CVE-2023-42034
📋 TL;DR
This vulnerability in Visualware MyConnection Server allows remote attackers to bypass authentication via cross-site scripting (XSS) in the doRTAAccessCTConfig method. Attackers can inject malicious scripts without proper authentication, potentially gaining unauthorized access. Organizations running affected MyConnection Server installations are at risk.
💻 Affected Systems
- Visualware MyConnection Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where attackers gain administrative access, steal sensitive data, deploy ransomware, or pivot to other network systems.
Likely Case
Unauthorized access to MyConnection Server functionality, data exfiltration, or use as an initial foothold for further attacks.
If Mitigated
Limited impact with proper network segmentation, web application firewalls, and monitoring detecting exploitation attempts.
🎯 Exploit Status
ZDI-CAN-21613 indicates proof-of-concept exists in controlled disclosure. Minimal interaction required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://myconnectionserver.visualware.com/support/security-advisories
Restart Required: Yes
Instructions:
1. Review vendor security advisory. 2. Download latest patched version. 3. Backup configuration and data. 4. Install update following vendor instructions. 5. Restart MyConnection Server services. 6. Verify functionality.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF with XSS protection rules to block exploitation attempts
Network Segmentation
allRestrict access to MyConnection Server to trusted networks only
🧯 If You Can't Patch
- Isolate MyConnection Server behind firewall with strict access controls
- Implement strong monitoring and alerting for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check MyConnection Server version against vendor advisory. Test for XSS vulnerabilities in doRTAAccessCTConfig endpoint.Check Version:
Check MyConnection Server web interface or configuration files for version informationVerify Fix Applied:
Verify updated version matches patched version from vendor advisory. Test that authentication bypass via XSS is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Access to doRTAAccessCTConfig with script-like parameters
- Failed authentication followed by successful access
Network Indicators:
- HTTP requests to doRTAAccessCTConfig with script injection patterns
- Unexpected administrative access from new IP addresses
SIEM Query:
source="myconnection_server" AND (uri="*doRTAAccessCTConfig*" AND (param="*<script>*" OR param="*javascript:*"))