The Ubuntu operating system must limit the number of concurrent sessions to ten for all accounts and/or account types.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-238323 | UBTU-20-010400 | SV-238323r1101671_rule | Low |
| Description |
| The Ubuntu operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to DoS attacks. This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system. |
| STIG | Date |
| Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide | 2025-05-16 |
Details
| Check Text (C-41533r1101669_chk) |
| Verify the Ubuntu operating system limits the number of concurrent sessions to 10 for all accounts and/or account types by running the following command: $ grep maxlogins /etc/security/limits.conf /etc/security/limits.d/*.conf | grep -v '^#' * hard maxlogins 10 If the "maxlogins" item is missing, or the value is not set to 10 or less, or is commented out, this is a finding. |
| Fix Text (F-41492r1101670_fix) |
| Configure the Ubuntu operating system to limit the number of concurrent sessions to 10 for all accounts and/or account types. Add the following line to the top of the "/etc/security/limits.conf" file or to a file in "/etc/security/limits.d/": * hard maxlogins 10 |