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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-29236	GEN002720-2	SV-37612r2_rule	ECAR-1 ECAR-2 ECAR-3	Medium

Description
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.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2015-03-12

Details

Check Text ( C-36810r2_chk )
Check that auditd is configured to audit failed file access attempts. There must be an audit rule for each of the access syscalls that logs 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 open" \| grep -e "-F success=0" # cat /etc/audit/audit.rules \| grep -e "-a exit,always" \| grep -e "-S open" \| grep -e "-F exit=-EPERM" # cat /etc/audit/audit.rules \| grep -e "-a exit,always" \| grep -e "-S open" \| grep -e "-F exit=-EACCES" If an "-S open" audit rule with "-F success" does not exist and no separate rules containing "-F exit=-EPERM" and "-F exit=-EACCES" for "open" exist, then this is a finding.

Check Text ( C-36810r2_chk )

Check that auditd is configured to audit failed file access attempts.
There must be an audit rule for each of the access syscalls that logs 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 open" | grep -e "-F success=0"
# cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S open" | grep -e "-F exit=-EPERM"
# cat /etc/audit/audit.rules | grep -e "-a exit,always" | grep -e "-S open" | grep -e "-F exit=-EACCES"

If an "-S open" audit rule with "-F success" does not exist and no separate rules containing "-F exit=-EPERM" and "-F exit=-EACCES" for "open" exist, then this is a finding.

Fix Text (F-31649r1_fix)
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 open -F success=0 or both: -a exit,always -F arch= -S open -F exit=-EPERM -a exit,always -F arch= -S open -F exit=-EACCES Restart the auditd service. # service auditd restart