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For security professionals, maintaining an up-to-date system is the primary defense, as many publicized bypasses, such as CVE-2024-21305 , are patched shortly after discovery.
Modifying the PreviousMode bit in a thread structure to trick the kernel into thinking a user-mode request actually came from a trusted kernel-mode source. 2. Exploiting "Bring Your Own Vulnerable Driver" (BYOVD)
As traditional shellcode injection became obsolete, the focus of offensive security researchers and advanced threat actors shifted entirely toward finding an . Because HVCI makes executing new or unsigned code impossible, modern bypasses focus on manipulating existing code and system structures. Hvci Bypass
Security researchers have discovered multiple categories of techniques to bypass HVCI, each exploiting different weaknesses in the protection mechanism.
Where the standard Windows user-mode subsystem and kernel space ( ntoskrnl.exe , drivers) execute.
Understanding HVCI Bypasses: The Battle for Kernel Integrity This public link is valid for 7 days
3. Exploiting Page Table Manipulations (Pre-Hardware Mitigations)
Contains standard user-mode applications and the standard Windows kernel.
Virtualization-Based Security (VBS) creates an isolated memory region separate from the OS itself, acting as a digital "vault" for storing sensitive data such as security credentials. HVCI works closely with VBS, leveraging it as a base layer of trust. Together, they form Windows' virtualization-based security architecture that makes traditional hooking virtually impossible. Can’t copy the link right now
Since HVCI is highly effective at blocking traditional memory injection, researchers focus on manipulating memory management or exploiting underlying hardware/firmware vulnerabilities: PFN Swapping (Page Frame Number Swapping): This technique, demonstrated by tools like BusterCall
project demonstrates how published CVEs can be used together to bypass HVCI mitigations. Attacking SMM (System Management Mode):