Bypass 2021 — Kshared

The kshared bypass vulnerability typically involves manipulating the kernel's memory management or the kshared API to access or modify sensitive data. This can be achieved through various techniques, such as:

Normally, reading another process's physical memory requires: kshared bypass

Most bypass strategies involve "Premium Link Generators" (PLGs) or "Debrid" services. These platforms act as intermediaries, downloading the file using their own premium accounts and then serving it to you at full speed. includes examining similar structures in Linux ( vsyscall

includes examining similar structures in Linux ( vsyscall , VDSO ) for analogous bypasses, and developing generic static analysis rules to detect physical memory traversal patterns. However, it points to a KDDEBUGGER_DATA_BLOCK structure in

Specifically, the KUSER_SHARED_DATA structure contains a member called KdDebuggerDataBlock (in some Windows versions, part of the u union). On systems where kernel debugging is disabled, this pointer may still be present but unused. However, it points to a KDDEBUGGER_DATA_BLOCK structure in kernel memory, which contains MmPhysicalMemoryBlock , MmSystemRangeStart , and other low-level kernel data. By reading from that pointer, a process can obtain the base physical address of the kernel's system workspace.

| Tool Type | Evasion Effectiveness | |-----------|----------------------| | Userland Hooks (EDR) | – no userland API called. | | Syscall Monitoring (e.g., Sysmon Event ID 10) | Bypass – no syscall to NtReadVirtualMemory . | | Kernel Callbacks ( ObRegisterCallbacks ) | Partial bypass – physical reads don’t trigger object handle checks. | | PatchGuard (on x64) | Triggers if kernel code is modified, but read-only bypass is safe. |