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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Retweet on Twitter YoKo Kho Retweeted

InfoSec Community @InfoSecComm·

November 30, 2020

New Write-up on InfoSec Write-ups publication : "The YouTube bug that allowed unlisted uploads to any channel" #bugbounty #bugbountywriteup #bugbountytips https://ift.tt/33yk1VU

Twitter 1333545712836104195

Retweet on Twitter YoKo Kho Retweeted

publiclyDisclosed @disclosedh1·

November 30, 2020

Snapchat disclosed a bug submitted by @nahamsec: https://hackerone.com/reports/530974 - Bounty: $4,000 #hackerone #bugbounty

Twitter 1333482240844722179

Retweet on Twitter YoKo Kho Retweeted

PT SWARM @ptswarm·

November 30, 2020

Open redirect parameters from every disclosed @Hacker0x01 report ever, composed in one wordlist

The full list (48 unique): https://github.com/ptswarm/ptswarm-twitter/blob/main/2020-11-30-open-redirect-params.txt

Top 5 sorted by popularity 👇

#ptswarmTechniques

Twitter 1333425260218249216

Retweet on Twitter YoKo Kho Retweeted

Rana Khalil 🇵🇸@rana__khalil·

November 29, 2020

This is my new favourite box! It requires a ton of enumeration and there are so many opportunities to go down rabbit holes. It reminds me of the OSCP exam where it took me forever to solve the boxes but when I wrote up the report, I realized how simple the attack vectors were 😐

Twitter 1332911242051276802

Retweet on Twitter YoKo Kho Retweeted

The Bug Bounty Hunter @tbbhunter·

November 29, 2020

Bcrypt — Account TakeOver Due To Weak Encryption

https://medium.com/bugbountywriteup/bcrypt-account-takeover-due-to-weak-encryption-hr51kdb-4418f6e65907

Twitter 1333036928485253120

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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