I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000148-L2S-000015
Group -
The Cisco switch must uniquely identify and authenticate all network-connected endpoint devices before establishing any connection.
Controlling LAN access via 802.1x authentication can assist in preventing a malicious user from connecting an unauthorized PC to a switch port to inject or receive data from the network without det...Rule High Severity -
SRG-NET-000168-L2S-000019
Group -
The Cisco switch must authenticate all VLAN Trunk Protocol (VTP) messages with a hash function using the most secured cryptographic algorithm available.
VTP provides central management of VLAN domains, thus reducing administration in a switched network. When configuring a new VLAN on a VTP server, the VLAN is distributed through all switches in the...Rule Medium Severity -
SRG-NET-000193-L2S-000020
Group -
The Cisco switch 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 distributed DoS (DDoS) attacks are referred to as volumetric attacks and have the objective o...Rule Medium Severity -
SRG-NET-000362-L2S-000021
Group -
The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches.
Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the switched network. Any switch can be the root bridge in a network. Howev...Rule Low Severity -
SRG-NET-000362-L2S-000022
Group -
The Cisco switch must have Bridge Protocol Data Unit (BPDU) Guard enabled on all user-facing or untrusted access switch ports.
If a rogue switch is introduced into the topology and transmits a BPDU with a lower bridge priority than the existing root bridge, it will become the new root bridge and cause a topology change, re...Rule Medium Severity -
SRG-NET-000362-L2S-000023
Group -
The Cisco switch must have Spanning Tree Protocol (STP) Loop Guard enabled.
The STP loop guard feature provides additional protection against STP loops. An STP loop is created when an STP blocking port in a redundant topology erroneously transitions to the forwarding state...Rule Medium Severity -
SRG-NET-000362-L2S-000024
Group -
The Cisco switch must have Unknown Unicast Flood Blocking (UUFB) enabled.
Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN number and the destination MAC address of the frame. When a router has an ...Rule Medium Severity -
SRG-NET-000362-L2S-000025
Group -
The Cisco switch must have DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources.
In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, routers, and servers in the network. Host ports and unknown DHCP servers are ...Rule Medium Severity -
SRG-NET-000362-L2S-000026
Group -
The Cisco switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports.
IP Source Guard provides source IP address filtering on a Layer 2 port to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP address. The feature use...Rule Medium Severity -
SRG-NET-000362-L2S-000027
Group -
The Cisco switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.
DAI intercepts ARP requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the packet to the appropriate des...Rule Medium Severity
Node 2
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