DNS remains vulnerable one year after Kaminsky bug

Cache poisoning attacks rise amid scramble to patch DNS servers, deploy security add-on

In the meantime, ISPs and Web site operators are seeing a growing number of cache poisoning attacks, although few of them are publicly disclosed.

On July 17, Irish ISP Eircom reported that it was a victim of a cache poisoning attack, which resulted in two major outages and customers being re-directed from popular Web sites such as Facebook to bogus Web sites.

In April, Brazilian bank Bradesco confirmed that some of its customers were redirected to Web sites that tried to steal their passwords because its ISP, Net Virtua, was the victim of a cache poisoning attack.

``We see evidence of cache poisoning attacks because we monitor open recursive servers, and we see it occurring on an ongoing basis,’’ Joffe said. ``A year ago, it was a theoretical threat. Today, it's occurring.’’

The risk of cache poisoning attacks is actually greater than it was a year ago because the Kaminsky flaw is well known in the hacking community.

"The incidence of cache poisoning attacks on the rise, and people are scared because they’re insidious little beasts," Gersch says, pointing out that companies often don't realize they are victims of a cache poisoning attack. "We want to get to DNSSEC, but the industry is working on creative methods to work around the problem until DNSSEC is deployed."

Significant progress has been made in DNSSEC deployment in the last year.

The U.S. federal government mandated that DNSSEC be deployed across its .gov domain by the end of 2009, and it is taking steps to ensure that the DNS root servers are signed during the same time frame. By June 2010, federal agencies will be required to deploy DNSSEC on their internally facing DNS servers, too.

"Around 70 delegations under .gov are signed," Rose said, pointing out that www.nist.gov is one of the early adopters of DNSSEC.

The .org domain supports DNSSEC, as does country code top-level domains operated by Sweden, Brazil, Puerto Rico, Bulgaria and the Czech Republic. Most significant is VeriSign’s plan to deploy DNSSEC on .com and .net, which it says will be accomplished by 2011.

"This certainly has been the year of DNSSEC," Joffe said. "We’ve been at it for 13 years, but this is the year DNSSEC became real."

Some technical glitches remain with DNSSEC, and experts warn that Web sites may be unavailable when their domains switch to the new security protocol because of configuration problems.

"The largest operational hurdles that we’ve seen have been some small home routers and some intrusion detection systems and firewalls with default configurations that have trouble with DNSSEC," Rose said. "Users have to go back and reconfigure those systems for larger responses to handle the keys and signatures that come with DNSSEC."

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

Tags dns flawKaminsky

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Carolyn Duffy Marsan

Network World
Show Comments

Cool Tech

Breitling Superocean Heritage Chronographe 44

Learn more >

SanDisk MicroSDXC™ for Nintendo® Switch™

Learn more >

Toys for Boys

Family Friendly

Panasonic 4K UHD Blu-Ray Player and Full HD Recorder with Netflix - UBT1GL-K

Learn more >

Stocking Stuffer

Razer DeathAdder Expert Ergonomic Gaming Mouse

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Ben Ramsden

Sharp PN-40TC1 Huddle Board

Brainstorming, innovation, problem solving, and negotiation have all become much more productive and valuable if people can easily collaborate in real time with minimal friction.

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?