Internet users advised to change passwords after encryption flaw found

Bug makes personal user data such as passwords, banking information and healthcare statistics vulnerable to theft by hackers, web security experts say

PUBLISHED : Wednesday, 09 April, 2014, 9:23am
UPDATED : Thursday, 10 April, 2014, 11:09am

A newly discovered bug in widely used web encryption technology has made data on many of the world’s major websites vulnerable to theft by hackers in what experts say is one of the most serious security flaws uncovered in recent years.

The finding of the so-called “Heartbleed” vulnerability, by researchers with Google and a small security firm called Codenomicon, prompted the US government’s Department of Homeland Security to advise businesses on Tuesday to review their servers to see if they were using vulnerable versions a type of software known as OpenSSL.

It said updates are already available to address the vulnerability in OpenSSL, which could enable remote attackers to access sensitive data including passwords and secret keys that can decode traffic as it travels across the internet.

“We have tested some of our own services from attacker’s perspective. We attacked ourselves from outside, without leaving a trace,” Codenomicon said on a website called it built to provide information about the threat.

Computer security experts warned that means victims cannot tell if their data has been accessed, which is troubling because the bug has existed for about two years.

“We are working to implement the fix across the rest of our sites right now.”

“If a website is vulnerable I could see things like your password, banking information and healthcare data, which you were under the impression you were sending securely to your website,” said Michael Coates, director of product security for Shape Security.

Chris Eng, vice-president of research with software security firm Veracode, said he estimates hundreds of thousands of web and e-mail servers around the globe need to be patched as soon as possible to protect them from attack by hackers who will rush to exploit the vulnerability now that it is publicly known.

The technology website Ars Technica reported that security researcher Mark Loman was able to extract data from Yahoo Mail servers by using a free tool.

A spokesperson for Yahoo confirmed that Yahoo Mail was vulnerable to attack, but said it had been patched along with other main Yahoo sites such as Yahoo Search, Finance, Sports, Flickr and Tumblr.

“We are working to implement the fix across the rest of our sites right now,” she said on Tuesday evening.