Check: CISR-ND-000001
Cisco IOS XE Release 3 NDM STIG:
CISR-ND-000001
(in versions v1 r5 through v1 r4)
Title
The Cisco IOS XE router must limit the number of concurrent SSH sessions to an organization-defined number. (Cat III impact)
Discussion
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.
Check Content
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
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
Additional Identifiers
Rule ID: SV-88635r2_rule
Vulnerability ID: V-73961
Group Title: SRG-APP-000001-NDM-000200
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000054 |
The information system limits the number of concurrent sessions for each organization-defined account and/or account type to an organization-defined number of sessions. |
Controls
Number | Title |
---|---|
AC-10 |
Concurrent Session Control |