CVE-2022-36980
📋 TL;DR
This authentication bypass vulnerability in Ivanti Avalanche allows remote attackers to gain unauthorized access to the EnterpriseServer service. Attackers with existing authentication credentials can exploit a race condition in the authentication mechanism to bypass security checks. Organizations running vulnerable versions of Ivanti Avalanche are affected.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Avalanche management system, allowing attackers to deploy malicious configurations, access sensitive device management data, and potentially pivot to managed endpoints.
Likely Case
Unauthorized access to the management console, enabling attackers to view sensitive information, modify configurations, and potentially disrupt device management operations.
If Mitigated
Limited impact if network segmentation restricts access to the management interface and strong authentication controls are in place beyond the vulnerable service.
🎯 Exploit Status
Exploitation requires existing authentication credentials but leverages a race condition (CWE-367) to bypass subsequent authentication checks. The vulnerability was disclosed through ZDI-CAN-15528.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.3.4 and later
Vendor Advisory: https://download.wavelink.com/Files/avalanche_v6.3.4_release_notes.txt
Restart Required: Yes
Instructions:
1. Download Ivanti Avalanche version 6.3.4 or later from the official Ivanti portal. 2. Backup current configuration and database. 3. Run the installer to upgrade. 4. Restart the Avalanche services. 5. Verify the upgrade completed successfully.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to the Avalanche EnterpriseServer service to only trusted administrative networks
Firewall Rules
allImplement strict firewall rules to limit access to the vulnerable service ports
🧯 If You Can't Patch
- Implement network segmentation to isolate the Avalanche server from untrusted networks
- Enable detailed logging and monitoring for authentication attempts and implement alerting for suspicious access patterns
🔍 How to Verify
Check if Vulnerable:
Check the Avalanche version in the web interface under Help > About, or check the installed version in Windows Programs and FeaturesCheck Version:
Not applicable - check via web interface or Windows control panelVerify Fix Applied:
Verify the version is 6.3.4 or later and test authentication functionality📡 Detection & Monitoring
Log Indicators:
- Multiple rapid authentication attempts from same source
- Successful authentication without proper credential validation in logs
- Unusual access patterns to EnterpriseServer service
Network Indicators:
- Unusual traffic patterns to port 1777 (default Avalanche port)
- Authentication bypass attempts detected at network level
SIEM Query:
source="avalanche_logs" AND (event_type="authentication" AND result="success" AND user_agent="suspicious") OR (event_type="access" AND source_ip="untrusted_network")