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!

Follow us on twitter at: @ctbbpodcast

We're new to this podcasting thing, so feel free to send us any feedback here: info@criticalthinkingpodcast.io

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(161)

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

Episode 160: Cloudflare Zero-days & Mail Unsubscribing for XSS

Episode 160: Cloudflare Zero-days & Mail Unsubscribing for XSS

Episode 160: In this episode of Critical Thinking - Bug Bounty Podcast Joseph and Brandyn. Chat through some news, Including a Cloudflare Zero-day, Turning List-Unsubscribe into an SSRF/XSS Gadget, & ...

5 Feb 45min

Episode 159: Avoiding Downgrades on Google Cloud VRP with Cote and Darby Hopkins

Episode 159: Avoiding Downgrades on Google Cloud VRP with Cote and Darby Hopkins

Episode 159: In this episode of Critical Thinking - Bug Bounty Podcast we sit down with the Google Cloud VRP Team to deep-dive policy and reward changes, what the panel process looks like, and how to ...

29 Jan 1h 46min

Episode 158: 10hr Marathon Hack-Along Recap + $300k Client-side Bugs

Episode 158: 10hr Marathon Hack-Along Recap + $300k Client-side Bugs

Episode 158: In this episode of Critical Thinking - Bug Bounty Podcast we talk about our personal takeaways from the CTBB Charity Hackalong, and then break down some InsertScript POCs, what a $55,000 ...

22 Jan 58min

Episode 157: Crushing Pwn2Own & H1 with Kernel Driver Exploits

Episode 157: Crushing Pwn2Own & H1 with Kernel Driver Exploits

Episode 157: In this episode of Critical Thinking - Bug Bounty Podcast we’re joined by Hypr to talk about hacking Mediatek and his experiences with HackerOne and Pwn2Own Ecosystems.Follow us on twitte...

15 Jan 1h 34min

Episode 156: Chill AMA from bugbounty.forum

Episode 156: Chill AMA from bugbounty.forum

Episode 156: In this episode of Critical Thinking - Bug Bounty Podcast we answer some fantastic questions from over at bugbounty.forumFollow us on twitter at: https://x.com/ctbbpodcastGot any ideas an...

8 Jan 1h 23min

Episode 155: 2025 Hacker Stats & 2026 Goals

Episode 155: 2025 Hacker Stats & 2026 Goals

Episode 155: In this episode of Critical Thinking - Bug Bounty Podcast Justin, Joseph, and Brandyn reflect on last year of Bug Bounty, and list their goals and predictions for what 2026 holds.Follow u...

1 Jan 1h 32min

Episode 154: Starting a Pentesting Company on Top of Bug Bounty

Episode 154: Starting a Pentesting Company on Top of Bug Bounty

Episode 154: In this episode of Critical Thinking - Bug Bounty Podcast Joseph and Brandyn talk through the transition from Bug Bounty hunting to Pentesting. We cover diversifying income streams, the c...

25 Dec 202541min

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