Friday, July 29, 2005

Phishers Steal Trust from eBay Sign In Pages

Via Netcraft.

Fraudsters have exploited a flaw in the eBay web site that allows them to orchestrate phishing attacks using eBay's own Sign In page.

Registered users of eBay's popular online auction web site must sign in using a username and password in order to participate in bidding and listing of items. A new style of phishing attack reported through the Netcraft Toolbar community shows fraudsters exploiting flaws on the Sign In page and on another ancilliary page which results in victims being redirected to the fraudster's phishing site after they have logged in.

This particular attack starts off like many others, by sending thousands of emails that instruct victims to update their eBay account details by visiting a URL. However, that is where the similarity ends, because the URL in this case actually takes the victim to the genuine eBay Sign In page, hosted on signin.ebay.com. By including special parameters at the end of the URL, the fraudster has changed the behaviour of the Sign In page so that when a user successfully logs in, they will then be sent to the fraudster's phishing site via an open redirect hosted on servlet.ebay.com.

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