured to have routing protocols disabled if not in use.
A compromised router introduces risk to the entire network infrastructure, as well as data resources that are accessible via the network. The perimeter defense has no oversight or control of attack...Rule Low Severity -
SRG-NET-000131-RTR-000035
Group -
The NSX-T Tier-0 Gateway must be configured to have multicast disabled if not in use.
A compromised router introduces risk to the entire network infrastructure, as well as data resources that are accessible via the network. The perimeter defense has no oversight or control of attack...Rule Low Severity
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