The HYCU virtual appliance must limit the number of concurrent sessions to an organization-defined number for each administrator account and/or administrator account type.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-268219	SRG-APP-000001-NDM-000200	HYCU-ND-000010	SV-268219r1038638_rule	2024-10-29	1

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 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 should 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.

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 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 should 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.

ℹ️ Check
In the HYCU Web UI, only one login can be used at a time. If the user is still logged into the HYCU Web UI upon logging in to the Web UI again, in a different browser tab, with the same credentials, this is a finding. Log in to the HYCU VM console. To check the number of allowed concurrent session connections, grep file "/etc/security/limits.conf" by executing the following command: grep maxlogins /etc/security/limits.conf Verify the following line exists: hycu hard maxlogins 1 If the "maxlogins" value is not set to 1 or is missing, this is a finding.

ℹ️ Check

In the HYCU Web UI, only one login can be used at a time. If the user is still logged into the HYCU Web UI upon logging in to the Web UI again, in a different browser tab, with the same credentials, this is a finding. Log in to the HYCU VM console. To check the number of allowed concurrent session connections, grep file "/etc/security/limits.conf" by executing the following command: grep maxlogins /etc/security/limits.conf Verify the following line exists: hycu hard maxlogins 1 If the "maxlogins" value is not set to 1 or is missing, this is a finding.

✔️ Fix
The Web UI will only always allow one user session at a time. For CLI, configure the operating system to limit the max number of concurrent sessions to 1 by adding the following line to "/etc/security/limits.conf": hycu hard maxlogins 1