CVE-2022-24400
📋 TL;DR
This vulnerability in TETRA authentication allows a man-in-the-middle attacker who can predict the MS challenge RAND2 to set the session key DCK to zero, effectively breaking encryption. This affects TETRA radio communication systems used by public safety, military, and critical infrastructure organizations. The flaw enables unauthorized decryption of supposedly secure communications.
💻 Affected Systems
- TETRA radio systems
- TETRA base stations
- TETRA mobile terminals
- TETRA infrastructure equipment
📦 What is this software?
Tetra\ by Midnightblue
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of encrypted TETRA communications allowing interception, manipulation, and injection of traffic across critical infrastructure, public safety networks, and military communications.
Likely Case
Selective decryption of targeted communications in vulnerable TETRA networks, potentially exposing sensitive operational information and enabling traffic analysis.
If Mitigated
Limited impact if proper network segmentation, monitoring, and alternative authentication mechanisms are in place to detect and prevent MITM attacks.
🎯 Exploit Status
Requires MITM position and ability to predict RAND2 challenge; exploitation requires specific knowledge of TETRA protocols and network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available - protocol-level flaw
Vendor Advisory: https://tetraburst.com/
Restart Required: No
Instructions:
Contact TETRA equipment vendors for firmware updates or workarounds; consider migration to more secure communication protocols where possible.
🔧 Temporary Workarounds
Network segmentation and monitoring
allIsolate TETRA networks from other systems and implement strict network monitoring for MITM indicators
Enhanced authentication controls
allImplement additional authentication layers beyond standard TETRA authentication where possible
🧯 If You Can't Patch
- Implement strict physical and network access controls to prevent MITM positioning
- Use additional encryption layers on top of TETRA communications for sensitive data
🔍 How to Verify
Check if Vulnerable:
Review TETRA equipment specifications and consult with vendors about authentication implementation; test with authorized penetration testing in controlled environments onlyCheck Version:
Vendor-specific commands vary; consult equipment documentation for firmware version checksVerify Fix Applied:
Verify with vendors that equipment implements updated authentication procedures or workarounds; conduct security testing in authorized environments📡 Detection & Monitoring
Log Indicators:
- Authentication failures
- Unusual authentication patterns
- Multiple authentication attempts from same source
Network Indicators:
- Unusual traffic patterns in TETRA networks
- Suspicious MITM positioning indicators
- Abnormal authentication protocol exchanges
SIEM Query:
Search for authentication anomalies in TETRA network logs, focusing on RAND2 challenge patterns and DCK key establishment