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August 9-10, 2023

Black Hat USA 2023

Conference — Las Vegas, USA

Black Hat is the most technical and relevant information security event series in the world. For more than 25 years, Black Hat Briefings have provided attendees with the very latest in information security research, development, and trends in a strictly vendor-neutral environment. These high-profile global events and Trainings are driven by the needs of the security community, striving to bring together the best minds in the industry. Black Hat inspires professionals at all career levels, encouraging growth and collaboration among academia, world-class researchers, and leaders in the public and private sectors.

At this event, Michael Stepankin presents mTLS: When Certificate Authentication is Done Wrong.

Although x509 certificates have been here for a while, they have become more popular for client authentication in zero-trust networks in recent years. Mutual TLS, or authentication based on X509 certificates in general, brings advantages compared to passwords or tokens, but you get increased complexity in return.

In this talk, we’ll deep dive into some novel attacks on mTLS authentication. We won’t bother you with heavy crypto stuff, but instead we’ll have a look at implementation vulnerabilities and how developers can make their mTLS systems vulnerable to user impersonation, privilege escalation and information leakages.

We will present some CVEs we found in popular open-source identity servers and ways to exploit them. Finally, we’ll explain how these vulnerabilities can be spotted in source code and what the safe code looks like.

Meet us also on the GitHub booth. You can also pass by booth 3140 and say Hi 👋🏾 , discuss our approach to help secure open source, and how we use GitHub security products.

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