Title

AIX must disable Kerberos Authentication in ssh config file to enforce access restrictions. (Cat II impact)

Discussion

Without auditing the enforcement of access restrictions against changes to the application configuration, it will be difficult to identify attempted attacks and an audit trail will not be available for forensic investigation for after-the-fact actions. Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact.

Check Content

Check the SSH daemon configuration for the Kerberos authentication setting: # grep -i KerberosAuthentication /etc/ssh/sshd_config | grep -v '^#' If the setting is present and set to "yes", this is a finding.

Fix Text

Edit the "/etc/ssh/sshd_config" file and add or change the "KerberosAuthentication" value of the setting to "no". Refresh sshd: # stopsrc -s sshd # startsrc -s sshd

Additional Identifiers

Rule ID: SV-215291r853473_rule

Vulnerability ID: V-215291

Group Title: SRG-OS-000365-GPOS-00152

Expert Comments

CCIs tied to check.

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