CVE-2025-24076
📋 TL;DR
This vulnerability in Windows Cross Device Service allows an authenticated attacker to escalate privileges on a local system. It affects Windows devices where the service is enabled, potentially allowing attackers to gain higher-level access than intended.
💻 Affected Systems
- Windows Cross Device Service
📦 What is this software?
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An attacker with initial access could gain SYSTEM privileges, potentially compromising the entire system and accessing sensitive data or installing persistent malware.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install software, or access restricted resources on compromised systems.
If Mitigated
With proper access controls and least privilege principles, impact is limited to the compromised user account's permissions.
🎯 Exploit Status
Requires authenticated access to the system. Exploitation involves manipulating the Cross Device Service's access controls.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft's monthly security updates for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24076
Restart Required: No
Instructions:
1. Apply the latest Windows security updates from Microsoft. 2. Ensure Windows Update is configured to automatically install security patches. 3. Verify the patch is applied by checking system updates.
🔧 Temporary Workarounds
Disable Cross Device Service
WindowsTemporarily disable the vulnerable service if not needed
sc stop cbdhsvc
sc config cbdhsvc start= disabled
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles for all user accounts
- Monitor for suspicious privilege escalation attempts and service manipulation
🔍 How to Verify
Check if Vulnerable:
Check if the Cross Device Service is running and if the system has unpatched Windows security updatesCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify the latest Windows security updates are installed and the system is no longer listed as vulnerable in Microsoft's advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected Cross Device Service activity
- Privilege escalation attempts
- Service manipulation events in Windows Event Logs
Network Indicators:
- Unusual local system calls or service communications
SIEM Query:
EventID=4688 AND ProcessName LIKE '%cbdhsvc%' OR EventID=4672 AND SubjectUserName NOT IN (expected_admin_users)