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JUEX-NM-000010 - The Juniper EX switch must be configured to limit the number of concurrent management sessions to 1 or an organization-defined value.

Information

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 based on account type, role, or access type is helpful in limiting risks related to denial-of-service (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 must be defined based upon mission needs and the operational environment for each system. At a minimum, limits must be set for SSH, HTTPS, account of last resort, and root account sessions.

Juniper switches apply session limits per access method (e.g., web management, SSH), which means the limit is applicable to local, remote, and root account sessions.

Unconfigured management access methods are disabled. For instance, if there is no [edit system services ssh] stanza, that service is unavailable and a connection-limit should not be configured because that will enable the service.

Solution

Configure the switch to limit connection limits for all enabled administrative access methods to "1" or an organization-defined value documented in the SSP.

1. Enter configuration mode.
2. Configure enabled administrative access methods to "1" or an organizationally defined value documented in the SSP.
3. Commit the configuration.

SSH example limiting connections to 1:
user@host> configure
Entering configuration mode

user@host# set system services ssh connection-limit 1
or
user@host# set system services ssh connection-limit <documented organizationally defined value>

user@host# commit
commit complete

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_EX_Switches_Y26M07_STIG.zip

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-10, CAT|II, CCI|CCI-000054, Rule-ID|SV-253878r1212002_rule, STIG-ID|JUEX-NM-000010, Vuln-ID|V-253878

Plugin: Juniper

Control ID: aee99d8eacb0e8c3a8f91517b4d25c4fba17de09b84877a4a84dcc71776916dc