A Deep Dive into the GetProcessHandleFromHwnd API

The article analyzes the evolution of the GetProcessHandleFromHwnd API in Windows, revealing security flaws that allowed privilege escalation and access to protected processes. Early versions used user-mode hooks, but a shift to kernel-mode handling in Windows 10 introduced a vulnerability enabling unrestricted process handle access when UIPI checks were bypassed. This was exploited to compromise protected processes like WerFaultSecure.exe, leading to CVE-2023-41772. Recent Windows 11 updates have mitigated the issue by enforcing stricter access checks and feature flags.

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