Windows Win32 Kernel Subsystem# CVE-2025-49667 — Win32k Privilege Escalation Exploit
✔ Tested: Windows 10
✘ Not Working: Windows 11
---
## 🧭 Table of Contents
1. [Vulnerability Details](#vulnerability-details)
2. [Affected Systems](#affected-systems)
3. [Exploit Workflow](#exploit-workflow)
4. [Compilation Instructions](#compilation-instructions)
5. [Exploit Output Example](#exploit-output-example)
6. [Exploit Flow Diagram](#exploit-flow-diagram)
7. [Notes](#notes)
8. [Disclaimer](#disclaimer)
---
## 🔥 Vulnerability Details
- **CVE ID**: [CVE-2025-49667](https://nvd.nist.gov/vuln/detail/CVE-2025-49667) | [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-49667)
- **Type**: Double Free (CWE-415)
- **Component**: Windows Win32 Kernel Subsystem (win32k.sys)
- **Impact**: Local Privilege Escalation (LPE → SYSTEM)
- **CVSS Score**: 7.8 (High)
- **Attack Vector**: Local, low-complexity exploit
---
## 💻 Affected Systems
- ✔ Windows 10 (1909 → 22H2)
- ✘ Windows 11 (patched by default)
- ✘ Windows Server (partially mitigated)
---
## ⚡ Exploit Workflow
1. Trigger vulnerable syscall in `win32k.sys`.
2. Force a **double free** on kernel memory object.
3. Reallocate freed memory with controlled data.
4. Overwrite kernel function pointer.
5. Escalate to **NT AUTHORITY\SYSTEM**.
---
## 🛠 Compilation Instructions
```
x86_64-w64-mingw32-gcc exploit.c -o exploit.exe -masm=intel
```
Run with:
```
exploit.exe
```
## 📟 Exploit Output Example
```
C:\Users\yuri08> whoami
yuri08
C:\Users\yuri08> exploit.exe
[*] Triggering double free...
[*] Overwriting function pointer...
[*] Gaining SYSTEM privileges...
[+] Exploit successful!
C:\Windows\system32> whoami
nt authority\system
```
## 📜Exploit Flow Diagram
```
+-----------------------+
| Userland Process |
+----------+------------+
|
v
+-----------------------+
| Call vulnerable API |
| (win32k.sys) |
+----------+------------+
|
Double Free Trigger
|
v
+-----------------------+
| Kernel Object Freed |
+----------+------------+
|
Fake Object Spray
|
v
+-----------------------+
| Overwrite Func Ptr |
+----------+------------+
|
SYSTEM Privileges
|
v
+-----------------------+
| NT AUTHORITY\SYSTEM |
+-----------------------+
```
## 📝 Notes
- Requires local access (no remote vector).
- Works reliably on Windows 10 pre-patch.
- May cause BSOD if heap spray fails.
- Debug with WinDbg: !analyze -v
## ⚠ Disclaimer
- This exploit code and documentation are provided strictly for educational and research purposes only.
- Do not use on systems without explicit authorization.
- You are fully responsible for your actions.
>🕶 Stay safe, hack the planet responsibly.
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