CVE-2021-45389
📋 TL;DR
This vulnerability allows attackers to bypass authentication in StarWind SAN/NAS and Command Center by injecting self-signed JWT tokens into the update manager. Successful exploitation enables privilege escalation, potentially giving attackers administrative control. This affects StarWind SAN and NAS build 1578 and StarWind Command Center build 6864.
💻 Affected Systems
- StarWind SAN and NAS
- StarWind Command Center
📦 What is this software?
San\&nas by Starwind
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative privileges, allowing data theft, system manipulation, and persistence establishment.
Likely Case
Unauthorized administrative access leading to configuration changes, data access, and potential lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially containing the breach to isolated systems.
🎯 Exploit Status
Authentication bypass vulnerability typically requires minimal technical skill to exploit once the method is understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest versions beyond affected builds
Vendor Advisory: https://www.starwindsoftware.com/security/sw-20211215-0001/
Restart Required: Yes
Instructions:
1. Download latest StarWind software from vendor portal. 2. Backup configurations. 3. Apply update following vendor documentation. 4. Restart services/systems as required.
🔧 Temporary Workarounds
Network Isolation
allRestrict network access to StarWind management interfaces to trusted IPs only
Configure firewall rules to allow only specific source IPs to StarWind management ports
Update Manager Access Control
allDisable or restrict access to update manager endpoints if not required
Configure application firewall or web server to block /update-manager paths
🧯 If You Can't Patch
- Implement strict network segmentation to isolate StarWind systems from untrusted networks
- Monitor for unusual authentication attempts and JWT token manipulation in logs
🔍 How to Verify
Check if Vulnerable:
Check StarWind software version in administration interface; vulnerable if running build 1578 (SAN/NAS) or 6864 (Command Center)Check Version:
Check via StarWind management interface or consult vendor documentation for CLI version checkVerify Fix Applied:
Verify version has been updated beyond affected builds and test authentication mechanisms📡 Detection & Monitoring
Log Indicators:
- Unusual JWT token generation/validation failures
- Authentication bypass attempts in update manager logs
- Privilege escalation events
Network Indicators:
- Unexpected requests to update manager endpoints
- JWT token manipulation attempts
SIEM Query:
source="starwind" AND (event_type="auth_failure" OR endpoint="/update-manager")