A Deep Dive into the GetProcessHandleFromHwnd API
Summary
Google Project Zero researchers analyzed the GetProcessHandleFromHwnd API, noting its potential for exploitation in UAC bypass scenarios. The API allows a caller with UIAccess to obtain a process handle, which can be abused if the caller and target process run as the same user.
IFF Assessment
FOE
The API functionality can be abused for privilege escalation and other malicious purposes.
Defender Context
Defenders should be aware of the potential for misuse of the GetProcessHandleFromHwnd API, especially in environments where UIAccess is enabled. Monitoring for unexpected use of this API and code injection attempts can help mitigate risks. This highlights the ongoing challenges in securing Windows APIs against abuse.