November 2018
Beginner to intermediate
270 pages
7h 53m
English
Content preview from Bug Bounty Hunting Essentials
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The Wikiloc XXE
On January 11th, 2016, a researcher called David Sopas published a report about an XXE in an application named Wikiloc, which is an application for sharing the best outdoor trails for hiking, cycling, and many other activities. This website/app has more than a million members, so there's a lot of information.
David Sopas registered an account in the application and was looking for a bicycle, but ended up exploiting a vulnerability...yes, you know, these things happen.
He started to analyze the request. He downloaded a .gpx file to understand the XML structure used by Wikiloc, and he modified the file with these lines:
<!DOCTYPE foo [<!ENTITY xxe SYSTEM "http://www.davidsopas.com/XXE" > ]> <gpx version="1.0" creator="GPSBabel ...
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