CVE-2023-33236
📋 TL;DR
MXsecurity version 1.0 contains hardcoded credentials that allow attackers to craft arbitrary JWT tokens and bypass authentication for web-based APIs. This affects all users running MXsecurity 1.0, enabling unauthorized access to sensitive systems and data.
💻 Affected Systems
- MXsecurity
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, access all data, and pivot to other network systems.
Likely Case
Unauthorized access to sensitive APIs, data exfiltration, and potential privilege escalation within the affected system.
If Mitigated
Limited impact if system is isolated, monitored, and access controls prevent lateral movement.
🎯 Exploit Status
Exploitation requires knowledge of hardcoded credentials but no authentication to initiate attack.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.1 or later
Vendor Advisory: https://www.moxa.com/en/support/product-support/security-advisory/mxsecurity-command-injection-and-hardcoded-credential-vulnerabilities
Restart Required: Yes
Instructions:
1. Download MXsecurity version 1.1 or later from Moxa support portal. 2. Backup current configuration. 3. Install the updated firmware. 4. Restart the device. 5. Verify successful update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate MXsecurity devices from internet and restrict network access to trusted IPs only.
API Access Restriction
allImplement firewall rules to block external access to web-based APIs.
🧯 If You Can't Patch
- Immediately isolate affected systems from internet and untrusted networks
- Implement strict network monitoring for unusual API authentication patterns
🔍 How to Verify
Check if Vulnerable:
Check device version via web interface or CLI. If version is 1.0, system is vulnerable.Check Version:
Check web interface System Information page or use device-specific CLI commandVerify Fix Applied:
Verify version is 1.1 or later and test authentication with invalid credentials to ensure rejection.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful API access
- Unusual JWT token generation patterns
- API access from unexpected IP addresses
Network Indicators:
- Unencrypted JWT tokens in network traffic
- API requests without proper authentication headers
- Traffic to MXsecurity web interfaces from unauthorized sources
SIEM Query:
source="mxsecurity" AND (event_type="authentication" AND result="success" AND user="unknown") OR (http_method="POST" AND uri="/api/*" AND NOT authorization="Bearer *")