CVE-2023-6569
📋 TL;DR
This vulnerability in h2oai/h2o-3 allows attackers to control file paths used by the application, potentially leading to arbitrary file writes or reads. It affects users of the h2o-3 machine learning platform who expose the vulnerable functionality. The issue stems from insufficient validation of user-supplied file paths.
💻 Affected Systems
- h2o-3
📦 What is this software?
H2o by H2o
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution via arbitrary file write leading to complete system compromise, data exfiltration, or service disruption.
Likely Case
Arbitrary file read/write allowing sensitive data exposure, configuration tampering, or denial of service.
If Mitigated
Limited impact with proper file system permissions and input validation in place.
🎯 Exploit Status
Exploitation requires access to the vulnerable endpoint/functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest h2o-3 releases for fix
Vendor Advisory: https://github.com/h2oai/h2o-3/security/advisories
Restart Required: Yes
Instructions:
1. Update h2o-3 to the latest patched version. 2. Restart the h2o-3 service. 3. Verify the fix is applied.
🔧 Temporary Workarounds
Restrict Access
allLimit network access to h2o-3 services to trusted sources only.
Use firewall rules to restrict inbound connections to h2o-3 ports
Input Validation
allImplement additional input validation for file path parameters.
Configure application-level validation to reject suspicious file paths
🧯 If You Can't Patch
- Implement strict network segmentation and access controls
- Monitor for suspicious file operations and path traversal attempts
🔍 How to Verify
Check if Vulnerable:
Check h2o-3 version against patched releases; test for path traversal via controlled file path inputs.Check Version:
h2o --version or check h2o-3 package version in deploymentVerify Fix Applied:
Update to latest version and retest path traversal attempts; verify file operations are restricted to intended directories.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns
- Path traversal strings in request logs
- Failed file operations with suspicious paths
Network Indicators:
- Requests with file path parameters containing directory traversal sequences (e.g., ../)
SIEM Query:
source="h2o-3" AND (path="*../*" OR file="*../*")