Cisco IOS XE Release 3 RTR Security Technical Implementation Guide

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: [email protected]

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Version / Release: V1R3

Published: 2018-02-20

Updated At: 2018-09-23 19:12:44

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Drop CKL or SCAP (XCCDF) results here.

    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-88769r2_rule CISR-RT-000001 CCI-001414 MEDIUM The Cisco IOS XE router must enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy. Information flow control regulates authorized information to travel within a network and between interconnected networks. Controlling the flow of network traffic is critical so it does not introduce any unacceptable risk to the network infrastructure or d
    SV-88771r2_rule CISR-RT-000002 CCI-001414 MEDIUM The Cisco IOS XE router must 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 multicast group's data is permitted to flow is an important firs
    SV-88773r2_rule CISR-RT-000003 CCI-001414 MEDIUM The Cisco IOS XE router must bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled. Protocol Independent Multicast (PIM) is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infrastructure. Protocol Independent Multicast traffic must be limited to only known PIM neighbors by
    SV-88777r2_rule CISR-RT-000004 CCI-001414 MEDIUM The Cisco IOS XE router must establish boundaries for IPv6 Admin-Local, IPv6 Site-Local, IPv6 Organization-Local scope, and IPv4 Local-Scope multicast traffic. If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or unintended personnel. Administrative scoped multicast addresses are locally assigned and are to be used exclusively by the enterp
    SV-88779r2_rule CISR-RT-000005 CCI-001414 MEDIUM The Cisco IOS XE router must be configured so inactive interfaces are 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 gain access to a router by connecting to a configured interf
    SV-88781r2_rule CISR-RT-000006 CCI-001414 HIGH The Cisco IOS XE router must protect an enclave connected to an Alternate Gateway by using an inbound filter that only permits packets with destination addresses within the sites address space. Enclaves with Alternate Gateway connections must take additional steps to ensure there is no compromise on the enclave network or NIPRNet. Without verifying the destination address of traffic coming from the site's Alternate Gateway, the perimeter router
    SV-88783r2_rule CISR-RT-000007 CCI-001414 MEDIUM The Cisco IOS XE router must not be a BGP peer with a router from an Autonomous System belonging to any Alternate Gateway. The perimeter router will not use a routing protocol to advertise NIPRNet addresses to Alternate Gateways. Most ISPs use Border Gateway Protocol (BGP) to share route information with other autonomous systems, that is, any network under a different adminis
    SV-88785r2_rule CISR-RT-000008 CCI-001414 MEDIUM The Cisco IOS XE router must not redistribute static routes to alternate gateway service provider into an Exterior Gateway Protocol or Interior Gateway Protocol to the NIPRNet or to other Autonomous System. If the static routes to the alternate 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 that particular router and not to the Internet Access Poi
    SV-88787r2_rule CISR-RT-000009 CCI-001414 MEDIUM The Cisco IOS XE router must enforce that Interior Gateway Protocol instances configured on the out-of-band management gateway router only peer with their own routing domain. If the gateway router is not a dedicated device for the out-of-band management network, implementation of several safeguards for containment of management and production traffic boundaries must occur. Since the managed and management network are separate
    SV-88789r2_rule CISR-RT-000010 CCI-001414 MEDIUM The Cisco IOS XE router must enforce that the managed network domain and the management network domain are separate routing domains and the Interior Gateway Protocol instances are not redistributed or advertised to each other. If the gateway router is not a dedicated device for the out-of-band management network, several safeguards must be implemented for containment of management and production traffic boundaries, otherwise, it is possible that management traffic will not be s
    SV-88791r2_rule CISR-RT-000011 CCI-001414 MEDIUM The Cisco IOS XE router must enforce that any interface used for out-of-band management traffic is configured to be passive for the Interior Gateway Protocol that is utilized on that management interface. The out-of-band management access switch will connect to the management interface of the managed network elements. The management interface can be a true out-of-band management interface or a standard interface functioning as the management interface. In
    SV-88793r2_rule CISR-RT-000012 CCI-000366 MEDIUM The Cisco IOS XE router must enable neighbor router authentication for 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 learn confidential information about the site's network, or
    SV-88795r2_rule CISR-RT-000013 CCI-000366 MEDIUM The Cisco IOS XE router must be configured so that any key used for authenticating Interior Gateway Protocol peers does not have a duration exceeding 180 days. If the keys used for routing protocol authentication are guessed, the malicious user could create havoc within the network by advertising incorrect routes and redirecting traffic. Some routing protocols allow the use of key chains for authentication. A ke
    SV-88797r2_rule CISR-RT-000014 CCI-001094 MEDIUM The Cisco IOS XE router must be configured to restrict it from accepting outbound IP packets that contain an illegitimate address in the source address field via egress filter or by enabling Unicast Reverse Path Forwarding. A compromised host in an enclave can be used by a malicious actor as a platform to launch cyber attacks on third parties. This is a common practice in "botnets", which are a collection of compromised computers using malware to attack (usually DDoS) other
    SV-88799r2_rule CISR-RT-000015 CCI-000381 MEDIUM The Cisco IOS XE router must be configured to disable non-essential capabilities. 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 attacks by malicious users within the network. Preventing network
    SV-88801r2_rule CISR-RT-000016 CCI-000803 MEDIUM The Cisco IOS XE router must encrypt all methods of configured authentication for routing 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 learn confidential information about the site's network, or
    SV-88803r2_rule CISR-RT-000018 CCI-002385 MEDIUM The Cisco IOS XE router must ensure all Exterior Border Gateway Protocol (eBGP) routers are configured to use Generalized TTL Security Mechanism (GTSM). As described in RFC 3682, Generalized TTL Security Mechanism (GTSM) is designed to protect a router's IP-based control plane from DoS attacks. Many attacks focused on CPU load and line-card overload can be prevented by implementing GTSM on all Exterior Bo
    SV-88805r2_rule CISR-RT-000019 CCI-001095 MEDIUM The Cisco IOS XE router must manage excess bandwidth to limit the effects of packet flooding types of denial of service (DoS) attacks. Denial of service is a condition when a resource is not available for legitimate users. Packet flooding DDoS attacks are referred to as volumetric attacks and have the objective of overloading a network or circuit to deny or seriously degrade performance,
    SV-88807r2_rule CISR-RT-000020 CCI-002403 MEDIUM The Cisco IOS XE router must have IP source routing disabled. Source routing is a feature of IP, whereby individual packets can specify routes. This feature is used in several different network attacks by bypassing perimeter and internal defense mechanisms.
    SV-88809r2_rule CISR-RT-000021 CCI-002403 MEDIUM The Cisco IOS XE router must restrict BGP connections to known IP addresses of neighbor routers from trusted Autonomous Systems (AS). Advertisement of routes by an Autonomous System for networks that do not belong to any of its trusted peers pulls traffic away from the authorized network. This causes a DoS on the network that allocated the block of addresses and may cause a DoS on the n
    SV-88811r2_rule CISR-RT-000022 CCI-001097 MEDIUM The Cisco IOS XE router must configure the maximum hop limit value to at least 32. The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message to be used by hosts instead of the standardized default value. If a very small value was configured and advertised to hosts on the LAN s
    SV-88813r2_rule CISR-RT-000024 CCI-002385 MEDIUM The Cisco IOS XE router must 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 with ongoing network management functions that keep the r
    SV-88815r2_rule CISR-RT-000025 CCI-002403 MEDIUM The Cisco IOS XE router must only allow incoming communications from authorized sources to be routed to authorized destinations. Unrestricted traffic may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth and other resources. Traffic can be restricted directly by