VMware NSX 4.x Tier-0 Gateway Router Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000019-RTR-000003
Group -
The NSX Tier-0 Gateway router 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 could be intercepted by unauthorized or unintended personnel. Limiting where within the network a given multicast group's data is ...Rule High Severity -
SRG-NET-000019-RTR-000007
Group -
The NSX Tier-0 Gateway router 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. Unauthorized personnel with access to the communication facility could ga...Rule High Severity -
SRG-NET-000131-RTR-000035
Group -
The NSX Tier-0 Gateway router must be configured to have the Dynamic Host Configuration Protocol (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 -
SRG-NET-000168-RTR-000077
Group -
The NSX Tier-0 Gateway router must be configured to use encryption for Open Shortest Path First (OSPF) routing protocol authentication.
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 High Severity -
SRG-NET-000205-RTR-000014
Group -
SRG-NET-000230-RTR-000001
Group -
SRG-NET-000230-RTR-000002
Group -
The NSX Tier-0 Gateway must be configured to use a unique password for each autonomous system (AS) with which it peers.
If the same keys are used between External Border Gateway Protocol (eBGP) neighbors, the chance of a hacker compromising any of the BGP sessions increases. It is possible that a malicious user exis...Rule Medium Severity -
SRG-NET-000362-RTR-000113
Group -
The NSX Tier-0 Gateway router 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 Tier-0 Gateway router 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 Tier-0 Gateway router 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 Tier-0 Gateway router must be configured to use its loopback address as the source address for Internal Border Gateway Protocol (IBGP) peering sessions.
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of the Border Gateway Protocol (BGP) routers. It is easier to construct a...Rule Low Severity -
SRG-NET-000512-RTR-000012
Group -
The NSX Tier-0 Gateway router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless auto-configuration deployments.
The Neighbor Discovery (ND) protocol allows a hop limit value to be advertised by routers in a Router Advertisement message being used by hosts instead of the standardized default value. If a very ...Rule Low Severity -
SRG-NET-000131-RTR-000035
Group -
The NSX Tier-0 Gateway router 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 Tier-0 Gateway router 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 -
SRG-NET-000168-RTR-000077
Group -
The NSX Tier-0 Gateway router must be configured to restrict it from accepting outbound IP packets that contain an illegitimate address in the source address field by enabling Unicast Reverse Path Forwarding (uRPF).
A malicious platform can use a compromised host in an enclave to launch cyberattacks on third parties. This is a common practice in "botnets", which are a collection of compromised computers using ...Rule High Severity -
The NSX Tier-0 Gateway router 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 a rogue destination. This diverted traffic could be analyzed to learn ...Rule High Severity -
The NSX Tier-0 Gateway router must be configured to use the Border Gateway Protocol (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 Tier-0 Gateway router must be configured to use encryption for border gateway protocol (BGP) routing protocol authentication.
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 High Severity
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