Title

The audit system must be configured to audit successful file system mounts. (Cat III impact)

Discussion

The unauthorized exportation of data to external media could result in an information leak where classified information, Privacy Act information, and intellectual property could be lost. An audit trail should be created each time a filesystem is mounted to help identify and guard against information loss.

Check Content

To verify that auditing is configured for all media exportation events, run the following command: $ sudo grep -w "mount" /etc/audit/audit.rules -a always,exit -F arch=b32 -S mount -F auid>=500 -F auid!=4294967295 -k export -a always,exit -F arch=b32 -S mount -F auid=0 -k export -a always,exit -F arch=b64 -S mount -F auid>=500 -F auid!=4294967295 -k export -a always,exit -F arch=b64 -S mount -F auid=0 -k export If the system is 64-bit and does not return rules for both "b32" and "b64" architectures, this is a finding. If no line is returned, this is a finding.

Fix Text

At a minimum, the audit system should collect media exportation events for all users and root. Add the following to "/etc/audit/audit.rules": -a always,exit -F arch=b32 -S mount -F auid>=500 -F auid!=4294967295 -k export -a always,exit -F arch=b32 -S mount -F auid=0 -k export If the system is 64-bit, then also add the following: -a always,exit -F arch=b64 -S mount -F auid>=500 -F auid!=4294967295 -k export -a always,exit -F arch=b64 -S mount -F auid=0 -k export

Additional Identifiers

Rule ID: SV-217977r603264_rule

Vulnerability ID: V-217977

Group Title: SRG-OS-000064

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.