Episode 58: Youssef Sammouda - Client-Side & ATO War Stories
Critical Thinking - Bug Bounty Podcast15 Feb 2024

Episode 58: Youssef Sammouda - Client-Side & ATO War Stories

Episode 58: In this episode of Critical Thinking - Bug Bounty Podcast we finally sit down with Youssef Samouda and grill him on his various techniques for finding and exploiting client-side bugs and postMessage vulnerabilities. He shares some crazy stories about race conditions, exploiting hash change events, and leveraging scroll to text fragments.

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!

------ Links ------

Follow your hosts Rhynorater & Teknogeek on twitter:

https://twitter.com/0xteknogeek

https://twitter.com/rhynorater

------ Ways to Support CTBBPodcast ------

Sign up for Caido using the referral code CTBBPODCAST for a 10% discount.

Hop on the CTBB Discord at https://ctbb.show/discord!

We also do Discord subs at $25, $10, $5 - premium subscribers get access to private masterclasses, exploits, tools, scripts, un-redacted bug reports, etc.

Today’s Guest: https://twitter.com/samm0uda?lang=en

https://ysamm.com/

Resources:

Client-side race conditions with postMessage:

https://ysamm.com/?p=742

Transferable Objects

https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Transferable_objects

Every known way to get references to windows, in javascript:

https://bluepnume.medium.com/every-known-way-to-get-references-to-windows-in-javascript-223778bede2d

Youssef’s interview with BBRE

https://www.youtube.com/watch?v=MXH1HqTFNm0

Timestamps:

(00:00:00) Introduction

(00:04:27) Client-side race conditions with postMessage

(00:18:12) On Hash Change Events and Scroll To Text Fragments

(00:32:00) Finding, documenting, and reporting complex bugs

(00:37:32) PostMessage Methodology

(00:45:05) Youssef's Vuln Story

(00:53:42) Where and how to look for ATO vulns

(01:05:21) MessagePort

(01:14:37) Window frame relationships

(01:20:24) Recon and JS monitoring

(01:37:03) Client-side routing

(01:48:05) MITMProxy

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

Populärt inom Teknik

uppgang-och-fall
market-makers
elbilsveckan
bilar-med-sladd
rss-elektrikerpodden
skogsforum-podcast
rss-veckans-ai
rss-laddstationen-med-elbilen-i-sverige
natets-morka-sida
bli-saker-podden
bosse-bildoktorn-och-hasse-p
rss-en-ai-till-kaffet
rss-uppgang-och-fall
rss-ai-med-katarina-gospic-och-viggo-cavling
rss-technokratin
developers-mer-an-bara-kod
rss-it-sakerhetspodden
rss-fabriken-2
rss-digitala-influencer-podden
garagehang