Phishing at the Top Level

Opinion: ICANN and overbearing governments are gearing up for a major expansion of the attack surface of the DNS.

The use of domain names in most phishing is relatively crude, You see a lot of names like www.somefreewebsite.com/~ingrid/www.bankofamerica.com/.... There's no SSL, and the tricky part of the domain name is off to the right. A user would really have to ignore the domain name and focus on the body of the page, which is where the real phishing expertise comes in.

But a potentially lucrative minefield for phishing domains may open up through a series of developments currently underway. One of them is the move by some governments to develop alternative root servers. The other is the development of internationalized domain names, especially top-level domains. In at least one case the two are combined.

/zimages/1/28571.gifA coordinated attack on the root servers last year didn't get very far. Click here to read more.

The alternative root server is a strange concept to most people. The root servers are the DNS servers that control the root of the DNS. They control the top of the hierarchy or the bottom (root) of the tree, depending on the metaphor you want to use. So eWEEK controls the eweek.com domain; VeriSign controls the .com domain; and the root, the level above .com and also known as "." is controlled by the IANA (the Internet Assigned Numbers Authority).

This Wikipedia article includes a list of alternative roots that exist and the non-standard zones they include. For instance, the home page for OpenNIC is http://opennic.glue/. You might be wondering at that ".glue" top-level domain, and if you click on it you'll get an error. That's because OpenNIC is an alternative root with a completely different name space. Your DNS, probably derivative of your ISP's DNS, doesn't point into the OpenNIC name space. Organizations like OpenNIC sometimes exist in order to escape the control of ICANN. Free to put up any TLD they wish, they have .geek for example.

But OpenNIC does exist on the public Internet; it's not a private network. If your DNS is set up for it, it's possible to see these as well as the real Internet. In fact, UnifiedRoot goes this extra mile, by setting up your systems to see the public DNS as well as their own, on which they sell new TLDs to whoever wants them.

These groups don't worry me. Who's going to use them anyway? I get worried when I see whole countries, like Russia, trying to set up separate roots. In the case of Russia, the government wants more control over the Cyrillic portion of the Internet. They can never have real control as long as the root zone is in the hands of the IANA. Call me a western hegemonist, but I just don't trust the Russian government with a root zone.

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Compounding the Russian issue is the ongoing development of IDNs (Internationalized Domain Names), which are domain names that support non-Latin character sets, including the Cyrillic used in Russia. Work on this has been in standards bodies coordinated by ICANN for years and some are in use. Work on Internationalized TLDs is also underway, and here's where the phishing angle becomes really clear. .ru the Russian TLD, translates in Cyrillic to .py, the TLD for Paraguay. It's not hard to see a Cyrillic phishing domain in the Paraguayan .py being used to fool Russian users.

This specific example isn't the real point. I have a general concern about these expansions of the DNS in ways that seem destined to provide massive new opportunities for abuse. The limitations of freedom for the people of Russia and China, which is also interested in both developments. Internationalized domain names are not inherently objectionable, of course, and it would be great if they could be made to work securely. Unfortunately, I see most of the news being about new browser exploits and scams.

Security Center Editor Larry Seltzer has worked in and written about the computer industry since 1983.

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