CVE-2023-32564
📋 TL;DR
This vulnerability allows attackers to upload malicious files to Avalanche systems, leading to remote code execution. It affects Ivanti Avalanche versions 6.4.1 and earlier. Attackers can potentially take full control of affected systems.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, steal data, deploy ransomware, or pivot to other network systems.
Likely Case
Attackers gain initial foothold on the system, install backdoors, and establish persistence for further malicious activities.
If Mitigated
Attack blocked at perimeter or detected early, limiting impact to isolated system with minimal data exposure.
🎯 Exploit Status
Unrestricted file upload vulnerabilities are commonly exploited and weaponized quickly.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.2 or later
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 6.4.2 or later from Ivanti portal. 2. Backup current configuration. 3. Install the update following Ivanti's upgrade documentation. 4. Restart the Avalanche service.
🔧 Temporary Workarounds
Restrict File Upload Types
allConfigure web application firewall or reverse proxy to block dangerous file types (.exe, .dll, .php, .jsp, etc.)
Network Segmentation
allIsolate Avalanche servers from internet and restrict internal access to authorized networks only.
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy application-level controls to validate and sanitize all file uploads
🔍 How to Verify
Check if Vulnerable:
Check Avalanche version in web interface or installation directory. Versions 6.4.1 or earlier are vulnerable.Check Version:
Check Avalanche web interface > Help > About or examine installation directory version files.Verify Fix Applied:
Verify version is 6.4.2 or later and test file upload functionality with restricted file types.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to Avalanche web interface
- Execution of unexpected processes from Avalanche directories
- Failed file upload attempts with dangerous extensions
Network Indicators:
- HTTP POST requests with file uploads to Avalanche endpoints
- Outbound connections from Avalanche server to unknown external IPs
SIEM Query:
source="avalanche.log" AND ("upload" OR "file") AND ("exe" OR "dll" OR "php" OR "jsp")