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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NCC Group Research & Technology@NCCGroupInfosec·

January 15, 2021

Blog: Sign over Your Hashes - Stealing NetNTLM Hashes via Outlook Signatures - https://research.nccgroup.com/2021/01/15/sign-over-your-hashes-stealing-netntlm-hashes-via-outlook-signatures/ by @johnnyspandex , @Jstorr and @buffaloverflow

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Rahul Maini @iamnoooob·

January 15, 2021

I and @rootxharsh found and exploited a 0Day RCE in Apple's Travel Portal and were rewarded with $50K. Here's the write-up for that:

https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md

Twitter 1349975449934454785

Retweet on Twitter YoKo Kho Retweeted

Sam Curry @samwcyo·

January 15, 2021

Since it's 2021 I'd like to go ahead and disclose some bugs I wasn't able to talk about in 2020. These were issues that either got NDA'd or had long remediation timelines.

The following are quick summaries and proof of concepts for some of the simpler bugs:

Twitter 1350025967331389442

Retweet on Twitter YoKo Kho Retweeted

shubs @infosec_au·

January 13, 2021

@nnwakelam @Rhynorater @thedawgyg @marcioalm Struts, JBoss, UDDIExplorer (WebLogic), Redis, Memcache: https://blog.safebuff.com/2016/07/03/SSRF-Tips/

Twitter 1349306609969766401

Retweet on Twitter YoKo Kho Retweeted

Heath Adams @thecybermentor·

January 13, 2021

Cool way to password spray O365 now that their detection mechanisms are improving:

1) Set up 10 or so free-tier AWS machines with a SSH key pair
2) Use https://github.com/blacklanternsecurity/TREVORspray
3) Profit - pic below for syntax

Full credit goes to @thor_sec for teaching me this

Twitter 1349458744317505537

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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