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Windows Communication Foundation (WCF) is a framework for building service-oriented applications. Using WCF, you can send data as asynchronous messages from one service endpoint to another. A service endpoint can be part of a continuously available service hosted by IIS, or it can be a service hosted in an application. (
In 2018, there have been quite a few local privilege escalation and remote code execution CVEs related to abusing the functionality exposed by WCF services in .NET programs. These were found in products such as VPN clients, commercial network monitoring tools, and antivirus software. In some cases, these services accidentally exposed stronger capabilities than intended (for example, the ability to run arbitrary code). In other cases, sensitive features have been locked down, but the security mechanisms are faulty and can be bypassed.
The aim of this presentation is to spread awareness of WCF as an attack surface, and to demonstrate how to get started finding and exploiting these bugs. This will be accomplished by reviewing the vulnerability identification and exploit development process for a recent 0-day privilege escalation in Check Point's flagship antivirus product ZoneAlarm.