Event Viewer must be protected from unauthorized modification and deletion.

From Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide

SV-72135r2_rule Event Viewer must be protected from unauthorized modification and deletion.

Vulnerability discussion

Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information.Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user enjoys in order to make access decisions regarding the modification or deletion of audit tools.

Check content

Verify the permissions on Event Viewer only allow TrustedInstaller permissions to change or modify. If any groups or accounts other than TrustedInstaller have Full control or Modify, this is a finding. Navigate to "%SystemRoot%\SYSTEM32". View the permissions on "Eventvwr.exe". The default permissions below satisfy this requirement. TrustedInstaller - Full Control Administrators, SYSTEM, Users, ALL APPLICATION PACKAGES - Read & Execute

Fix text

Ensure only TrustedInstaller has permissions to change or modify Event Viewer ("%SystemRoot%\SYSTEM32\Eventvwr.exe). The default permissions below satisfy this requirement. TrustedInstaller - Full Control Administrators, SYSTEM, Users, ALL APPLICATION PACKAGES - Read & Execute

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