Security researchers have discovered a flaw affecting Google's Chrome browser which exposes it to clickjacking — where an attacker hijacks a browser's functions by substituting a legitimate link with one of the attacker's choice.
(Credit: Google)
Google has acknowledged the flaw and is working towards a patch for Chrome versions 1.0.154.43 and earlier when running within Windows XP SP2 systems, according to SecNiche security researcher Aditya K Sood.
Sood disclosed the flaw on 27 January and has since posted a proof of concept on the Bugtraq vulnerability disclosure forum.
"Attackers can trick users into performing actions which the users never intended to do and there is no way of tracing such actions later, as the user was genuinely authenticated on the other page," Sood said within the disclosure.
While Google is working on a fix, a spokesperson for the Australian arm of the company pointed out that clickjacking affected all browsers, not just Chrome.
"The [clickjacking] issue is tied to the way the web and web pages were designed to work, and there is no simple fix for any particular browser. We are working with other stakeholders to come up with a standardised long-term mitigation approach," they said.
However, independent security researcher, CEO of Australian security consultancy Novologica, Nishad Herath, told ZDNet.com.au that after running Sood's proof of concept he found that Internet Explorer 8 (release candidate 1 and beta 2 versions) and Opera 9.63 (the latest version) were not exposed to the flaw. But, like Chrome, Firefox 3.0.5 was exposed.
Google's security researchers had not found any attacks in the wild which exploited the specific vulnerability, said Google's spokesperson.
Clickjacking is a relatively new browser attack which security researchers Robert Hansen and Jeremiah Grossman gave a talk on late last year at the Open Web Application Security Project (OWASP) security conference in New York. The attack broadly fits within the category of cross-site scripting forgery, where an attacker uses maliciously crafted HTML or JavaScript code to force a victim's web browser to send an HTTP request to a website of their choosing.
"Clickjacking means that any interaction you have with a website you're on, for example like clicking on a link, may not do what you expect it to do," explained Herath.
"You may click on a link that looks like it's pointing to a picture on Flickr, but in reality, it might first direct you to a drive-by-download server that serves malware. These types of attacks can be used to make you interact with web services you're already logged onto in ways that you would never want to, without you even knowing that it has happened."
The NoScript plugin for Firefox protects from clickjacking. See
http://noscript.net/faq#clearclick
and
http://hackademix.net/2008/10/08/hello-clearclick-goodbye-clickjacking/