Introduction Since my recent interest in Bug Bounties, while I was at DEFCON 26, I wanted to meet HackerOne staff. Used it to login at app.bountypay.h1ctf.com exploiting css injection to bypass 2FA. Stars. 2020-06-05 GraphQL and Apollo with Android From Novice to Expert 2020-06-05 Java On Azure Building Spring Boot Microservices 2020-06-05 Raising The Bar Again For Azure Sql Database With Centrally Managed Encryption. Hackcon CTF’19 – GIMP IT Writeup. 281 likes. first i thought the code was like which is only defined on the ?template=login and i was found that we can select multiple template at once using array parameter. this mindset help me to keep motivated when encounter a dead end. If nothing happens, download the GitHub extension for Visual Studio and try again. Winners will get an all expenses paid trip to New York City to hack against HackerOne 1337 and a chance to earn up to $100,000 in bounties. 27/04/2019. Game of Thrones CTF: 1 - Vulnhub Writeup. Haythem Elmir 3 ans ago. I was using Hackvector to view the cookie as plain text and send it as base64 this plugin is very handy, it was possible to make the backend send the request to another location. Sep 6, 2016 • ctf. By reading the AndroidManifest.xml file i assume the challenge have 3 part to solve and could be solve with using an deepling for each part. Using the staff credentials to exploiting staff.bountypay.h1ctf.com the website still using base64 cookie but now its signed with something and it unreadable also we cannot tamper the cookie. Use Git or checkout with SVN using the web URL. thingking of Software Storage the words of backup files always come into my mind and i tried to bruteforce the folder using the proxy and found there is an /upload folder containing BountyPay.apk which is the next challenges https://software.bountypay.h1ctf.com/uploads/BountyPay.apk. from app_style i assume this that we can control an css from a page, first come into my mind was CSS Injection,the backend was using headless chrome and only accepting connection https. Hacker101 CTF 0x00 Overview. HackerOne h1-212 CTF Write-Up/Solution. send the report url to the bot give us the cookie, with the admin cookie i can view the martenmickos password. Contribute to manoelt/50M_CTF_Writeup development by creating an account on GitHub. There's also the riscure Embedded Hardware CTF series, and he has a bunch of individual CTF writeup videos as well. If nothing happens, download Xcode and try again. License. H1-2006 CTF Write-up HackerOne recently held a CTF with the objective to hack a fictitious bounty payout application. Descrição massa - - Github - https://github.com/jteles - Twitter - twitter.com/c4pt41nnn - Telegram - @c4pt41nnn - Hack The Planet o/ His Pwnie Island CTF series is my favourite; the challenges are super interesting and his explanations are easy to understand, even if you know nothing but about underlying concepts. by Abdillah Muhamad — on hackerone 01 Jun 2020. we can make it visible by supplying the right params on the deeplink two://part?two=light&switch=on and we prompted to enter header value we can enter X-Token got this value from base64 on the PartThreeActivity code. Given an web application with wildcard scope *.bountyapp.h1ctf.com, as stated at @Hacker0x01 Twitter the goal of the CTF is to help @martenmickos to approve May Bug Bounty payments. also tried to decode the cookie token=eyJhY2NvdW50X2lkIjoiRjhnSGlxU2RwSyIsImhhc2giOiJkZTIzNWJmZmQyM2RmNjk5NWFkNGUwOTMwYmFhYzFhMiJ9 and the interesting part is our account_id is used by the web server to build new request into the api.bountypay.h1ctf.com, the cookie is not having tampering protection so i was able to modify the account_id and making the api to request another enpodints. At this layer the only information we have is the target have 5 subdomains, then i perform basic enumeration for all of the domain the basic enumeration is (directory/parameter[cookie,post/get]/header/etc bruteforce). also there is an open redirect on the api https://api.bountypay.h1ctf.com/redirect?url=https://www.google.com/search?q=REST+API, this endpoint only able to redirect to whitelisted domain, i was spent tons of hours to bypass but actually we don’t need to bypass it, By combining the open redirect to the proxy request at account_id we can turn this into SSRF, Long story short https://staff.bountypay.h1ctf.com and https://software.bountypay.h1ctf.com is whitelisted into the redirect and i tried to access the https://software.bountypay.h1ctf.com with the proxy give me an login page with title Software Storage, this below the full request and response. December 17, 2017 December 17, 2017 aadityapurani 6 Comments. Hacker101 is a free educational site for hackers, run by HackerOne. H1-2006 CTF Write-up HackerOne recently held a CTF with the objective to hack a fictitious bounty payout application. While browsing Twitter for my daily dose of cat pics I came across a call for help requesting the aid of hackers all around the world to recover @jobertabma’s important document. If you are a ethical hacker (Good Guys) and have not used Hackerone platform for Bug Bounty yet, do… Hacker101 CTF Writeup. Opening the application will prompt you to input username and (optional) twitter, after you submit it will bring you to PartOneActivity but have nothing visible on the User Interface, it because this part of code haven’t executed yet. If you are a ethical hacker (Good Guys) and have not used Hackerone platform for Bug Bounty yet, do ... Read More InCTF 2017 Writeup. Hey guys in this video I showed how to complete the first TRIVIA CTF. As an avid CTF'er, I was very much excited when I heard about the H1-212 CTF. Really a good place to apply all the pen test skills for beginners. There is also a report endpoint that accepts an url from the user in base64 encoded format tried to send /admin/upgrade?username=sandra.allison in base64 encoded but it doesn’t work as the bot will ignore everything behind /admin. Ssti ctf writeup. https://github.com/bounty-pay-code/request-logger, https://app.bountypay.h1ctf.com/bp_web_trace.log, https://twitter.com/SandraA76708114/status/1258693001964068864, CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory, CWE-918: