731: Client side security, XSS attacks & CSP with Stripe’s Alex Sexton

Scott and Wes are joined by security expert, Alex Sexton of Stripe to cover all things: client security, XSS, attack vectors, and CSP (content security policy). Show Notes 00:00 Welcome to Syntax! 00:31 Brought to you by Sentry.io. 00:57 Who is Alex Sexton? 04:44 Stripe dashboard is a work of art. 05:08 Tell us about the design system. React Aria

08:59 Who develops the iOS app? 09:50 Stripe’s CSP (content security policy). 12:50 What even is a content security policy? Content Security Policy explanation

13:57 Douglas Crockford of Yahoo on security. Douglas on GitHub

15:13 Security philosophy. 16:59 What about inline styles and inline JavaScript? 19:41 How do we safely set inline styles from JS? 20:20 Setting up with meta tags. 22:52 What are common situations that require security exceptions? 26:24 Potential damage with inline style tags. 32:45 Looping vulnerabilities. 36:32 What about JavaScript injection? 37:09 Myspace Samy Worm. Myspace Samy Worm Wiki

Sentry.io Security Policy Reporting

42:02 Does a CSP stop code from running in the console? 43:28 What are some general security best practices? 46:35 Strategies for rolling out a CSP. 51:49 Final tip, Strict Dynamic. Strict Dynamic

56:36 Where does the CSP live within Stripe? Original Black Friday story

59:35 One last story. 01:01:20 Sick Picks + Shameless Plugs Sick Picks + Shameless Plugs Alex: Wes Bos’ Instagram

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