The at.allow file must be group-owned by system, bin, sys, or cron.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Part of GEN003470

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-39354r1_rule The at.allow file must be group-owned by system, bin, sys, or cron.

Vulnerability discussion

If the group-owner of the at.allow file is not set to system, bin, sys, or cron, unauthorized users could be allowed to view or edit the list of users permitted to run at jobs. Unauthorized modification could result in Denial of Service to authorized at users or provide unauthorized users with the ability to run at jobs.

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Change the group owner of the at.allow file to sys, system, bin, or cron. Procedure: # chgrp cron /var/adm/cron/at.allow

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