Server-Side Request Forgery (SSRF), CWE-601: URL Redirection to Untrusted Site (‘Open Redirect’), CWE-73: External Control of File Name or Path, Directory bruteforce app.bountypay.h1ctf.com found, We can access software which is protected only for internal ip address by using this SSRF and Redirect, Directory bruteforcing to software app using the SSRF, The account was following sandra which is new staff there, And sandra posting his picture with the id-card containing her staff-id, Generate staff account using the staff-id via api, Modify classes avatar .upgradeToAdmin .tab4, Extract 2FA using CSS Injection,setup your callback and use this. Can you retrieve the document before he does? Vulnerability exist inside Select a book functionality. Shout out to the problem setter @adamtlangley and @B3nac Thanks for making awesome CTF Challenge, also @Hacker0x01 for Organizing the CTF, This was a great learning experience from solving the challenge. I saw a tweet from HackerOne and I was determined to try to meet someone from HackerOne! Hacker101 CTF is part of HackerOne free online training program. 0x01 CTF. Learn more. spaCy Tutorial - Complete Writeup. If nothing happens, download GitHub Desktop and try again. HackerOne H1-2006 2020 CTF Writeup. Bypassing 2FA giving us the cookie to authenticate as the user, the authentication user only have 2 thing to try, logout and load transaction (app.bountypay.h1ctf.com/statements?month=06&year=2020), the logout function have nothing interesting and i look more deep into /statements endpoint. HackerOne H1-2006 2020 CTF Writeup Writeup H1-2006 CTF The Big Picture Given an web application with wildcard scope *.bountyapp.h1ctf.com, as stated at @Hacker0x01 Twitter the goal of the CTF is to help @martenmickos to approve May Bug Bounty payments. I was found at the app.bountypay.h1ctf.com domain is have .git folder, i was able to access app.bountypay.h1ctf.com/.git/config which is contains a public repository (https://github.com/bounty-pay-code/request-logger) that contains code used to logs user request then encoded it with base64 and saved it within a file bp_web_trace.log and the file is accessible from the website app.bountypay.h1ctf.com/bp_web_trace.log after decoding the request i found credentials if a customer. Reading the javascript give me clue that the admin have an ability to upgrade user to admin by sending a GET request, if i have an XSS on the profile name or avatar i can use to trigger the admin execute the upgrade user, but turns out that profile and avatar is cannot broken into an xss as it only accepts [A-Za-z0-9]. and i write this evil.css to extract code_1 to code_7 from the server, the listener will get back to you like this image below. you need to sort the code to uICTuNw and send it to the 2FA payment challenge to claim your flag ^FLAG^736c635d8842751b8aafa556154eb9f3$FLAG$. The information leaked from the APK could be used for the next step, the goal from this apk to getting the value of X-Token to be able hit the api.bountypay.h1ctf.com directly. $50 Million CTF from Hackerone - Writeup. Hacker101 CTF is part of HackerOne free online training program. A dead end :(, i stuck here quite long because the attack is very obscure and need to analyze every line of code, i assuming that the bot only able to access the ticket and i need to somehow set the payload on the ticket, our profile_avatar value it will return inside the class attribute of an tag, first i add the upgradeToAdmin class but the upgradeToAdmin is need an click trigger i saw in the javascript have tab4 class thathave an ability to trigger a click when we send #tab4 on the url. HackerOne’s mission is to empower the world to build a safer internet, and you are the heroic individuals making that mission a day-to-day reality. If you have any questions or feedback, please email us at h1-212@hackerone.com. Homepage. Work fast with our official CLI. 1 PPP (Partai Persatuan Pwning) Writeup Capture The Flag SlashRoot CTF 2. 0x01 CTF I always perform subdomain enumeration when it comes into wildcard targets and crt.sh always give most of the result. They are fun, but they also provide a opportunity to practise for real-world security challenges. open the third activity with this deeplink three://part?three=UGFydFRocmVlQWN0aXZpdHk=&switch=b24=&header=X-Token the application will put the Token to shared_preferences/user_created.xml file and on the debug log, grab the leaked hash from this file shared_preferences/user_created.xml (8e9998ee3137ca9ade8f372739f062c1) and submitted to PartThreeActivity, from the debug log we can see that the Host is api.bountypay.h1ctf.com used X-Token:8e9998ee3137ca9ade8f372739f062c1 to hit api.bountypay.h1ctf.com/ endpoints was valid. Recently HackerOne conducted a h1-212 CTF wherein 3 winners will be selected from those who managed to solve the CTF and submitted write-up. Disclaimer I did not solve this puzzle. Using deeplink to solve all the part, i also use Intent Launcher. Always keep the mindset The bug is there, its just the matter of time to found the bug, if you don't others will found it. I use this deeplink to mark the PARTONE as COMPLETE one://part?start=PartTwoActivity, then we entered the PartTwoActivity there is also no User Interface visible because the code hide it. I am using Intent Launcher to save all the deeplink history and Wifi ADB to connect to my phone without wires. Opening this url https://staff.bountypay.h1ctf.com/?template[]=login&template[]=ticket&ticket_id=3582&username=sandra.allison#tab4 will give the valid request to upgrade user to admin, sending this url with base64 encoded will give you a cookie with min privs. Source code for Hacker101. I classified this vulnerability with CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory. Hacker101 CTF is part of HackerOne free online training program. I know, you are here to read the write-ups for the Hackerone CTF (h1-702) which is an online jeopardy CTF conducted by the amazing team of Hackerone. Find out who won and read their solution write-ups in this post. 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