The Arista network device must enforce approved authorizations for controlling the flow of management information within the network device based on information flow control policies.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-255948	ARST-ND-000110	SV-255948r882186_rule		Medium

Description
A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If management information flow is not enforced based on approved authorizations, the network device may become compromised. Information flow control regulates where management information is allowed to travel within a network device. The flow of all management information must be monitored and controlled so it does not introduce any unacceptable risk to the network device or data. Application-specific examples of enforcement occur in systems that employ rule sets or establish configuration settings that restrict information system services or message-filtering capability based on message content (e.g., implementing key word searches or using document characteristics). Applications providing information flow control must be able to enforce approved authorizations for controlling the flow of management information within the system in accordance with applicable policy.

Description

A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If management information flow is not enforced based on approved authorizations, the network device may become compromised. Information flow control regulates where management information is allowed to travel within a network device. The flow of all management information must be monitored and controlled so it does not introduce any unacceptable risk to the network device or data. Application-specific examples of enforcement occur in systems that employ rule sets or establish configuration settings that restrict information system services or message-filtering capability based on message content (e.g., implementing key word searches or using document characteristics). Applications providing information flow control must be able to enforce approved authorizations for controlling the flow of management information within the system in accordance with applicable policy.

STIG	Date
Arista MLS EOS 4.2x NDM Security Technical Implementation Guide	2023-01-11

Details

Check Text ( C-59624r882184_chk )
Verify the Arista network device is configured with access control lists to control the flow of management information. Step 1: Verify SSH has an inbound ACL applied as shown in the example below. sh run \| sec management ssh ip access-group MGMT_NETWORK in Step 2: Verify the ACL permits only hosts from the management network to access the device. sh run \| sec access-list MGMT_NETWORK ip access-list MGMT_NETWORK 10 permit ip 10.1.12.0/24 any 20 deny ip any any log If the Arista network device is not configured to enforce approved authorizations for controlling the flow of management information within the device based on control policies, this is a finding.

Check Text ( C-59624r882184_chk )

Verify the Arista network device is configured with access control lists to control the flow of management information.

Step 1: Verify SSH has an inbound ACL applied as shown in the example below.

sh run | sec management ssh
ip access-group MGMT_NETWORK in

Step 2: Verify the ACL permits only hosts from the management network to access the device.

sh run | sec access-list MGMT_NETWORK
ip access-list MGMT_NETWORK
10 permit ip 10.1.12.0/24 any
20 deny ip any any log

If the Arista network device is not configured to enforce approved authorizations for controlling the flow of management information within the device based on control policies, this is a finding.

Fix Text (F-59567r882185_fix)
Step 1: Configure an ACL for SSH access using the following commands: switch(config)#ip access-list MGMT_NETWORK switch(config-acl-MGMT_NETWORK)#10 permit ip 10.1.12.0/24 any switch(config-acl-MGMT_NETWORK)#20 deny ip any any log switch(config-acl-MGMT_NETWORK)#exit Step 2: Apply the ACL to management ssh. switch(config)#management ssh switch(config-mgmt-ssh)#ip access-group MGMT_NETWORK in switch(config-mgmt-ssh)#exit

Fix Text (F-59567r882185_fix)

Step 1: Configure an ACL for SSH access using the following commands:

switch(config)#ip access-list MGMT_NETWORK
switch(config-acl-MGMT_NETWORK)#10 permit ip 10.1.12.0/24 any
switch(config-acl-MGMT_NETWORK)#20 deny ip any any log
switch(config-acl-MGMT_NETWORK)#exit

Step 2: Apply the ACL to management ssh.

switch(config)#management ssh
switch(config-mgmt-ssh)#ip access-group MGMT_NETWORK in
switch(config-mgmt-ssh)#exit