CVE-2024-50321
📋 TL;DR
An infinite loop vulnerability in Ivanti Avalanche allows remote unauthenticated attackers to cause denial of service by crashing the service. This affects all Ivanti Avalanche installations before version 6.4.6. The vulnerability requires no authentication and can be triggered remotely.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Complete service outage of Ivanti Avalanche, disrupting mobile device management operations and potentially affecting all managed devices.
Likely Case
Service disruption requiring manual restart of Avalanche services, causing temporary loss of device management capabilities.
If Mitigated
Limited impact with proper network segmentation and monitoring allowing quick detection and response.
🎯 Exploit Status
The vulnerability requires no authentication and minimal technical skill to exploit for denial of service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.6
Vendor Advisory: https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-Avalanche-Multiple-CVEs-Q4-2024-Release
Restart Required: Yes
Instructions:
1. Download Ivanti Avalanche 6.4.6 from the Ivanti support portal. 2. Backup current configuration. 3. Run the installer to upgrade to version 6.4.6. 4. Restart the Avalanche service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Avalanche services to trusted IP addresses only
Load Balancer Protection
allConfigure load balancers or firewalls to limit connection rates to Avalanche services
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the Avalanche service
- Deploy monitoring and alerting for service restarts or abnormal traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check Avalanche version in the web interface under Help > About or via the Avalanche consoleCheck Version:
Not applicable - version check is through the Avalanche web interfaceVerify Fix Applied:
Confirm version shows 6.4.6 or higher in the Avalanche interface📡 Detection & Monitoring
Log Indicators:
- Avalanche service crashes or restarts
- High CPU usage followed by service termination
- Error logs indicating infinite loop conditions
Network Indicators:
- Unusual traffic patterns to Avalanche ports (typically 1777, 1778)
- Multiple connection attempts from single sources
SIEM Query:
source="avalanche" AND (event="service_crash" OR event="high_cpu" OR event="restart")