Publication by Alexandre De Oliveira and Pierre-Olivier Vauboin | Hackito Ergo Sum 2014
Mobile telecommunication networks form the backbone of modern communication, delivering essential services like calls, SMS, and internet connectivity. However, these networks are built on protocols and architectures that prioritize availability over security, making them vulnerable to cyberattacks.
This research examines the weaknesses of the SS7 and SIGTRAN networks, revealing how attackers exploit these vulnerabilities to target telecom infrastructure and subscribers. Despite some operators investing in network security, incidents like the Belgacom BICS compromise demonstrate that the industry's overall security maturity is still lacking.
Key Topics Explored:
1. Telecom Call Flows and Protocol Layers
- Detailed explanation of typical telecom operations, from phone calls to SMS delivery.
- Breakdown of the protocol layers (SS7, SIGTRAN) involved in these processes.
2. Abusing Telecom Protocols
- Insight into how attackers manipulate protocol fields to exploit weaknesses.
- Methods used to attack operator infrastructure and compromise subscriber data.
3. Real-World Attack Scenarios
- Example of scans performed through international SS7 interconnections.
- Practical demonstrations of spam delivery, SMS spoofing, and user location tracking.
4. Implications for Operators and Subscribers
- Risks posed to operator networks, including traffic interception and fraud.
- Impact on subscribers, such as privacy breaches and phishing attacks.
Why This Research Is Critical
- Highlighting Global Threats: The SS7 and SIGTRAN networks underpin global telecom communication, and their vulnerabilities impact millions of users.
- Empowering Operators: By understanding these weaknesses, telecom operators can strengthen defenses and protect their infrastructure.
- Subscriber Safety: Mitigating these risks ensures safer communication channels and better privacy for end users.
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