Ebay, Inc Bug Bounty - GoStoreGo Administrative Authentication Bypass to all online stores

This attack allowed for a cross store (so essentially unauthenticated, 
as we have not authenticated to our target store) privilege escalation 
attack creating an administrative user on any *.gostorego.com store.

As indicated by their own website, there are over 200,000 active 
stores.This attack allows access to 200,000 x Customers x data = Y.Due 
to the nature of the attack, it would trivial to automate an attack that 
would give us an administrative account on each of these stores with a 
single GET request !!Or you could simply have a great shopping 
experience.Google search site:gostorego.com, find the items you want to 
purchase.Create you admin account (or use stealth mode so all attacks 
are logged as the Store Owner), change the price then buy it or simply 
give yourself some store credit.

This vulnerability was reported to the eBay Enterprise Bug Bounty team on Sunday 9^th    February 2014.

They and the Magento engineering team put out a fix for this issue extremely quickly.  So pats on the back all around are deserved.   I tested the issue and tried a few work arounds, but the fix holds good.  So I want to say a big thanks to them.

Full issue with screen shots can be found at http://www.securatary.com within the vulnerabilities section.

All the best

Mark Litchfield
www.securatary.com






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