CVE-2024-6863
📋 TL;DR
This vulnerability in h2oai/h2o-3 version 3.46.0 exposes an endpoint that allows attackers to encrypt arbitrary files on the server with custom keys, which can then be overwritten, creating ransomware-like conditions. This affects organizations using the vulnerable version of h2o-3 machine learning platform. Attackers can render files inaccessible by encrypting them with unknown keys.
💻 Affected Systems
- h2oai/h2o-3
📦 What is this software?
H2o by H2o
⚠️ Risk & Real-World Impact
Worst Case
Critical system files are encrypted with unknown keys, causing complete system unavailability and requiring restoration from backups or complete system rebuild.
Likely Case
Data files, configuration files, or application files are encrypted, disrupting operations and requiring file restoration from backups.
If Mitigated
Limited impact to non-critical files if proper access controls and monitoring are in place.
🎯 Exploit Status
The vulnerability is publicly documented with technical details, making exploitation straightforward for attackers with access to the endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.46.0.1 or later
Vendor Advisory: https://github.com/h2oai/h2o-3/security/advisories
Restart Required: Yes
Instructions:
1. Stop the h2o-3 service. 2. Update to version 3.46.0.1 or later using package manager or manual installation. 3. Restart the h2o-3 service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable or restrict access to EncryptionTool endpoint
allConfigure firewall rules or application settings to block access to the vulnerable endpoint.
# Example firewall rule for Linux: iptables -A INPUT -p tcp --dport [h2o-port] -m string --string "EncryptionTool" --algo bm -j DROP
Network segmentation and access controls
allRestrict network access to h2o-3 service to only trusted IP addresses or networks.
# Example: iptables -A INPUT -p tcp --dport [h2o-port] -s [trusted-ip-range] -j ACCEPT
# iptables -A INPUT -p tcp --dport [h2o-port] -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the h2o-3 service
- Monitor file system changes and encryption activity for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Check if h2o-3 version is exactly 3.46.0 by examining the service version or package information.Check Version:
h2o --version or check the h2o-3 package version via system package managerVerify Fix Applied:
Verify the version is 3.46.0.1 or later and test that the EncryptionTool endpoint is no longer accessible or functional.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to EncryptionTool endpoints
- File encryption operations in system logs
- Multiple file modification events in short timeframes
Network Indicators:
- HTTP requests to EncryptionTool-related endpoints
- Unusual traffic patterns to h2o-3 service ports
SIEM Query:
source="h2o.log" AND ("EncryptionTool" OR "encrypt" OR "decrypt") AND NOT user="authorized_user"