CVE-2025-26627
📋 TL;DR
This command injection vulnerability in Azure Arc allows authenticated attackers to execute arbitrary commands on affected systems, potentially leading to local privilege escalation. Organizations using vulnerable Azure Arc configurations are affected.
💻 Affected Systems
- Azure Arc
📦 What is this software?
Azure Arc by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative privileges, data exfiltration, and lateral movement across the network.
Likely Case
Local privilege escalation allowing attackers to gain higher permissions on the compromised system.
If Mitigated
Limited impact due to network segmentation and proper access controls restricting command execution.
🎯 Exploit Status
Requires authenticated access and knowledge of command injection techniques
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patched versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26627
Restart Required: No
Instructions:
1. Review Microsoft Security Update Guide for CVE-2025-26627. 2. Apply the latest Azure Arc updates. 3. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Azure Arc Management Access
allLimit access to Azure Arc management interfaces to only authorized administrators
Implement Network Segmentation
allIsolate Azure Arc management interfaces from general network access
🧯 If You Can't Patch
- Implement strict access controls and monitoring for Azure Arc management interfaces
- Deploy application control solutions to restrict command execution capabilities
🔍 How to Verify
Check if Vulnerable:
Check Azure Arc version against Microsoft's patched versions listCheck Version:
az arcdata dc config show (for Azure Arc-enabled data services) or check Azure portal for version informationVerify Fix Applied:
Verify Azure Arc is updated to patched version and test management interface functionality📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in Azure Arc logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from Azure Arc management systems
- Suspicious command strings in network traffic
SIEM Query:
source="azure-arc" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*)")