CVE-2022-23178
📋 TL;DR
CVE-2022-23178 allows unauthenticated attackers to retrieve administrative credentials from Crestron HD-MD4X2-4K-E HDMI switchers by accessing aj.html. This enables complete compromise of affected devices. Organizations using these specific Crestron HDMI switchers with vulnerable firmware are affected.
💻 Affected Systems
- Crestron HD-MD4X2-4K-E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full administrative control of HDMI switcher allowing configuration changes, denial of service, and potential lateral movement if device is integrated with other systems
Likely Case
Unauthorized access to administrative interface leading to configuration tampering, service disruption, and credential theft
If Mitigated
Limited impact if device is isolated on internal network with strict access controls and monitoring
🎯 Exploit Status
Simple HTTP GET request to aj.html endpoint returns credentials in JSON format
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Crestron for updated firmware
Vendor Advisory: https://www.crestron.com/Security/Security_Advisories
Restart Required: Yes
Instructions:
1. Check Crestron website for firmware updates 2. Download latest firmware 3. Upload via web interface 4. Reboot device
🔧 Temporary Workarounds
Network isolation
allPlace device on isolated VLAN with strict access controls
Access restriction
allImplement firewall rules to restrict access to administrative interface
🧯 If You Can't Patch
- Disconnect device from network if not essential
- Implement strict network segmentation and monitor for access attempts
🔍 How to Verify
Check if Vulnerable:
Access http://[device-ip]/aj.html unauthenticated and check if JSON with credentials is returnedCheck Version:
Check web interface login page or device information pageVerify Fix Applied:
Attempt same access after patch - should return error or no credentials📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to aj.html endpoint
- Multiple failed login attempts followed by successful login
Network Indicators:
- HTTP GET requests to /aj.html from unauthorized sources
- Unusual administrative configuration changes
SIEM Query:
source_ip=* AND url_path="/aj.html" AND http_method=GET