Presented at
DEF CON 31 (2023),
Aug. 12, 2023, 10:30 a.m.
(45 minutes)
Contactless credentials have become increasingly popular for secure authentication and access control systems due to their convenience and efficiency. In this talk, we will discuss a specific weakness in the ISO 14443A protocol that enables replay attacks over moderate latency connections, leading to the potential for long-range relay attacks.
During the presentation, we will delve into the history of contactless credential attacks, how manufacturers have adapted, and discuss why we focused on a relay attack. We will provide an overview of the ISO 14443A protocol and explain how the relay attack is executed and the ‘features’ of the underlying protocol that make it possible. Finally, we will demonstrate and release a new tool to make this relay attack feasible with the Proxmark, as we attempt to unlock a door in Ottawa, ON with a card on-stage in Vegas.
In addition, we will discuss the response from HID Global following our responsible disclosure against their SEOS readers and suggest mitigations to prevent these attacks on your access control systems.
Presenters:
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Sam Haskins
- Hacker at Loudmouth Security
Sam Haskins is an honors student at Carleton University, in Ottawa ON, and hacker at Loudmouth Security. Sam is a security researcher in their spare time with several CVEs to their name, with a keen interest in cryptography and RFID hacking.
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Trevor "t1v0" Stevado
- Founding Partner/Hacker at Loudmouth Security
Trevor Stevado is a security researcher and the founder of Loudmouth Security, with over 15 years of experience in the industry. In 2018, Trevor won a Black Badge in the IoT CTF at DEF CON 26, and since then he has been a regular contributor to IoT Village and is now one of the founders of the new Embedded Systems Village, where he continues to push the boundaries of embedded security research.
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