The Cisco IOS XE router must limit the number of concurrent SSH sessions to an organization-defined number.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73961	CISR-ND-000001	SV-88635r2_rule		Low

Description

Device management includes the ability to control the number of administrators and management sessions that manage a device. Limiting the number of allowed administrators and sessions per administrator is helpful in limiting risks related to DoS attacks. This requirement addresses concurrent sessions for administrative accounts and does not address concurrent sessions by a single administrator via multiple administrative accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system.

STIG	Date
Cisco IOS XE Release 3 NDM Security Technical Implementation Guide	2018-12-20

Details

Check Text ( C-74043r3_chk )

Review the Cisco IOS XE router configuration to see if the device limits the number of concurrent SSH sessions to an organization-defined number. The following commands should be in the configuration: line vty 0 1 exec-timeout 60 0 session-limit 2 login authentication TEST transport input ssh transport output ssh line vty 2 4 exec-timeout 60 0 session-limit 2 login authentication TEST transport input none transport output none If the number of concurrent sessions are not limited, this is a finding.

Fix Text (F-80501r3_fix)

Configure the Cisco IOS XE router to limit the number of concurrent SSH sessions to an organization-defined number. The configuration will look similar to the example below: line vty 0 1 exec-timeout 60 0 session-limit 2 login authentication TEST transport input ssh transport output ssh line vty 2 4 exec-timeout 60 0 session-limit 2 login authentication TEST transport input none transport output none