CVE-2024-27976
📋 TL;DR
This path traversal vulnerability in Ivanti Avalanche's web component allows authenticated remote attackers to execute arbitrary commands with SYSTEM privileges. It affects Ivanti Avalanche versions before 6.4.3. Attackers can leverage this to gain complete control over affected systems.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with SYSTEM privileges, enabling data theft, ransomware deployment, lateral movement, and persistent backdoor installation.
Likely Case
Unauthorized command execution leading to data exfiltration, credential harvesting, and installation of malware or persistence mechanisms.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and monitoring that detects exploitation attempts.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained. Given the high impact and CVSS score, weaponization is likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.3
Vendor Advisory: https://forums.ivanti.com/s/article/Avalanche-6-4-3-Security-Hardening-and-CVEs-addressed?language=en_US
Restart Required: Yes
Instructions:
1. Download Ivanti Avalanche 6.4.3 from the official Ivanti portal. 2. Backup current configuration and data. 3. Run the installer to upgrade to version 6.4.3. 4. Restart the system as required by the installer.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to the Avalanche web interface to only trusted IP addresses using firewall rules.
Enhanced Authentication
allImplement multi-factor authentication (MFA) for all Avalanche user accounts to reduce risk of credential compromise.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Avalanche systems from critical assets.
- Enable detailed logging and monitoring for suspicious file path access attempts in web logs.
🔍 How to Verify
Check if Vulnerable:
Check the Avalanche version via the web interface (Help > About) or system properties. If version is below 6.4.3, the system is vulnerable.Check Version:
Check via web interface or examine installed programs in Windows Control Panel.Verify Fix Applied:
After patching, verify the version shows 6.4.3 or higher in the web interface or system properties.📡 Detection & Monitoring
Log Indicators:
- Unusual file path access patterns in web server logs (e.g., '../' sequences)
- Unexpected SYSTEM privilege command execution events
Network Indicators:
- Unusual outbound connections from Avalanche server to external IPs
- Suspicious HTTP requests containing path traversal patterns
SIEM Query:
source="avalanche_logs" AND (message="*../*" OR message="*SYSTEM*" AND event_type="command_execution")