SECTOR: MOBILE-CORE
Security: Mobile Core - GTP (GPRS Tunnelling Protocol)
GTP is the core protocol for carrying subscriber data and control information in 4G and 5G networks. It is a prime target for user data breakout, TEID-based spoofing, and malicious encapsulation.
🛡️ Tactical Domain Mapping: GTP Security
| GTP Area / Component | Functional Security Objective | ITU Rec (Official PDF) | 3GPP Equiv | 3GPP Target |
|---|---|---|---|---|
| GTP-U (User Plane) | Tunnel Isolation & Integrity | X.1039 | TS 33.117 | Security |
| GTP-C (Control Plane) | Session Mgmt Security | X.1038 | TS 29.274 | Interfaces |
| TEID Spoofing | Non-repudiation & Authenticity | X.805 | GSMA FS.37 | Audit |
| Protocol Filtering | Multi-Layer Availability | Y.2770 | GSMA FS.31 | Security |
🚦 Tactical Release Realizations
For release-specific 3GPP implementations of GTP security (GTPv2 vs. GTPv3), see the generation bridges:
🏛️ Strategic Alignment
- ITU Series: Primarily mapped to itu-t Series-X (Data Networks & Security) and itu-t Series-Y (GII/5G).
- Study Groups: SG17 (Security) and SG13 (Future Networks/5G).
🧪 Penetration Testing Tools
- GTP-Scan: Tool for identifying open GTP-U/C ports and interfaces.
- Scapy-GTP: Python-based packet manipulation for GTP fuzzer development.
- Wireshark-GTP: Protocol analyzer for capturing and dissecting GTP-C/U tunnels.
📋 Field Audit Checklist
[ ]GTP-C Filtering: Are incoming GTP-C messages strictly filtered based on GSMA FS.31?[ ]TEID Randomization: Are Tunnel Endpoint Identifiers (TEIDs) randomized to prevent spoofing?[ ]GTP-U Integrity: Is integrity protection enabled for GTP-U tunnels on the N3 interface (if supported by UE)?[ ]Roaming Hub Verification: Are GTP sessions from unauthorized roaming hubs blocked at the edge?[ ]GTP-in-GTP Detection: Is the GGSN/UPF configured to drop packets with double-encapsulated GTP headers?
!IMPORTANTFS.31 Implementation Note: The GSMA FS.31 (GTP Security Management) provides specific rules for filtering GTP messages from inter-operator Roaming hubs.
Last UpdatedJune 5, 2026
ITU-T Navigator v4.0.0
ReferenceITU Recommendation