Title

AIX must limit the number of concurrent sessions to 10 for all accounts and/or account types. (Cat II impact)

Discussion

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.

Check Content

From the command prompt, execute the following command to display maxulogs values for all the user account: # lsuser -a maxulogs ALL The above command should yield the following output: root maxulogs=10 user_1 maxulogs=10 If the above command shows any user account that does not have the "maxulogs" attribute set, or its value is "0", or its value greater than "10", this is a finding.

Fix Text

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]

Additional Identifiers

Rule ID: SV-215172r877399_rule

Vulnerability ID: V-215172

Group Title: SRG-OS-000027-GPOS-00008

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.