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SSRF Spotted in wild: Facebook gives $31k Bug Bounty to a Researcher

In the past few days or so many big bug bounties have been uncovered by the Indian researchers like a $100k bounty from apple and now an SSRF vulnerability has been revealed on Facebook.
In a Medium post, Bipin Jitiya took a deep dive into his first-ever bug bounty payouts to demonstrate how researchers can combine “secure code review, enumeration, and scripting knowledge to find a critical vulnerability”.
A subdomain in which belongs to MicroStrategy which has partnered with Facebook on data analytics projects for several years paid out another $500 for the same flaw after Bipin found the same vulnerability in the MicroStrategy’s demo portal.

How Bipin exploited the SSRF

Firstly, after finding a subdomain that was linked with MicroStrategy SDK Bipin found a session parameter “shortURL” task which processes a short URL and does not check for a valid authentication session. After a while, he found that the URL shortener could leak sensitive info. about the server.

So he chained both of the vulnerabilities and submitted them to Facebook, Later he got a mail from Facebook that they could not reproduce this bug based on the POC’s moreover he realized that the bug had been accidentally patched in the recent updates.

Facebook-SSRF-BugBounty-30k

Another Blind SSRF In MicroStrategy’s SDK

After a few days of research, Bipin found another Blind SSRF in MicroStrategy web SDK. This time it was a “validateServerURL” function that will internally send a GET request to the provided URL. After finding this bug Jitiya immediately reported it to Facebook and Boom! this time he got the bounty worth $30k after the Facebook confirmed that this bug could be reproduced.

Bipin told The Daily Swig that he also “tried to convert SSRF to RCE using a gopher wrapper, but unfortunately, the gopher wrapper was disabled on the Facebook server.”

The $1,000 reward issued via Facebook’s Bugcrowd program arose from Jitiya’s enumeration of internal Facebook infrastructure behind a firewalled environment, after discovering that a ‘shortURL’ task failed to check for a valid authentication session, giving unauthenticated attackers a way in.

Facebook initially “didn’t believe it to be a security vulnerability”, but relented after the researcher outlined attack scenarios enabled by the flaw, including phishing and reflected cross-site scripting (XSS) attacks.

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