CVE-2025-55677
📋 TL;DR
This vulnerability allows an authorized attacker to exploit an untrusted pointer dereference in the Windows Device Association Broker service to elevate privileges locally. It affects Windows systems where an attacker already has some level of access and can execute code. The impact is limited to local privilege escalation rather than remote code execution.
💻 Affected Systems
- Windows Device Association Broker service
📦 What is this software?
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An attacker with initial access (e.g., as a standard user) gains SYSTEM-level privileges, enabling complete control over the system, installation of malware, credential theft, and lateral movement.
Likely Case
An authenticated attacker elevates from a standard user to administrator or SYSTEM privileges to bypass security controls, install persistent backdoors, or access sensitive data.
If Mitigated
With proper controls like least privilege, application whitelisting, and network segmentation, impact is limited to the compromised host without lateral movement.
🎯 Exploit Status
Requires authenticated access and ability to execute code. CWE-822 indicates untrusted pointer dereference which typically requires specific conditions to trigger.
🛠️ 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-2025-55677
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates from Microsoft. 2. For enterprise environments, deploy updates via WSUS, SCCM, or Intune. 3. Restart affected systems to complete installation.
🔧 Temporary Workarounds
Disable Device Association Broker service
windowsDisables the vulnerable service to prevent exploitation
sc config DeviceAssociationBrokerSvc start= disabled
sc stop DeviceAssociationBrokerSvc
Restrict service permissions
windowsModify service permissions to limit who can interact with the service
sc sdset DeviceAssociationBrokerSvc D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)
🧯 If You Can't Patch
- Implement strict least privilege principles to limit initial access opportunities
- Deploy application control/whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for missing security updates or run: wmic qfe list | findstr KB[number from Microsoft advisory]Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify the security update is installed via Windows Update or run: systeminfo | findstr /B /C:"OS Name" /C:"OS Version" and compare to patched versions📡 Detection & Monitoring
Log Indicators:
- Unusual service crashes (Event ID 1000, 1001)
- Suspicious process creation from DeviceAssociationBrokerSvc context
- Privilege escalation attempts in security logs
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
EventID=4688 AND NewProcessName="*" AND ParentProcessName="*DeviceAssociationBroker*" OR EventID=1000 AND FaultingModuleName="*DeviceAssociation*"