CVE-2025-26628
📋 TL;DR
CVE-2025-26628 is an information disclosure vulnerability in Azure Local Cluster where credentials are insufficiently protected. An authorized attacker with local access can exploit this to access sensitive information. This affects users running vulnerable versions of Azure Local Cluster.
💻 Affected Systems
- Azure Local Cluster
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could obtain administrative credentials, potentially leading to full cluster compromise and lateral movement to other systems.
Likely Case
Authorized users with malicious intent could access credentials they shouldn't have, leading to unauthorized data access within the cluster.
If Mitigated
With proper access controls and monitoring, impact would be limited to credential exposure without successful exploitation.
🎯 Exploit Status
Exploitation requires local access and some level of authorization; complexity is low once access is obtained.
🛠️ 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-2025-26628
Restart Required: Yes
Instructions:
1. Check Microsoft Security Update Guide for CVE-2025-26628. 2. Apply the latest Azure Local Cluster updates from Microsoft. 3. Restart affected services/cluster nodes as required.
🔧 Temporary Workarounds
Restrict Local Access
allLimit local access to Azure Local Cluster to only necessary administrative users
# Use Azure RBAC or local OS permissions to restrict access
# Example: az role assignment create --assignee <user> --role 'Reader' --scope <cluster>
Enhanced Monitoring
windowsImplement strict monitoring of local access and credential usage
# Enable detailed auditing on cluster nodes
# Example for Windows: auditpol /set /subcategory:"Logon" /success:enable /failure:enable
🧯 If You Can't Patch
- Implement strict principle of least privilege for all local cluster access
- Deploy enhanced monitoring and alerting for suspicious local credential access patterns
🔍 How to Verify
Check if Vulnerable:
Check Azure Local Cluster version against Microsoft's patched versions list in the advisoryCheck Version:
# For Azure CLI: az --version | findstr "Local Cluster"
# Or check cluster management interface for version informationVerify Fix Applied:
Verify cluster is running patched version and test that credential protection mechanisms are functioning📡 Detection & Monitoring
Log Indicators:
- Unusual local access patterns to credential storage
- Multiple failed then successful credential access attempts from same local user
- Access to protected credential files by non-admin users
Network Indicators:
- N/A - This is a local vulnerability
SIEM Query:
source="*cluster*" AND (event_type="credential_access" OR file_path="*credential*" OR process_name="*credential*") AND user!="authorized_admin"