CVE-2024-38046
📋 TL;DR
This PowerShell vulnerability allows authenticated attackers to execute arbitrary code with elevated privileges on affected systems. It affects Windows systems with PowerShell installed, primarily impacting administrators and users with local access. The vulnerability stems from improper input validation (CWE-20) in PowerShell components.
💻 Affected Systems
- PowerShell
- Windows PowerShell
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h1 by Microsoft
Windows 10 21h1 by Microsoft
Windows 10 21h1 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM-level privileges, enabling lateral movement, data exfiltration, and persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install malware, or access restricted resources on compromised systems.
If Mitigated
Limited impact due to proper access controls, application whitelisting, and PowerShell execution restrictions preventing exploitation.
🎯 Exploit Status
Requires authenticated access and PowerShell execution capabilities. Exploitation likely involves crafted PowerShell commands or scripts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38046
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates via Windows Update. 2. For enterprise: Deploy patches through WSUS, SCCM, or Intune. 3. Verify PowerShell version after update. 4. Test critical applications after patching.
🔧 Temporary Workarounds
Enable PowerShell Constrained Language Mode
windowsRestricts PowerShell to safe language mode preventing many exploitation techniques
Set-PSSessionConfiguration -Name Microsoft.PowerShell -PSVersion 5.1 -LanguageMode ConstrainedLanguage
Implement Application Control
windowsUse Windows Defender Application Control or AppLocker to restrict PowerShell execution
🧯 If You Can't Patch
- Implement strict PowerShell execution policies and logging
- Restrict user permissions and implement least privilege access controls
🔍 How to Verify
Check if Vulnerable:
Check PowerShell version and compare against patched versions in Microsoft advisoryCheck Version:
$PSVersionTable.PSVersionVerify Fix Applied:
Verify PowerShell version matches patched version and test privilege escalation attempts fail📡 Detection & Monitoring
Log Indicators:
- PowerShell script block logging showing suspicious commands
- Event ID 4104 in Windows PowerShell logs with elevation attempts
- Unexpected PowerShell processes running with high privileges
Network Indicators:
- Unusual PowerShell remoting (WinRM) connections
- PowerShell downloads from suspicious sources
SIEM Query:
source="Windows PowerShell" AND (EventCode=4104 OR EventCode=4103) AND CommandLine="*elevate*" OR CommandLine="*bypass*"