Title

AIX must automatically remove or disable temporary user accounts after 72 hours or sooner. (Cat II impact)

Discussion

If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be used to gain unauthorized access. To mitigate this risk, automated termination of all temporary accounts must be set upon account creation. Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation. If temporary accounts are used, the operating system must be configured to automatically terminate these types of accounts after a DoD-defined time period of 72 hours. To address access requirements, many operating systems may be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.

Check Content

From the command prompt, execute the following command: # lsuser -a expires tmp_user The above command should yield the following output: tmp_user expires=0 Or tmp_user expires=1215103116 The "expires" value is in "MMDDhhmmyy" form, or the value is "0". If "expires" value is "0", or the expiration time is greater than "72" hours from the user creation time, this is a finding.

Fix Text

From the command prompt, execute the following command to set the expiration time to 72 hours from now: # chuser expires=1218103116 tmp_user From the command prompt, execute the following command: # lsuser -a expires tmp_user The above command should yield the following output: tmp_user expires=1218103116

Additional Identifiers

Rule ID: SV-215170r958364_rule

Vulnerability ID: V-215170

Group Title: SRG-OS-000002-GPOS-00002

Expert Comments

CCIs tied to check.

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