Vulnerabilities / Threats
6/28/2013
09:27 AM
Connect Directly
RSS
E-Mail
50%
50%

IE, Chrome Browser Attack Exploits Windows PCs

Microsoft says the social-engineering vulnerability, which uses "pop-under" browser notifications and a fake Captcha, isn't a Windows bug.

Warning: Browser security notification mechanisms can be abused by attackers to hide downloads, dismiss notifications and disguise malicious code execution.

Details of those vulnerabilities were recently presented by independent security researcher Rosario Valotta in a presentation titled "Abusing Browser User Interfaces for Fun and Profit" at last week's Nuit du Hack conference at Disneyland Paris, as well as other recent conferences in Amsterdam and Moscow.

Using the detailed vulnerabilities to create a related exploit is "ridiculously simple," and can be initiated "without any notification or user confirmation," Valotta said in a blog post. "All you need is to type one key on Internet Explorer or make one click on Google Chrome" for the exploit to succeed.

The detailed vulnerabilities begin with modern browsers using modeless notifications to alert users to such events as file downloads, plug-in installations or authorizing HTML5 privileged APIs. "These notifications bars are non-invasive, they are designed ... to inform users without interrupting navigation, but they suffer from some serious design problems," Valotta said.

[ Want to know which security practices give the best bang for your buck? Read Security ROI: 5 Practices Analyzed. ]

Notably, such notifications appear only in the related window or tab that generated them. "So if you are able to 'hide' the navigation window, you can hide also the notification, this means you can [as an example] download a file on your computer and have no notification at all from your browser," he said. In addition, even though these windows might be hidden, the notification is active, meaning that the screen will accept a keyboard shortcut -- for example to save a file or run a file.

Here's Valotta's attack scenario: A user visits a malicious website, which opens a pop-under window and begins downloading a malicious file. Pop-under windows -- they appear behind the active window -- can be created using JavaScript, for example via the cross-browser tool js-popunder, which is available for free from GitHub.

Getting that malicious file to execute, however, requires a bit of trickery, which is also known as social engineering. With Internet Explorer, for example, a user would have to be tricked into typing a required key -- "r" on English-language systems, to make a downloaded file run, or "e" on Italian systems, and so on -- which would in fact be transmitting the keystroke to the hidden, but active, pop-under window.

How might this be accomplished? "Well, there are plenty of ways: a game, a typing lesson," said Valotta. "But my favorite one is a Captcha. Just take a fake Captcha starting with the proper letter ("r" or "e") and you'll get 100% of tricked users."

While a letter must be typed to complete the exploit via IE, for Chrome browsers the requirement -- after the file has been downloaded -- is different. "You need to trick the victim into clicking on some link/button on the foreground window," said Valotta. "The attacker, using some [JavaScript], is able to track mouse pointer coordinates so -- as soon the mouse is hovering on the button -- the attacker can close the foreground window." Obviously, attackers would need to get their timing right.

Previous
1 of 2
Next
Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
moarsauce123
50%
50%
moarsauce123,
User Rank: Apprentice
6/29/2013 | 5:55:50 PM
re: IE, Chrome Browser Attack Exploits Windows PCs
This is clearly a browser bug. As soon as a notification gets shown the window needs to be active and in the front. But is easier to blame others than fix the own flaws.
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Dark Reading, September 16, 2014
Malicious software is morphing to be more targeted, stealthy, and destructive. Are you prepared to stop it?
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-4973
Published: 2014-09-23
The ESET Personal Firewall NDIS filter (EpFwNdis.sys) driver in the Firewall Module Build 1183 (20140214) and earlier in ESET Smart Security and ESET Endpoint Security products 5.0 through 7.0 allows local users to gain privileges via a crafted argument to a 0x830020CC IOCTL call.

CVE-2014-5392
Published: 2014-09-23
XML External Entity (XXE) vulnerability in JobScheduler before 1.6.4246 and 7.x before 1.7.4241 allows remote attackers to cause a denial of service and read arbitrary files or directories via a request containing an XML external entity declaration in conjunction with an entity reference.

CVE-2014-6646
Published: 2014-09-23
The bellyhoodcom (aka com.tapatalk.bellyhoodcom) application 3.4.23 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

CVE-2014-6647
Published: 2014-09-23
The ElForro.com (aka com.tapatalk.elforrocom) application 2.4.3.10 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

CVE-2014-6648
Published: 2014-09-23
The iPhone4.TW (aka com.tapatalk.iPhone4TWforums) application 3.3.20 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Best of the Web
Dark Reading Radio