Merge 47cf3bde11 into 9bc2a0312d
Aleff
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# Defend yourself against CVE-2023-36884 Office and Windows HTML Remote Code Execution Vulnerability
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This script allows you to set the Register Key block rule that will allow you to defend against CVE-2023-36884.
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**Category**: Incident Response
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## Table of Contents
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- [Payload Description](#payload-description)
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- [CVE-2023-36884 Description](#cve-2023-36884-description)
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- [Summary](#summary)
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- [Note](#note)
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- [Dependencies](#dependencies)
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- [Settings](#settings)
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- [Administrative Privileges](#administrative-privileges)
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- [Set the rule](#set-the-rule)
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- [See the new rule](#see-the-new-rule)
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- [Remove the rule](#remove-the-rule)
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- [Credits](#credits)
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## Payload Description
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This script allows you to set the Register Key block rule that will allow you to defend against CVE-2023-36884.
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Open a PowerShell, set the Register Key block rule trough the [command line interface](https://learn.microsoft.com/en-us/powershell/scripting/samples/working-with-registry-keys?view=powershell-7.3).
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## CVE-2023-36884 Description
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### Summary
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Microsoft is investigating reports of a series of remote code execution vulnerabilities impacting Windows and Office products. Microsoft is aware of targeted attacks that attempt to exploit these vulnerabilities by using specially-crafted Microsoft Office documents.
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An attacker could create a specially crafted Microsoft Office document that enables them to perform remote code execution in the context of the victim. However, an attacker would have to convince the victim to open the malicious file.
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Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This might include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs.
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Please see the Microsoft Threat Intelligence [Blog Entry](https://www.microsoft.com/en-us/security/blog/2023/07/11/storm-0978-attacks-reveal-financial-and-espionage-motives/) for important information about steps you can take to protect your system from this vulnerability.
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This CVE will be updated with new information and links to security updates when they become available. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this CVE. See [Microsoft Technical Security Notifications](https://www.microsoft.com/en-us/msrc/technical-security-notifications?rtc=1) and [Security Update Guide Notification System News: Create your profile now – Microsoft Security Response Center](https://msrc.microsoft.com/blog/2022/08/security-update-guide-notification-system-news-create-your-profile-now/).
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Source: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36884
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### Note
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Tested on:
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- Windows 11 Eng
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### Dependencies
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* ExecutionPolicy Bypass
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## Settings
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In this payload, I created a new registry key called "FEATURE_BLOCK_CROSS_PROTOCOL_FILE_NAVIGATION." All of the following application names are then added as a value of type REG_DWORD with data 1.
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- Excel.exe
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- Graph.exe
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- MSAccess.exe
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- MSPub.exe
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- Powerpnt.exe
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- Visio.exe
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- WinProj.exe
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- WinWord.exe
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- Wordpad.exe
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Remember that you must run PowerShell with administrative privileges to create and manage registry keys.
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### Administrative Privileges
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- I used the Payload [Starting a PowerShell with administrator permissions in Windows 10/11](https://github.com/hak5/usbrubberducky-payloads/tree/master/payloads/library/execution/Starting_a_PowerShell_with_administrator_permissions_in_Windows) by Hak5 Payloads
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```
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DELAY 1000
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GUI x
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DELAY 500
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STRING a
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DELAY 500
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LEFT_ARROW
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DELAY 500
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ENTER
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```
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### Set the rule
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### See the new rule
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### Remove the rule
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## Credits
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<h2 align="center">Aleff</h2>
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<div align=center>
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<table>
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<tr>
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<td align="center" width="96">
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<a href="https://github.com/aleff-github">
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<img src=https://github.com/aleff-github/aleff-github/blob/main/img/github.png?raw=true width="48" height="48" />
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</a>
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<br>Github
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</td>
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<td align="center" width="96">
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<a href="https://www.linkedin.com/in/alessandro-greco-aka-aleff/">
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<img src=https://github.com/aleff-github/aleff-github/blob/main/img/linkedin.png?raw=true width="48" height="48" />
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</a>
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<br>Linkedin
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</td>
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</tr>
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</table>
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</div>
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@ -0,0 +1,106 @@
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#######################################################################################################################
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# #
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# Title : Defend yourself against CVE-2023-36884 Office and Windows HTML Remote Code Execution Vulnerability #
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# Author : Aleff #
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# Version : 1.0 #
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# Category : Incident Response #
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# Target : Windows 10/11 #
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# #
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#######################################################################################################################
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ATTACKMODE HID
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# PlugAndPlay <3
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# Requirements:
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# - ExecutionPolicy Bypass
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# Impact: Remote Code Execution
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# Max Severity: Important
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# Mitigation:
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# - Customers who use Microsoft Defender for Office are protected from attachments that attempt to exploit this vulnerability.
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# - The registry key FEATURE_BLOCK_CROSS_PROTOCOL_FILE_NAVIGATION is located in the Main folder under the Internet Explorer settings, within the path HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\FeatureControl. This registry key is used to mitigate the vulnerability known as 'Office and Windows HTML Remote Code Execution Vulnerability' (CVE-2023-36884).
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# The CVE-2023-36884 vulnerability allows remote code execution through the processing of HTML files by Office and Windows applications. Creating this registry key and adding specific application values, such as REG_DWORD with data 1, helps block cross-protocol file navigation to mitigate the exploitation of this vulnerability.
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# It is recommended to implement these protective measures to prevent potential attacks that could exploit the vulnerability and compromise the security of Office and Windows systems. It is important to understand the implications of modifying the registry and carefully evaluate the impact on the regular functionality of the involved applications.
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# Source: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36884
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QUACK DELAY 1000
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QUACK GUI x
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QUACK DELAY 500
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QUACK STRING a
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QUACK DELAY 500
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QUACK LEFTARROW
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QUACK DELAY 500
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QUACK ENTER
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QUACK DELAY 500
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# Sets the path to the registry key
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QUACK STRING \$registryPath = 'HKLM:\SOFTWARE\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BLOCK_CROSS_PROTOCOL_FILE_NAVIGATION'
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QUACK ENTER
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QUACK DELAY 500
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# Array of application names
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QUACK STRING \$applicationNames = @(
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'Excel.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'Graph.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'MSAccess.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'MSPub.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'Powerpnt.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'Visio.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'WinProj.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'WinWord.exe',
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING 'Wordpad.exe'
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING )
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QUACK ENTER
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QUACK DELAY 500
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# Create the registry key if it does not already exist
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QUACK STRING if (!(Test-Path \$registryPath)) {
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING New-Item -Path \$registryPath -Force # Out-Null
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING echo 'Registry key created'
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING }
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QUACK ENTER
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QUACK DELAY 500
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# Add the values to the registry key
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QUACK STRING foreach (\$appName in \$applicationNames) {
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING Set-ItemProperty -Path \$registryPath -Name \$appName -Value 1 -Type DWORD -Force # Out-Null
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING echo '[+] \$appName'
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QUACK ENTER
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QUACK DELAY 500
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QUACK STRING }
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QUACK ENTER
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QUACK DELAY 500
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Loading…
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