Cisco IOS Switch RTR Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000168-RTR-000078
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to enable routing protocol authentication using FIPS 198-1 algorithms with keys not exceeding 180 days of lifetime.
<VulnDiscussion>A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect o...Rule Medium Severity -
SRG-NET-000019-RTR-000007
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to have all inactive Layer 3 interfaces disabled.
<VulnDiscussion>An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. U...Rule Low Severity -
SRG-NET-000362-RTR-000109
<GroupDescription></GroupDescription>Group -
The Cisco switch must not be configured to have any zero-touch deployment feature enabled when connected to an operational network.
<VulnDiscussion>Network devices that are configured via a zero-touch deployment or auto-loading feature can have their startup configuration ...Rule Medium Severity -
SRG-NET-000362-RTR-000110
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to protect against or limit the effects of denial-of-service (DoS) attacks by employing control plane protection.
<VulnDiscussion>The Route Processor (RP) is critical to all network operations because it is the component used to build all forwarding paths...Rule High Severity -
SRG-NET-000362-RTR-000111
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to have gratuitous ARP disabled on all external interfaces.
<VulnDiscussion>A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the...Rule Medium Severity -
SRG-NET-000362-RTR-000112
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to have IP directed broadcast disabled on all interfaces.
<VulnDiscussion>An IP directed broadcast is a datagram sent to the broadcast address of a subnet that is not directly attached to the sending...Rule Low Severity -
SRG-NET-000362-RTR-000113
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) unreachable messages disabled on all external interfaces.
<VulnDiscussion>The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send...Rule Medium Severity -
SRG-NET-000362-RTR-000114
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) mask reply messages disabled on all external interfaces.
<VulnDiscussion>The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send...Rule Medium Severity -
SRG-NET-000362-RTR-000115
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.
<VulnDiscussion>The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send...Rule Medium Severity -
SRG-NET-000078-RTR-000001
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to log all packets that have been dropped at interfaces via an access control list (ACL).
<VulnDiscussion>Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is ...Rule Low Severity -
SRG-NET-000076-RTR-000001
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to produce audit records containing information to establish where the events occurred.
<VulnDiscussion>Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up t...Rule Medium Severity -
SRG-NET-000077-RTR-000001
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to produce audit records containing information to establish the source of the events.
<VulnDiscussion>Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up...Rule Medium Severity -
SRG-NET-000019-RTR-000001
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to disable the auxiliary port unless it is connected to a secured modem providing encryption and authentication.
<VulnDiscussion>The use of POTS lines to modems connecting to network devices provides clear text of authentication traffic over commercial c...Rule Low Severity -
SRG-NET-000202-RTR-000001
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to deny network traffic by default and allow network traffic by exception.
<VulnDiscussion>A deny-all, permit-by-exception network communications traffic policy ensures that only connections that are essential and ap...Rule High Severity -
SRG-NET-000019-RTR-000002
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.
<VulnDiscussion>Information flow control regulates authorized information to travel within a network and between interconnected networks. Con...Rule Medium Severity -
SRG-NET-000364-RTR-000109
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to only allow incoming communications from authorized sources to be routed to authorized destinations.
<VulnDiscussion>Unrestricted traffic may contain malicious traffic that poses a threat to an enclave or to other connected networks. Addition...Rule Medium Severity -
SRG-NET-000364-RTR-000110
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to block inbound packets with source Bogon IP address prefixes.
<VulnDiscussion>Packets with Bogon IP source addresses should never be allowed to traverse the IP core. Bogon IP networks are RFC1918 address...Rule Medium Severity -
SRG-NET-000205-RTR-000003
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to filter traffic destined to the enclave in accordance with the guidelines contained in DoD Instruction 8551.1.
<VulnDiscussion>Vulnerability assessments must be reviewed by the System Administrator, and protocols must be approved by the Information Ass...Rule Medium Severity -
SRG-NET-000205-RTR-000004
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to filter ingress traffic at the external interface on an inbound direction.
<VulnDiscussion>Access lists are used to separate data traffic into that which it will route (permitted packets) and that which it will not r...Rule Medium Severity -
SRG-NET-000205-RTR-000005
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to filter egress traffic at the internal interface on an inbound direction.
<VulnDiscussion>Access lists are used to separate data traffic into that which it will route (permitted packets) and that which it will not r...Rule Medium Severity -
SRG-NET-000364-RTR-000111
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to have Link Layer Discovery Protocol (LLDP) disabled on all external interfaces.
<VulnDiscussion>LLDP is a neighbor discovery protocol used to advertise device capabilities, configuration information, and device identity. ...Rule Low Severity -
SRG-NET-000364-RTR-000111
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to have Cisco Discovery Protocol (CDP) disabled on all external interfaces.
<VulnDiscussion>CDP is a Cisco proprietary neighbor discovery protocol used to advertise device capabilities, configuration information, and ...Rule Low Severity -
SRG-NET-000364-RTR-000112
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to have Proxy ARP disabled on all external interfaces.
<VulnDiscussion>When Proxy ARP is enabled on a switch, it allows that switch to extend the network (at Layer 2) across multiple interfaces (L...Rule Medium Severity -
SRG-NET-000364-RTR-000113
<GroupDescription></GroupDescription>Group -
The Cisco perimeter switch must be configured to block all outbound management traffic.
<VulnDiscussion>For in-band management, the management network must have its own subnet in order to enforce control and access boundaries pro...Rule Medium Severity -
SRG-NET-000205-RTR-000012
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured to only permit management traffic that ingresses and egresses the out-of-band management (OOBM) interface.
<VulnDiscussion>The OOBM access switch will connect to the management interface of the managed network elements. The management interface can...Rule Medium Severity
Node 2
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