Cisco IOS Router RTR Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Cisco perimeter router must be configured drop IPv6 packets with a Routing Header type 0, 1, or 3–255.
The routing header can be used maliciously to send a packet through a path where less robust security is in place, rather than through the presumably preferred path of routing protocols. Use of the...Rule Medium Severity -
SRG-NET-000018-RTR-000001
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SRG-NET-000168-RTR-000078
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SRG-NET-000019-RTR-000007
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The Cisco router must be configured to have all inactive interfaces disabled.
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 Low Severity -
SRG-NET-000362-RTR-000109
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SRG-NET-000362-RTR-000110
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The Cisco router must be configured to protect against or limit the effects of denial-of-service (DoS) attacks by employing control plane protection.
The Route Processor (RP) is critical to all network operations because it is the component used to build all forwarding paths for the data plane via control plane processes. It is also instrumental...Rule High Severity -
SRG-NET-000362-RTR-000111
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The Cisco router must be configured to have Gratuitous ARP disabled on all external interfaces.
A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the network about a host IP address. A spoofed gratuitous ARP message can c...Rule Medium Severity -
SRG-NET-000362-RTR-000112
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SRG-NET-000362-RTR-000113
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The Cisco router must be configured to have Internet Control Message Protocol (ICMP) unreachable messages 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
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SRG-NET-000362-RTR-000115
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The Cisco router must be configured to have Internet Control Message Protocol (ICMP) redirect messages 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-000078-RTR-000001
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The Cisco router must be configured to log all packets that have been dropped at interfaces via an ACL.
Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being done or attempted to be done, and by whom, to compile an accurate ...Rule Low Severity -
SRG-NET-000076-RTR-000001
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SRG-NET-000077-RTR-000001
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The Cisco router must be configured to produce audit records containing information to establish the source of the events.
Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessmen...Rule Medium Severity -
SRG-NET-000019-RTR-000001
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SRG-NET-000202-RTR-000001
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The Cisco perimeter router must be configured to deny network traffic by default and allow network traffic by exception.
A deny-all, permit-by-exception network communications traffic policy ensures that only connections that are essential and approved are allowed. This requirement applies to both inbound and outbou...Rule High Severity -
SRG-NET-000019-RTR-000002
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SRG-NET-000364-RTR-000109
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SRG-NET-000364-RTR-000110
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The Cisco perimeter router must be configured to block inbound packets with source Bogon IP address prefixes.
Packets with Bogon IP source addresses should never be allowed to traverse the IP core. Bogon IP networks are RFC1918 addresses or address blocks that have never been assigned by the IANA or have b...Rule Medium Severity -
SRG-NET-000019-RTR-000008
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SRG-NET-000019-RTR-000009
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The Cisco perimeter router must be configured to not be a Border Gateway Protocol (BGP) peer to an approved gateway service provider.
ISPs use BGP to share route information with other autonomous systems (i.e., other ISPs and corporate networks). If the perimeter router was configured to BGP peer with an ISP, NIPRNet routes could...Rule High Severity -
SRG-NET-000019-RTR-000010
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The Cisco perimeter router must be configured to not redistribute static routes to an approved gateway service provider into BGP, an IGP peering with the NIPRNet, or other autonomous systems.
If the static routes to the approved gateway are being redistributed into an Exterior Gateway Protocol or Interior Gateway Protocol to a NIPRNet gateway, this could make traffic on NIPRNet flow to ...Rule Low Severity -
SRG-NET-000205-RTR-000003
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SRG-NET-000205-RTR-000004
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The Cisco perimeter router must be configured to filter ingress traffic at the external interface on an inbound direction.
Access lists are used to separate data traffic into that which it will route (permitted packets) and that which it will not route (denied packets). Secure configuration of routers makes use of acce...Rule Medium Severity -
SRG-NET-000205-RTR-000005
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SRG-NET-000364-RTR-000111
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The Cisco perimeter router must be configured to have Link Layer Discovery Protocol (LLDP) disabled on all external interfaces.
LLDP is a neighbor discovery protocol used to advertise device capabilities, configuration information, and device identity. LLDP is media- and protocol-independent as it runs over layer 2; therefo...Rule Low Severity -
SRG-NET-000364-RTR-000111
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SRG-NET-000364-RTR-000112
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The Cisco perimeter router must be configured to have Proxy ARP disabled on all external interfaces.
When Proxy ARP is enabled on a router, it allows that router to extend the network (at Layer 2) across multiple interfaces (LAN segments). Because proxy ARP allows hosts from different LAN segments...Rule Medium Severity -
SRG-NET-000364-RTR-000113
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The Cisco perimeter router must be configured to block all outbound management traffic.
For in-band management, the management network must have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes, such as routers and firewalls. Managemen...Rule Medium Severity -
SRG-NET-000205-RTR-000009
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SRG-NET-000205-RTR-000010
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The Cisco out-of-band management (OOBM) gateway router must be configured to forward only authorized management traffic to the Network Operations Center (NOC).
The OOBM network is an IP network used exclusively for the transport of OAM&P data from the network being managed to the OSS components located at the NOC. Its design provides connectivity to each ...Rule Medium Severity -
SRG-NET-000019-RTR-000011
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The Cisco out-of-band management (OOBM) gateway router must be configured to have separate IGP instances for the managed network and management network.
If the gateway router is not a dedicated device for the OOBM network, implementation of several safeguards for containment of management and production traffic boundaries must occur. Since the mana...Rule Medium Severity -
SRG-NET-000019-RTR-000012
Group
Node 2
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