The IDPS must protect application audit and sensor event logs are protected from unauthorized deletion.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-NET-000100-IDPS-000109	SRG-NET-000100-IDPS-000109	SRG-NET-000100-IDPS-000109_rule		Medium

Description
Logging the actions of specific events provides a means to investigate an attack, recognize resource utilization or capacity thresholds, or to simply identify an improperly configured system. Audit and event log data must be protected from unauthorized access, including from legitimate administrators who are not do not have a need for this type of access. Unauthorized deletion of logs or events may obfuscate evidence of an attack. Event log and sensor log entries should not be deleted without a clear audit trail and an approval process. There are two types of log files required for IDPS components, the sensor event log/queue and the application audit trail log. The sensor event log stores detected events based on sensor network scans. The application level audit trail log stores auditing results of enforcement actions based on the access control restrictions and other security policy for the IDPS itself.

Description

Logging the actions of specific events provides a means to investigate an attack, recognize resource utilization or capacity thresholds, or to simply identify an improperly configured system. Audit and event log data must be protected from unauthorized access, including from legitimate administrators who are not do not have a need for this type of access. Unauthorized deletion of logs or events may obfuscate evidence of an attack. Event log and sensor log entries should not be deleted without a clear audit trail and an approval process. There are two types of log files required for IDPS components, the sensor event log/queue and the application audit trail log. The sensor event log stores detected events based on sensor network scans. The application level audit trail log stores auditing results of enforcement actions based on the access control restrictions and other security policy for the IDPS itself.

STIG	Date
IDPS Security Requirements Guide (SRG)	2012-03-08

Details

Check Text ( C-43240_chk )
Verify a security policy for the audit logs is in place which allows only system administrators with the proper authorization to delete the audit log on the sensors and management console. Verify a security policy for the sensor event logs is in place which allows only system administrators with the proper authorization to delete the sensor log on the sensors and management console. If audit logs are not protected from unauthorized deletion this is a finding. If event logs are not protected from unauthorized deletion, this is a finding.

Check Text ( C-43240_chk )

Verify a security policy for the audit logs is in place which allows only system administrators with the proper authorization to delete the audit log on the sensors and management console.
Verify a security policy for the sensor event logs is in place which allows only system administrators with the proper authorization to delete the sensor log on the sensors and management console.

If audit logs are not protected from unauthorized deletion this is a finding. If event logs are not protected from unauthorized deletion, this is a finding.

Fix Text (F-43240_fix)
Create and implement an access control security policy to prevent unauthorized deletion of the audit logs on the management console and sensors. Create and implement an access control security policy to prevent unauthorized deletion of the sensor event logs on the management console and sensors.