CVE-2022-36981
📋 TL;DR
This is a critical path traversal vulnerability in Ivanti Avalanche that allows authenticated attackers to bypass authentication mechanisms and execute arbitrary code with service account privileges. It affects Ivanti Avalanche 6.3.3.101 installations where attackers can manipulate file paths to achieve remote code execution.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining service account privileges, enabling lateral movement, data exfiltration, and persistent backdoor installation.
Likely Case
Unauthorized code execution leading to data theft, system manipulation, and potential ransomware deployment within the affected network segment.
If Mitigated
Limited impact with proper network segmentation and authentication controls, potentially only affecting the Avalanche service itself.
🎯 Exploit Status
ZDI-CAN-15966 was assigned. Authentication bypass makes exploitation easier despite requiring initial authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.3.4
Vendor Advisory: https://download.wavelink.com/Files/avalanche_v6.3.4_release_notes.txt
Restart Required: Yes
Instructions:
1. Download Ivanti Avalanche 6.3.4 from official sources. 2. Backup current configuration and data. 3. Run the installer to upgrade from 6.3.3.101 to 6.3.4. 4. Restart the Avalanche service and verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Avalanche server to only trusted management networks
Authentication Hardening
allImplement multi-factor authentication and strong password policies for all Avalanche accounts
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted IP addresses only
- Monitor for suspicious authentication attempts and file path manipulation in logs
🔍 How to Verify
Check if Vulnerable:
Check Avalanche version in administration console or via 'About' menu. If version is 6.3.3.101, system is vulnerable.Check Version:
Check via Avalanche web interface: Administration > About, or examine installed programs in Windows Control PanelVerify Fix Applied:
Verify version shows 6.3.4 or higher in administration console and test that DeviceLogResource functionality works without errors.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Suspicious file path requests to DeviceLogResource endpoints
- Unexpected process execution from Avalanche service account
Network Indicators:
- Unusual outbound connections from Avalanche server
- Traffic to DeviceLogResource API with path traversal patterns
SIEM Query:
source="avalanche" AND (event_type="authentication" AND result="success" FROM unusual_ip) OR (uri="*DeviceLogResource*" AND path="*../*")