YoKo Kho

Category: Web Apps

Collection of the bug that specifically found at web application

Optimizing Hunting Results in VDP for use in Bug Bounty Programs - From Sensitive Information Disclosure to Accessing Hidden APIs which can be used to Retrieve Customer Data

A story when Allah willed me to tried to optimize my findings in the Points-Only program to be able to get 6 paid P1 issues in...

November 15, 2020

Bug Report / Web Apps / Write-Up

From Recon to Bypassing MFA Implementation in OWA by Using EWS Misconfiguration

A story about how I Finally could use an AD account that unenrolled to MFA, by using an EWS Misconfiguration to Access Email Inbox and (Having...

June 19, 2020

Intercept Server Responses Feature on Burpsuite

Bug Report / Web Apps / Write-Up

From 3,99 to 1,650 USD (Part I) – Simple Vertical Privilege Escalation by Changing HTTP Response

A story about how I got several simple bugs (1 P2, 1 P3, and 2 P4s) on a target (that just allow Specific Country Code to...

June 6, 2020

Bug Report / Web Apps / Write-Up

From Recon to Optimizing RCE Results – Simple Story with One of the Biggest ICT Company in the World

How I Finally could Got into an Internal Network (and could accessing all of their internal assets) at One of the Biggest ICT company in the...

February 19, 2020

Bug Report / Web Apps / Write-Up

Race Condition that could Result to RCE – (A story with an App that temporary stored an uploaded file within 2 seconds before moving it to Amazon S3)

In the name of Allah, the Most Gracious, the Most Merciful. – Part I from (hopefully) IV Parts – Update I: Added a “Reference” Section. Update...

September 14, 2019

Bug Report / Web Apps / Write-Up

IDOR (at Private Bug Bounty Program) that could Leads to Personal Data Leaks

In the name of Allah, the Most Gracious, the Most Merciful. Please kindly visit this simple paper directly to looking this release in simple:[English Version] IDOR...

April 17, 2018

Bug Report / Web Apps / Write-Up

Ribose – IDOR with Simple CSRF Bypass – Unrestricted Changes and Deletion to other Photo Profile

In the name of Allah, the Most Gracious, the Most Merciful. Please kindly visit this simple paper directly to looking this release in simple:[English Version] Ribose — IDOR...

April 16, 2018

Bug Report / Web Apps / Write-Up

Bypassing the Current Password Protection at PayPal Tech-Support

In the name of Allah, the Most Gracious, the Most Merciful. Please kindly visit this simple paper directly to looking this release (December, 2017 Article):[English Version]...

December 26, 2017

Bug Report / Web Apps / Write-Up

Information Disclosure at PayPal and Xoom (PayPal Acquisition) via Simple Google Dork – 1,000 USD

In the name of Allah, the Most Gracious, the Most Merciful. Please kindly visit this simple paper directly to looking this release:[English Version] PayPal – Information...

December 26, 2017

Bug Report / Web Apps / Write-Up

Turning Self-XSS into non-Self Stored-XSS via Authorization Issue at “PayPal Tech-Support and Brand Central Portal”

In the name of Allah, the Most Gracious, the Most Merciful. Please kindly visit this simple paper directly to looking this release:[English Version] PayPal — Turning Self-XSS into...

November 12, 2017

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IG: @twitulama @twitulama·

April 10, 2021

Ibnul Qoyim berkata:
"Lisan punya 2 kesalahan yg besar, di mana jika seseorang bebas dari yg satu, dia sulit bisa selamat dari yg satunya: salah dalam bicara & salah dalam diam.

Yang diam dari kebenaran adalah setan yg bisu. Yang mengucap kebatilan adalah setan yang berbicara. https://twitter.com/200Abdulaziz/status/1380717677270949889

Twitter 1380728269595570176

Retweet on Twitter YoKo Kho Retweeted

bend theory @bendtheory·

April 9, 2021

@ninetyn1ne_ The WAF didn’t fully anticipate the underlying application to convert

> to >

by double HTML encoding (which is just encoding the & to &) we can resolve normal HTML entities which are parsed in the javascript event handler.

cloudflare tries to spot alert(1) but fails

Twitter 1380530581537239041

Retweet on Twitter YoKo Kho Retweeted

bend theory @bendtheory·

April 9, 2021

just disclosed my first real report on Hackerone!

https://hackerone.com/reports/789689

might have to do a full write up on HTML entity parsing weirdness :)

#BugBounty #bugbountytips

Twitter 1380524556952166401

Retweet on Twitter YoKo Kho Retweeted

Rohit @sec_r0·

April 8, 2021

🚨🚨 . . New & Free Security Zine . . 🚨🚨

Finally Hashing Zine is here !!!
Must read for devs and bug hunters.
And yes its free.

One single read, will make your knowledge one level above.
https://securityzines.com/zines/hashing.html

#security #infosec #zines #100DaysOfCode #hashing

Twitter 1380208623763169282

Retweet on Twitter YoKo Kho Retweeted

Bug-A-Bee 🐝@securibee·

April 8, 2021

Of course had to be included in best recon methodologies: https://securib.ee/beelog/the-best-bug-bounty-recon-methodology/

Twitter 1380226768171380737

Category: Web Apps

Optimizing Hunting Results in VDP for use in Bug Bounty Programs - From Sensitive Information Disclosure to Accessing Hidden APIs which can be used to Retrieve Customer Data

From Recon to Bypassing MFA Implementation in OWA by Using EWS Misconfiguration

From 3,99 to 1,650 USD (Part I) – Simple Vertical Privilege Escalation by Changing HTTP Response

From Recon to Optimizing RCE Results – Simple Story with One of the Biggest ICT Company in the World

Race Condition that could Result to RCE – (A story with an App that temporary stored an uploaded file within 2 seconds before moving it to Amazon S3)

IDOR (at Private Bug Bounty Program) that could Leads to Personal Data Leaks

Ribose – IDOR with Simple CSRF Bypass – Unrestricted Changes and Deletion to other Photo Profile

Bypassing the Current Password Protection at PayPal Tech-Support

Information Disclosure at PayPal and Xoom (PayPal Acquisition) via Simple Google Dork – 1,000 USD

Turning Self-XSS into non-Self Stored-XSS via Authorization Issue at “PayPal Tech-Support and Brand Central Portal”

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