Exchange audit data must be protected against unauthorized access for modification.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-80507	EX16-ED-000120	SV-95217r1_rule		Medium

Description
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considered sensitive and in need of protection. Audit data available for modification by a malicious user can be altered to conceal malicious activity. Audit data might also provide a means for the malicious user to plan unauthorized activities that exploit weaknesses. The contents of audit logs are protected against unauthorized access, modification, or deletion. Only authorized auditors and the audit functions should be granted read and write access to audit log data.

Description

Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considered sensitive and in need of protection. Audit data available for modification by a malicious user can be altered to conceal malicious activity. Audit data might also provide a means for the malicious user to plan unauthorized activities that exploit weaknesses. The contents of audit logs are protected against unauthorized access, modification, or deletion. Only authorized auditors and the audit functions should be granted read and write access to audit log data.

STIG	Date
Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide	2019-03-12

Details

Check Text ( C-80239r1_chk )
Review the Email Domain Security Plan (EDSP). Determine the authorized groups or users that should have modify permissions to the audit data. If any group or user has modify permissions for the audit data that is not documented in the EDSP, this is a finding.

Fix Text (F-87359r1_fix)
Update the EDSP to reflect the authorized groups or users that should have modify permissions to the audit data. Restrict any unauthorized groups' or users' modify permissions for the audit logs.