The Arista network device must terminate all network connections associated with a device management session at the end of the session, or the session must be terminated after 10 minutes of inactivity except to fulfill documented and validated mission requirements.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-255956	SRG-APP-000190-NDM-000267	ARST-ND-000490	SV-255956r991784_rule	2025-02-20	2

Description
Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level, or de-allocating networking assignments at the application level if multiple application sessions are using a single, operating system-level network connection. This does not mean that the device terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-APP-000190-NDM-000267, SRG-APP-000186-NDM-000266

Description

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level, or de-allocating networking assignments at the application level if multiple application sessions are using a single, operating system-level network connection. This does not mean that the device terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-APP-000190-NDM-000267, SRG-APP-000186-NDM-000266

ℹ️ Check
Verify the Arista device is configured for 10-minute inactivity timeout for management sessions. switch#sh run \| section management ! interface Management1 ip address 172.28.134.55/20 ! management console idle-timeout 10 ! management ssh idle-timeout 10 ! If the Arista network device is not configured to terminate the connection associated with a device management session at the end of the session or after 10 minutes of inactivity, this is a finding.

ℹ️ Check

Verify the Arista device is configured for 10-minute inactivity timeout for management sessions. switch#sh run | section management ! interface Management1 ip address 172.28.134.55/20 ! management console idle-timeout 10 ! management ssh idle-timeout 10 ! If the Arista network device is not configured to terminate the connection associated with a device management session at the end of the session or after 10 minutes of inactivity, this is a finding.

✔️ Fix
Configure the Arista network device to terminate the connections after 10 minutes of inactivity. Step 1: Configure the settings for the console. switch(config)#management console switch(config-mgmt-console)#idle-timeout 10 switch(config-mgmt-console)#exit switch(config)# ! Step 2: Configure the settings for SSH. switch(config)#management ssh switch(config-mgmt-ssh)#idle-timeout 10 switch(config-mgmt-console)#exit switch(config)# !

✔️ Fix

Configure the Arista network device to terminate the connections after 10 minutes of inactivity. Step 1: Configure the settings for the console. switch(config)#management console switch(config-mgmt-console)#idle-timeout 10 switch(config-mgmt-console)#exit switch(config)# ! Step 2: Configure the settings for SSH. switch(config)#management ssh switch(config-mgmt-ssh)#idle-timeout 10 switch(config-mgmt-console)#exit switch(config)# !