CVE-2023-32562
📋 TL;DR
This vulnerability allows attackers to upload malicious files to Avalanche systems, leading to remote code execution. It affects all Avalanche versions 6.3.x and below. Attackers can compromise the entire system if successful.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the Avalanche server, potentially leading to lateral movement across the network.
Likely Case
Remote code execution allowing installation of malware, data theft, or ransomware deployment on the affected system.
If Mitigated
Limited impact with proper file upload restrictions and network segmentation in place.
🎯 Exploit Status
Unrestricted file upload vulnerabilities are typically easy to exploit. The CVSS 9.8 score indicates trivial exploitation with high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.1
Vendor Advisory: https://forums.ivanti.com/s/article/Avalanche-Vulnerabilities-Addressed-in-6-4-1?language=en_US
Restart Required: Yes
Instructions:
1. Download Avalanche 6.4.1 from Ivanti portal. 2. Backup current configuration. 3. Run installer to upgrade. 4. Restart Avalanche services. 5. Verify version in web interface.
🔧 Temporary Workarounds
File Upload Restriction
allImplement strict file type validation and upload restrictions at web application firewall or reverse proxy level.
Network Segmentation
allIsolate Avalanche server from internet and restrict internal access to authorized users only.
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the Avalanche web interface.
- Deploy web application firewall with file upload protection rules and monitor for suspicious upload attempts.
🔍 How to Verify
Check if Vulnerable:
Check Avalanche version in web interface under Help > About. If version is 6.3.x or below, system is vulnerable.Check Version:
Check web interface at https://[avalanche-server]/avalanche/ or view installed programs in Windows Control Panel.Verify Fix Applied:
Verify version shows 6.4.1 or higher in web interface. Test file upload functionality with restricted file types.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to Avalanche web interface
- Execution of unexpected processes by Avalanche service
- Web server logs showing file upload attempts with executable extensions
Network Indicators:
- HTTP POST requests to upload endpoints with executable file types
- Outbound connections from Avalanche server to suspicious IPs
SIEM Query:
source="avalanche" AND (url="*upload*" OR method="POST") AND (file_extension="exe" OR file_extension="php" OR file_extension="jsp" OR file_extension="asp")