The audit system must be configured to audit failed attempts to access files and programs.

From SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Part of GEN002720-3

Associated with: CCI-000126

SV-45287r1_rule The audit system must be configured to audit failed attempts to access files and programs.

Vulnerability discussion

If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.

Check content

Verify auditd is configured to audit failed file access attempts. There must be an audit rule for each of the access syscalls logging all failed accesses (-F success=0) or there must both an "-F exit=-EPERM" and "-F exit=-EACCES" for each access syscall. Procedure: # cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S openat" | grep -e "-F success=0" # cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S openat" | grep -e "-F exit=-EPERM" # cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S openat" | grep -e "-F exit=-EACCES" If an "-S openat" audit rule with "-F success" does not exist and no separate rules containing "-F exit=-EPERM" and "-F exit=-EACCES" for "openat" exist, then this is a finding.

Fix text

Edit the audit.rules file and add the following line(s) to enable auditing of failed attempts to access files and programs: either: -a exit,always -F arch= -S openat -F success=0 or both: -a exit,always -F arch= -S openat -F exit=-EPERM -a exit,always -F arch= -S openat -F exit=-EACCES Restart the auditd service. # rcauditd restart OR # service auditd restart

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