V-29238

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 truncate" | grep -e "-F success=0"
# cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S truncate" | grep -e "-F exit=-EPERM"
# cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S truncate" | grep -e "-F exit=-EACCES"
If an "-S truncate" audit rule with "-F success" does not exist and no separate rules containing "-F exit=-EPERM" and "-F exit=-EACCES" for "truncate" exist, then this is a finding.