Episode 45: The OG Bug Bounty King - Frans Rosen

Episode 45: The OG Bug Bounty King - Frans Rosen

Episode 45: In this episode of Critical Thinking - Bug Bounty Podcast, we're thrilled to welcome Frans Rosén, an OG bug bounty hunter and co-founder of Detectify. We kick off with Frans sharing his journey bug bounty and security startups, before diving headfirst into a host of his blog posts. We also cover the value of pseudo-code for bug exploitation, understanding developer terminology, the challenges of collaboration and delegating tasks, and balancing hacking with parenting. If you're interested in bug bounty or entrepreneurship, you won't want to miss it!

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Shoutout to YTCracker for the awesome intro music!

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Today's Guest:

https://twitter.com/fransrosen

Detectify

Discovering s3 subdomain takeovers

Bucket Disclose

A deep dive into AWS S3 access controls

Attacking Modern Web Technologies

Live Hacking like a MVH

Account hijacking using Dirty Dancing in sign-in OAuth flows

Timestamps:

(00:00:00) Introduction

(00:04:50) Franz Rosen's Bug Bounty Journey and the creation of Detectify

(00:13:30) Benefits of pseudo-code, typing, and thinking like a developer

(00:20:20) Hunter Methodologies

(00:35:40) Time on targets, Iteration vs. Ideation, and tips for standing out

(00:51:10) S3 subdomain takeovers

(01:05:02) Blog posting and hosting motivations

(01:13:30) Detectify and entrepreneurial endeavors

(01:29:50) Attacking Modern Web Technologies

(01:46:00) postMessage and MessagePort

(01:58:09) Live Hacking and Collaboration

(02:13:50) Account Hijacking and OAuth Flows

(02:28:48) Hacking/Parenting

Avsnitt(168)

Episode 168: XSSDoctor - Client-side Path Traversal Research

Episode 168: XSSDoctor - Client-side Path Traversal Research

Episode 168: In this episode of Critical Thinking - Bug Bounty Podcast we’re getting a visit from the XSS Doctor. Jonathan joins us to go through his Client-side workflow, run labs, and diagnose some ...

2 Apr 1h 35min

Episode 167: Stealing Bugs with Valeriy Shevchenko

Episode 167: Stealing Bugs with Valeriy Shevchenko

Episode 167: In this episode of Critical Thinking - Bug Bounty Podcast we welcome Valeriy Shevchenko to talk about program management, anchor programs, and Theft in Bug Bounty.Follow us on twitter at:...

26 Mars 51min

Episode 166: Rez0’s Top Claude Skill Secrets

Episode 166: Rez0’s Top Claude Skill Secrets

Episode 166: In this episode of Critical Thinking - Bug Bounty Podcast we talk about Rez0’s Claude Skill Secrets, when AI Generated reports fall apart, and agents vs filters.Follow us on twitter at: h...

19 Mars 53min

Episode 165: Protobuf Hacking, AI-Powered Bug Hunting, and Self-Improving Claude Workflows

Episode 165: Protobuf Hacking, AI-Powered Bug Hunting, and Self-Improving Claude Workflows

Episode 165: In this episode of Critical Thinking - Bug Bounty Podcast Justin recaps his Zero Trust World experience, before we dive into Permissions issues client-side bugs, New Hardware Hacking Clas...

12 Mars 44min

Episode 164: Tommy DeVoss: From Black Hat to Bug Bounty LEGEND

Episode 164: Tommy DeVoss: From Black Hat to Bug Bounty LEGEND

Episode 164: In this episode of Critical Thinking - Bug Bounty Podcast Justin sits down with Tommy DeVoss to talk about his origin story, Yahoo bugs, and how Tommy first got Justin into Bug BountyFoll...

5 Mars 1h 11min

Episode 163: Best Technical Takeaways from Portswigger Top 10 2025

Episode 163: Best Technical Takeaways from Portswigger Top 10 2025

Episode 163: In this episode of Critical Thinking - Bug Bounty Podcast It’s that time of year again! We’re looking at the Portswigger Research list of top 10 web hacking techniques of 2025.Follow us o...

26 Feb 1h 8min

Episode 162: HackerOne Training AI on Bug Bounty Data?

Episode 162: HackerOne Training AI on Bug Bounty Data?

Episode 162: In this episode of Critical Thinking - Bug Bounty Podcast Justin and Joseph sit down with HackerOne Founder & CTO Alex Rice to discuss concerns of Using Hacker Data for AI and decreasing ...

19 Feb 53min

Episode 161: Cross-Consumer Attacks & DTMF Tone Exfil

Episode 161: Cross-Consumer Attacks & DTMF Tone Exfil

Episode 161: In this episode of Critical Thinking - Bug Bounty Podcast Justin Gives us some quick hits regarding CSRF and Cross Consumer Attacks, and also touches on some breaking questions surroundin...

12 Feb 24min

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