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DerpCon 2020 - .NET Roulette: Exploiting Insecure Deserialization in Telerik UI - Caleb Gross

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So you're pentesting a .NET application, and you notice the server is deserializing user input—great! You know this is bad in theory, but have no idea how to actually get a shell in time for the engagement. This talk will bring you up to speed on how .NET deserialization works and how to get shells on real applications.

 

In this presentation, we'll dig into the internals of CVE-2019-18935, a deserialization vulnerability that allows RCE on the popular web UI suite Telerik UI for ASP.NET AJAX. After demonstrating how to exploit this issue step-by-step, you'll learn a hands-on approach to debugging a locally running ASP.NET application, quickly assessing the site's attack surface, and examining possible avenues for finding and exploiting insecure uses of deserialization. This talk is intended for penetration testers and security researchers who'd like to begin testing deserialization vulnerabilities in .NET software.

 

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