A local privilege escalation vulnerability can be found in OfficeScan when "Normal" security level is selected during product installation. This vulnerability could allow an attacker with limited privilege access on an affected system to escalate their privileges similar to that of a local administrator.
Background of the issue
By default, a "High" security level is selected during OfficeScan server installation. However, the installation allows the administrator to change this setting to "Normal" instead.
When OfficeScan is installed with "Normal" security level, it grants the user "Everyone" with a "Full Control" to the OfficeScan client program directory and files. It also allows OfficeScan client services to run under SYSTEM.
An attacker with unprivileged access to an affected system can overwrite any of these service executables with malicious executable content and run with the privileges of SYSTEM.
To remove this potential vulnerability, customers who changed the default "High" setting to "Normal" should change this setting back to "High".
- Install OfficeScan 11.0 Service Pack 1 Critical Patch 4150.
- Log in to the OfficeScan server console.
- Go to Agents > Agent Management.
- Select the Domain or Agent.
- Click Settings and go to Privileges and Other Settings.
- Click Other Settings tab and look for the OfficeScan Agent Security Settings section.
- From the Access Permissions options, choose High.
With a "High" Security Setting, the OfficeScan agent installation directory inherits the rights of the Program Files folder, and the OfficeScan agent’s registry entries inherit permissions from the HKLM\Software key. For most Active Directory configurations, this automatically limits the "normal" users (those without administrator privileges) to read-only access.
- If you have selected domain(s) or agent(s) in the agent tree, click Save. If you have clicked the root domain icon, choose from the following options:
- Apply to All Agents: Applies settings to all existing agents and to any new agent added to an existing/future domain - Future domains are domains not yet created at the time you configured the settings.
- Apply to Future Domains Only: Applies settings only to agents added to future domains - This option will not apply settings to new agents added to an existing domain.