The at.deny file must not be empty if it exists.

From AIX 5.3 Security Technical Implementation Guide

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-27381r1_rule The at.deny file must not be empty if it exists.

Vulnerability discussion

On some systems, if there is no at.allow file and there is an empty at.deny file, then the system assumes everyone has permission to use the at facility. This could create an insecure setting in the case of malicious users or system intruders.

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Add appropriate users to the at.deny file, or remove the empty at.deny file if an at.allow file exists.

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