STATUS: ACTIVE
SECTOR: ITU-R
LEVEL: UNCLASSIFIED // RESEARCH
Tactical Mapping: 4G/5G Radio Interface Security (M.2012 / M.2150)
This document provided a technical mapping of the security features and vulnerabilities for the IMT-Advanced (4G) and IMT-2020 (5G) radio interfaces.
🏗️ 1. IMT-2020 (5G) New Radio (NR) Security Features
The 5G NR interface (M.2150) introduces significant security enhancements over legacy systems.
🛡️ SUPI / SUCI Privacy (The "Fake eNodeB" Fix)
- Mandate: The user's permanent identity (SUPI) must never be sent in cleartext over the air.
- Mechanism: The UE (User Equipment) encrypts the SUPI with the home network's public key, creating a SUCI (Subscription Concealed Identifier).
- Vulnerability: Rogue Base Stations attempting to capture the IMSI (IMSI-Catching) fail because they only see the encrypted SUCI.
- M.2150 Alignment: Secure identifier framework (3GPP TS 33.501).
🛡️ RRC Integrity Protection for User Plane (UP-IP)
- Mandate: 5G allows for optional integrity protection of user data (User Plane).
- Mechanism: NIA1/NIA2/NIA3 algorithms applied at the PDCP (Packet Data Convergence Protocol) layer.
- Vulnerability: Prevention of "Bidding Down" or "A5/1-style" packet modification.
- M.2150 Alignment: PDCP security requirements.
🏗️ 2. IMT-Advanced (4G) LTE Security (M.2012)
4G LTE remains a critical fallback for most global networks.
🛡️ AS / NAS Security Separation
- Mechanism: Separation of Access Stratum (AS) security (UE-to-eNodeB) and Non-Access Stratum (NAS) security (UE-to-MPE).
- Vulnerability: Compromise of an eNodeB (Physical access) does not allow decryption of the NAS signaling core traffic.
- M.2012 Alignment: Secure key layering and hierarchy.
📡 3. Physical Layer Attack (PLA) Vector Matrix
| Attack Vector | Target Interface | Vulnerability | ITU Mitigation |
|---|---|---|---|
| RF Jamming | Downlink PDSCH | Denial of Service for specific coverage area. | M.2150 Interference Rules |
| Pilot Spoofing | PSS / SSS | Redirecting UE to a malicious cell. | M.2150 Cell Selection rules |
| Paging Attack | PCH (Paging Channel) | Energy drain on UE battery / IMSI discovery. | M.2150 Paging ID Hiding |
| GTP-U Sniffing | Backhaul (S1-U/N3) | Unencrypted user payload extraction. | M.2150 Tunnel Encryption |
🧪 Operational Audit Reference
- 5G NR Audit Portfolio: For auditing core-to-radio signaling.
- 4G Radio Audit Checklist: For tactical field assessments of legacy eNodeB security.
Generated by TelcoSec-ITU-Navigator Logic Engine.
Temporal SignatureSYNC_ID: 19E4041393A
ITU-T Navigator v4.0.0
IntegritySIGNAL: SECURE