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The Cisco switch must be configured to disable non-essential capabilities.


Overview

Finding ID Version Rule ID IA Controls Severity
V-220648 CISC-L2-000010 SV-220648r539671_rule Medium
Description
A compromised switch 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 breaches from within is dependent on implementing a comprehensive defense-in-depth strategy, including securing each device connected to the network. This is accomplished by following and implementing all security guidance applicable for each node type. A fundamental step in securing each switch is to enable only the capabilities required for operation.
STIG Date
Cisco IOS XE Switch L2S Security Technical Implementation Guide 2021-03-24

Details

Check Text ( C-22363r507492_chk )
Review the switch configuration to verify that the switch does not have any unnecessary or non-secure services enabled. For example, the following commands should not be in the configuration:

boot network
ip boot server
ip bootp server
ip dns server
ip identd
ip finger
ip http server
ip rcmd rcp-enable
ip rcmd rsh-enable
service config
service finger
service tcp-small-servers
service udp-small-servers
service pad

Note: ip http server can be enabled provided that the "ip http active-session-modules none" command is configured for scenarios such as ISE sending URL redirects to the switch.

If any unnecessary services are enabled, this is a finding.
Fix Text (F-22352r507493_fix)
Disable the following services if enabled as shown in the example below:

SW2(config)#no boot network
SW2(config)#no ip boot server
SW2(config)#no ip bootp server
SW2(config)#no ip dns server
SW2(config)#no ip identd
SW2(config)#no ip finger
SW2(config)#no ip http server
SW2(config)#no ip rcmd rcp-enable
SW2(config)#no ip rcmd rsh-enable
SW2(config)#no service config
SW2(config)#no service finger
SW2(config)#no service tcp-small-servers
SW2(config)#no service udp-small-servers
SW2(config)#no service pad