A Deep Dive into the GetProcessHandleFromHwnd API
In my previous blog post I mentioned the GetProcessHandleFromHwnd API. This was an API I didn’t know existed until I found a publicly disclosed UAC bypass using the Quick Assist UI Access application. This API looked interesting so I thought I should take a closer look. I typically start by reading the documentation for an API I don’t know about, assuming it’s documented at all. It can give you an idea of how long the API has existed as well as its security properties. The documentation’s remark
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.