CVE-2025-47989
📋 TL;DR
This vulnerability in Azure Connected Machine Agent allows an authenticated attacker with local access to a machine to escalate privileges, potentially gaining administrative control. It affects systems running the vulnerable agent version. Organizations using Azure Arc-enabled servers are primarily impacted.
💻 Affected Systems
- Azure Connected Machine Agent
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full administrative control over the machine, enabling lateral movement, data theft, and persistence establishment.
Likely Case
An authenticated user elevates privileges to install malware, access sensitive data, or modify system configurations.
If Mitigated
With proper access controls and monitoring, impact is limited to isolated systems with minimal data exposure.
🎯 Exploit Status
Exploitation requires authenticated local access. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.45.0 or later
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47989
Restart Required: Yes
Instructions:
1. Update Azure Connected Machine Agent to version 1.45.0 or later. 2. On Windows: Use Azure Arc agent update mechanism or download from Microsoft Update. 3. On Linux: Use package manager or Azure Arc update script. 4. Restart the machine after update.
🔧 Temporary Workarounds
Restrict Local Access
allLimit local user access to machines running the vulnerable agent.
Monitor Privilege Escalation Attempts
windowsEnable auditing for privilege escalation events and service modifications.
auditpol /set /subcategory:"Privilege Use" /success:enable /failure:enable
🧯 If You Can't Patch
- Implement strict least-privilege access controls for local users.
- Monitor for unusual process creation or privilege escalation patterns.
🔍 How to Verify
Check if Vulnerable:
Check Azure Connected Machine Agent version. On Windows: Check 'AzureConnectedMachineAgent' service version. On Linux: Check package version or run 'azcmagent version'.Check Version:
Windows: Get-WmiObject Win32_Service -Filter "Name='AzureConnectedMachineAgent'" | Select-Object Name, PathName. Linux: azcmagent versionVerify Fix Applied:
Confirm agent version is 1.45.0 or later. Verify no unauthorized privilege escalation attempts in logs.📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Azure Connected Machine Agent service modifications
- Unauthorized process execution with elevated privileges
Network Indicators:
- Unusual outbound connections from Azure Arc-managed machines
SIEM Query:
EventID=4688 AND NewProcessName LIKE '%azcmagent%' AND SubjectUserName NOT IN (authorized_users)