Researchers bypass Google redirect notice

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Burmese hacker group post proof of concept.

The Burmese YGN hacker group has detailed a URL redirect vulnerability that bypasses Google’s checks to point users to malicious websites.

The flaw exists in the way that Google checks redirected URLs against a blacklist of known malicious web sites.

The attacker would send a victim a proxy server link which redirected to a malicious URL and, when clicked, would verify if the landing website was blacklisted by Google.  

If it was, the server would generate a second malicious URL to infect users.

Researchers posted a proof of concept of the vulnerability on the YGN site.

Google redirect notice:

http://www.google.com/url?sa=t&url=http%3A%2F%2Fattacker.in%2Fmalware_exists_in_this_page%2F.

Bypass:

http://www.google.com/url?sa=t&url=http%3A%2F%2Fattacker.in%2Fmalware_exists_in_this_page%2F&usg=AFQjCNEBtpLqGPICIMz5TJZqfNsZKtHbRg

“The bypass link will last as long as Google doesn't change its internal algorithm that compares the hash against the provided URL,” researchers said.

Google posted tips to mitigate the risk of abuse of open redirect URLs.

Copyright © SC Magazine, Australia


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