Mohan Kallepalli's

Another bug in Facebook. This time on multiple subdomains of FB are found to be vulnerable to brute forcing. Facebook is not limiting the attempts made to access disavowed page, resulting account take over by brute force. Vulnerability Type : Missing rate limiting or anti automation measures Vulnerable Service : Facebook Disavow Vulnerable URL : https://www.facebook.com/hacked/disavow?u=100007881843952&n=JIjLVAuY Vulnerable Domains : All the following domains are found to be vulnerable with the same flaw.   www.facebook.com   www.beta.facebook.com   m.facebook.com   m.beta.facebook.com   iphone.facebook.com   developers.facebook.com   lookaside.facebook.com Attack Scenario : Assume victim has forgot his/her password and used the forgot password feature to reset his/her account password. Now facebook will send a password reset confirmation mail, which contains a link for incase if t...

Instagram application is not validating the number of requests made to login into user account, which made it possible to brute force the password of any Instagram user Account. Issue reported to Facebook through their whitehat program, but unfortunately I am not the first one to do so. So the report was made duplicate and the issue is found to be fixed in few hours. While brute-forcing, the application throughs an error in the response body, but sets an authenticated session cookie. So, once we refresh, the browser uses the newly set cookie and establishes logged in browsing session. The following is a video demonstrating the same ( post brute force action, not the actual brute force).

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Its been a while since i published my last post. So, here i come with a write up for chaining of multiple issues in Facebook Acquisition - Instagram, that could allowed me to delete entire comments/captions from the Instagram DB . Instagram Web and mobile Applications For the first 2 hours or so, I could not find anything as each request is added with a signature and I am lazy enough not to understand/reverse the signature logic. So as usual, i was about the close my Mac and then, saw a request without signature. request without a signature Bingo..something to play around. so i started working on the request, trying to find most common bugs, like sqli,xss, csrf etc.. Then to cross verify a csrf issue, I used my browser. But to my surprise, in later requests in browser app, there is no signature at all, but of-course csrf issue is properly protected. So while testing with both the App and Browser together, I realised that there is an authorisation ...

Hi friends, I am back with Three stories Today. There are multiple critical bugs effecting the e-front, one of the Top 10 e-learing cms available, version 3.6.15.4 build 18023. The details are as follows. Directory Traversal       ( CVE : 2015-4461 ) Local File Inclusion      ( CVE : 2015-4462 ) Bypass for Blocked extension file uploads      ( CVE : 2015-4463 ) About the e-front:   E-front is one of the Top 10 e-learning cms available free on the market till date. A small description from the vendor's site: "The core of eFront is distributed as an open-source project. We have created a superior training product and we are not afraid to let you try it! The open-source edit of eFront will cover a wide range of your needs. If you are looking for a specialized solution then take a look at different efront editions ." The Issues are fixed as part of new release, efront v3.6.15.5 build 18024. You can find the chan...

How I was able to send a mail with Your Email Id? Is it possible? Yes. It is. If you are using Gmail, until yesterday, I can send email with your email id. Do u want to know how? Read my story then.... Hi Friends, This is Mohan Kallepalli, again with another bug in gmail ... Thanks to facebook, another day started with frustration. I will tell u that story another time. Anyway, with the frustration on facebook, i turned my focus to my favorite Google one more time. While I was going through the Gmail settings, thanks to my low speed internet, my browser suggested me to use "Basic HTML". Once i opened my settings in Basic HTML, i went to Accounts section and there i saw the functionality for adding another users email id to your " send email as " list. This functionality is protected by a verification code authentication mechanism. which means, Gmail will send a verification code (9digits) to the target email id and you need to enter that code in your v...

Hi Guys, Another bug in Google.. This time is with youtube.com Hmm.. Found a bug in Youtube.. but unfortunately, this bug is out of scope.. Anyway, a bug is a bug.. Lets see.. The issue is an URL redirection vulnerability that existing in upload.youtube.com. When you upload a video which is not proper (invalid), the application redirects you to error URL. This URL is being sent to the server as a parameter, error_redirect . I tried changing the url to some random domain, and guess what, it redirected as i have uploaded an invalid video. Then, in the request i observed there are two user specific tokens going to the server. They are nothing but anti-csrf tokens and working properly with a valid video. But in the case of an invalid video, they are no longer validated and are being ignored. So i tried to send the request with invalid file, but this time i removed the user specific tokens user_token and session_token . And as i expected, the application issued an 302 redirection...