Diameter Fuzzer
Diameter (3GPP S6a, Cx, Ro, Gy)Stateful fuzzing framework for Diameter base protocol and 3GPP application interfaces, uncovering parsing flaws and state machine vulnerabilities in HSS/DRA nodes.
Diameter Fuzzer is an open-source Protocol Fuzzing & Crash Discovery component included in TelcoChisel for telecommunications security auditing. It targets Diameter (3GPP S6a, Cx, Ro, Gy) infrastructure for compliance with 3GPP and GSMA telecom security standards.
diameter-fuzzerHardware: Ethernet / SCTP / TCP SocketDiameter Protocol Fuzzing Suite
Diameter-Fuzzer is a high-speed, stateful security fuzzer designed for 4G LTE and IMS telecommunication core signaling. It validates Diameter Routing Agents (DRA), Home Subscriber Servers (HSS), and Charging Gateways against malformed Attribute-Value Pairs (AVPs), length mismatch overflows, and cyclic routing loops.
Attack Surface Tested
- AVP Length Mismatches & Boundary Overflows: Test DRA and HSS parsers for heap corruption when decoding nested Grouped AVPs.
- Diameter Loop Attacks: Craft
Route-RecordAVPs to induce routing loops across international Diameter interconnects (IPX / GRX). - Session State Exhaustion: Burst millions of concurrent
Auth-Session-Stateinitialization requests to consume DRA memory tables.
Pre-installed TelcoChisel Cheatsheet
1. Fuzz S6a Interface with Dynamic Mutation
# Target HSS S6a interface on port 3868
diameter-fuzzer --target 10.10.10.50 --port 3868 --app-id 16777251 --mutation-rate 0.05
2. Verify Crash Logs & Heartbeat Monitoring
# Continuous Device-Watchdog-Request (DWR) watchdog monitor
diameter-watchdog --target 10.10.10.50 --interval 2s --alert-on-timeout
Practice in TelcoSec Cloud Academy
To practice fuzzing core telecom infrastructure safely: 👉 Access the Core Signaling Security Lab at App.TelcoSec.Net
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