Microsoft: MD5 hack poses no major threats to users

In reaction to the news that security researchers have come up with a way to spoof the digital certificates that secure many Web sites, Microsoft downplayed the threat to users.

In reaction to the news that security researchers have come up with a way to spoof the digital certificates that secure many Web sites, Microsoft downplayed the threat to users.

In a security advisory, Microsoft acknowledged the disclosure earlier in the day of an exploit of long-known bugs in the MD5 hashing algorithm used to create the digital certificates that in turn provide proof of a secure connection between users and Web sites. But the software vendor minimized the danger that users could face.

"This new disclosure does not increase risk to customers significantly, as the researchers have not published the cryptographic background to the attack, and the attack is not repeatable without this information," said Microsoft. The company added that it wasn't aware of any actual attacks using the techniques described by an international team of researchers from Germany, the Netherlands, Switzerland and the U.S.

Microsoft also noted that most of the certificate authority vendors that issue digital certificates have abandoned MD5 and upgraded to the more secure SHA-1 algorithm.

However, there are several notable exceptions that still rely on MD5, including VeriSign's RapidSSL.com certificate authorization scheme. The researchers, who presented their findings at a security conference in Berlin today, said they in fact were able to hack RapidSSL.com and produce fake digital certificates.

A more stringent class of digital certificates, dubbed Extended Validation, are always signed using SHA-1, Microsoft added. "As such, [they] are not affected by this newly reported research," the company's advisory read.

Extended Validation, or EV certificates, are supported by all current Web browsers, which display a special icon or shade the address bar when the user surfs to a site secured by one. Microsoft's own Internet Explorer, for instance, turns the entire address bar green when it encounters a site secured by an EV certificate, while Mozilla 's Firefox tints part of its address bar the same color.

Although Microsoft didn't offer any specific steps for users to take to protect themselves in light of today's disclosures, it urged them to keep Windows updated with the latest software patches.

Microsoft wasn't the only company that responded to the news about the exploit of the MD5 bug. Earlier, Mozilla also acknowledged that the MD5 algorithm could be hacked and that phony digital certificates could be created as a result.

"This is not an attack on a Mozilla product, but we are nevertheless working with affected certificate authorities to ensure that their issuing processes are updated to prevent this threat," Johnathan Nightingale, a Mozilla spokesman on security issues, wrote in an entry posted on the company's blog. Like Microsoft's advisory, Nightingale's warning also said that Mozilla hadn't seen any evidence of actual attacks.

Even so, Nightingale recommended that Firefox users remain watchful. "We advise users to exercise caution when interacting with sites that require sensitive information, particularly when using public Internet connections," he wrote.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld (US)
Show Comments

Cool Tech

SanDisk MicroSDXC™ for Nintendo® Switch™

Learn more >

Breitling Superocean Heritage Chronographe 44

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

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

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

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?