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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-38566 RHEL-06-000197 SV-50367r3_rule Low
Description
Unsuccessful attempts to access files could be an indicator of malicious activity on a system. Auditing these events could serve as evidence of potential system compromise.
STIG Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-05-19

Details

Check Text ( C-46124r2_chk )
To verify that the audit system collects unauthorized file accesses, run the following commands:

# grep EACCES /etc/audit/audit.rules

-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid=0 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid=0 -k access

# grep EPERM /etc/audit/audit.rules

-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid=0 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid=0 -k access

If the system is 64-bit and does not return rules for both "b32" and "b64" architectures, this is a finding.

If either command lacks output, this is a finding.
Fix Text (F-43514r3_fix)
At a minimum, the audit system should collect unauthorized file accesses for all users and root. Add the following to "/etc/audit/audit.rules":

-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid=0 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid=0 -k access

If the system is 64-bit, then also add the following:

-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EACCES -F auid=0 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate \
-S ftruncate -F exit=-EPERM -F auid=0 -k access