CVE-2023-46216
📋 TL;DR
CVE-2023-46216 is a critical memory corruption vulnerability in the Mobile Device Server component of Ivanti Avalanche. Attackers can send specially crafted packets to trigger denial of service or potentially execute arbitrary code. 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
Remote code execution with SYSTEM/root privileges leading to complete system compromise and lateral movement within the network.
Likely Case
Denial of service causing Mobile Device Server crashes and disruption of mobile device management services.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
No authentication required, simple packet crafting needed. Likely to be weaponized quickly given high CVSS score and remote nature.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.2
Vendor Advisory: https://download.wavelink.com/Files/avalanche_v6.4.2_release_notes.txt
Restart Required: Yes
Instructions:
1. Download Ivanti Avalanche 6.4.2 from official sources. 2. Backup current configuration and database. 3. Run the installer to upgrade. 4. Restart the Avalanche service and verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Mobile Device Server ports (typically TCP 1777, 1778, 1779)
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" port protocol="tcp" port="1777-1779" accept'
netsh advfirewall firewall add rule name="Block Avalanche Ports" dir=in action=block protocol=TCP localport=1777-1779 remoteip=any
🧯 If You Can't Patch
- Implement strict network access controls to limit connections to Mobile Device Server only from trusted management networks
- Deploy intrusion detection/prevention systems to monitor for anomalous packet patterns targeting Avalanche ports
🔍 How to Verify
Check if Vulnerable:
Check Avalanche version in Administration Console > About. Versions below 6.4.2 are vulnerable.Check Version:
Check 'About' in Avalanche Administration Console GUI or examine installed programs in Windows Control PanelVerify Fix Applied:
Verify version shows 6.4.2 or higher in Administration Console and Mobile Device Server service is running normally.📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts to Mobile Device Server ports
- Avalanche service crash logs in Windows Event Viewer
- Unusual packet size or patterns in network logs
Network Indicators:
- Unusual traffic to TCP ports 1777-1779 from unexpected sources
- Malformed packets targeting Avalanche services
SIEM Query:
source="windows" AND (EventID=1000 OR EventID=1001) AND process_name="Avalanche*" OR dest_port IN (1777, 1778, 1779) AND packet_size>threshold