Details

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.

Solution

From the command prompt, execute the following command to set ‘maxulogs=10’ for the ‘default:’ stanza in the ‘/etc/security/user’ file:
# chsec -f /etc/security/user -s default -a maxulogs=10

For each user account whose ‘maxulogs’ value is greater than ’10’, or their ‘maxulogs’ value is not set, or the values are set to ‘0’, execute the following command to set ‘maxulogs=10’:
# chuser maxulogs=10 [user_name]

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_IBM_AIX_7-x_V2R3_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Unix.

References

• 800-53|AC-10
• CAT|II
• CCI|CCI-000054
• Rule-ID|SV-215172r508663_rule
• STIG-ID|AIX7-00-001004
• STIG-Legacy|SV-101327
• STIG-Legacy|V-91227
• Vuln-ID|V-215172

Source

• Tenable.com/audits