Rush to defend against Heartbleed leads to mistakes with certificates, patches

Some reissued SSL certificates use the same vulnerable key as the ones they replace, and some sites moved to a vulnerable version of OpenSSL

Despite taking prompt action to defend against the Heartbleed attack, some sites are no better off than before -- and in some cases, they are much worse off.

Many of the sites that patched vulnerable OpenSSL installations after the Heartbleed attack was revealed on April 7 then went on to revoke compromised SSL certificates and order new ones. But 30,000 sites are now using replacements based on the same compromised private key as the old certificate, according to a study by Internet services company Netcraft released Friday.

That means that anyone who managed to steal the private key of such a server before it was patched could still use the key to impersonate the server in a man-in-the-middle attack, even with the new certificate in place.

The error is a dangerous one, because the operators of vulnerable servers are likely to believe they have taken all the steps necessary to protect their users, Netcraft warned.

Around 57 percent of sites vulnerable to the Heartbleed attack have so far neither revoked nor reissued their SSL certificates, Netcraft said. A further 21 percent have reissued certificates but not revoked the compromised ones.

The 30,000 sites that revoked their certificates and reissued new ones with the same private key represent around 5 percent of vulnerable sites, according to Netcraft. An additional 2 percent are reusing the same private key and have yet to revoke their old certificates.

Those sites at least are no worse off than the day the Heartbleed attack was revealed.

That's not the case, though, for the roughly 20 percent of servers vulnerable today that were not vulnerable when the attack was revealed: Their operators appear to have replaced safe versions of OpenSSL with flawed ones, according to a study by software developer Yngve Nysæter Pettersen.

"One possibility is that all the media attention led concerned system administrators into believing their system was unsecure. This, perhaps combined with administrative pressure and a need to 'do something', led them to upgrade an unaffected server to a newer, but still buggy version of the system, perhaps because the system variant had not yet been officially patched," he suggested.

Nysæter Pettersen began scanning on April 11, and in the following two weeks around half the vulnerable servers he found were patched, bringing the proportion running vulnerable OpenSSL installations down from 5.36 percent to 2.77 percent. Since then, though, "Patching of vulnerable servers has almost completely stopped," with 2.33 percent still unpatched on Wednesday, he said.

Peter Sayer covers open source software, European intellectual property legislation and general technology breaking news for IDG News Service. Send comments and news tips to Peter at peter_sayer@idg.com.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags patch managementdata protectiononline safetypkiAccess control and authenticationExploits / vulnerabilitiesNetcraft

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

Peter Sayer

IDG News Service
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?