Published Paper Details:

Intranet access has become an essential function for corporate users. At the same time, a corporation's security administrators have little ability to control access to corporate data once it is released to remote clients. At present, no confidentiality or integrity guarantees about the remote access clients are made, so an attacker may have compromised a client process and is now downloading or modifying corporate data. Even though we have corporate-wide access control over remote users, the access control approach is currently insufficient to stop these malicious processes. We have designed and implemented the Session Security VPN network infrastructure that empowers corporations to verify client integrity properties and establish trust upon the client policy enforcement before allowing clients (remote) access to corporate Intranet services. Client integrity is measured using Routing and Remote Access Services (RRAS), a new security technology that is becoming broadly available on client systems, and our system uses these measurements for access policy decisions enforced upon the client's processes. We have implemented Microsoft Operating System along with Domain/Client prototype system that utilizes the RRAS measurement and attestation, existing network control, and existing corporate policy management tools. This prototype illustrates that our solution integrates seamlessly into scalable corporate policy management and introduces only a minor performance overhead.