Direct logins must not be permitted to shared, default, application, or utility accounts.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Part of GEN000280

Associated with IA controls: IAIA-1

Associated with: CCI-000770

SV-38668r1_rule Direct logins must not be permitted to shared, default, application, or utility accounts.

Vulnerability discussion

Shared accounts (accounts where two or more people log in with the same user identification) do not provide identification and authentication. There is no way to provide for non-repudiation or individual accountability.

Check content

Use the last command to check for multiple accesses to an account from different workstations/IP addresses. If users log directly onto accounts, rather than using the su command from their own named account to access them, this is a finding (such as logging directly on to Oracle). Also, ask the SA or the IAO if shared accounts are logged into directly or if users log on to an individual account and switch user to the shared account. # last Shared or Application accounts can have direct login disabled by setting the rlogin parameter to false in the users stanza of the /etc/security/user file. #lsuser -a rlogin < user_id > If users log directly on to shared accounts, this is a finding.

Fix text

Use the switch user (su) command from a named account login to access shared accounts. Maintain audit trails to identify the actual user of that account name. Document requirements and procedures for users/administrators to log into their own accounts first and then switch user (su) to the account that must be shared. Direct login to shared or application accounts can be prevented by setting the rlogin = false in the accounts stanza of the /etc/security/user file. Additional hardening of the shared/application accounts can be done with the sugroups = in the accounts stanza of the /etc/security/user file. #chuser rlogin=false < user id >

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