Skip to main content

Hi ClearClick! Good bye Clickjacking?


Javascript is not necessarily needed to execute Clickjacking.JavaScript might make the attacker’s life easier, but it’s not inevitable to make the attack. Alternatively the attacker can use frame tags to load any site of their choice in the background and using another div tag redirect the user to any other site of choice. No role of Javascript here. Mitigation? Don't load frame in your browser in any case. all it takes is including this piece of javascript in your page:


This works in most browsers, with Internet Explorer being a notable exception.
IE8 comes with another new technique.The fix is actually very simple: it lets website owners include an extra tag in their pages that tells Internet Explorer the page is not supposed to be included in a frame. It’s called X-FRAME-OPTIONS;
a value of DENY means the page should never be opened in a frame, and
SAMEORIGIN only allows it to be framed within pages from the same site.
Any other use will show a warning, and a link that opens the page in a
new screen.
There are efforts to make Firefox too compatible to it .

But for the time being, Firefox users can use the a plug in ClearClick by NoScript.
Default protections that NoScript has provided for a long time, i.e. JavaScript and plugin blocking can prevent most clickjacking attacks. In older version, though, to be 100% protected against Clickjacking you needed to enable the Forbid IFRAME and possibly Apply these restrictions to trusted sites as well NoScript options.
Fortunately, since version 1.8.2, NoScript provides a new default kind of protection called ClearClick, which defeats clickjacking no matter if you block frames or not . Even better, ClearClick can protect you from Clickjacking / UI-redressing attack independently from JavaScript and plugins blocking: you can even Allow scripts globally (which is not recommended anyway), and your ClearClick still works.

Clickjacking hides or displaces or partially covers something you wouldn't want to click, if you could see it in its original context. ClearClick does the opposite: whenever you click a plugin object or a framed page, it takes a screenshot of it alone and opaque (i.e. an image of it with no transparencies and no overlaying objects), then compares it with a screenshot of the parent page as you can see it. If the two images differ, a clickjacking attack is probably happening and NoScript raises a "ClearClick warning",

Comments

Post a Comment

Popular posts from this blog

Using an AirPcap device in Windows with Wireshark

Capturing wireless traffic in a Windows environment is unfortunately not as easy as a setting change. As with most Windows-based software, drivers in Windows are often not open source and do not allow for configuration change into monitor mode. With this in mind, we must use a specialized piece of hardware known as an AirPcap device. Once you have obtained an AirPcap device you will be required to install the software on the accompanying CD to your analysis computer. The configurable options include: • Interface - Select the device you are using for your capture here. Some advanced analysis scenarios may require you to use more than one AirPcap device to sniff simultaneously on multiple channels. • Blink LED - Clicking this button will make the LED lights on the AirPcap device blink. This is primarily used to identify the specific adapter you are using if you are using multiple AirPcap devices. • Channel - In this field, you select the channel you want AirPcap to listen on. Extension C...
5 comments
Read more

Some one watching where you visited!

Yes... Mozilla has been susceptible to browser-history stealing java script code. Today, Giorgio posted some cool information about the exploit. Mozilla is already working on this. This bug has been reported. Actually they have set up a web site to show the proof-of-concept. Visit www.statrpanic.com in FF,Safari or Netscape and it will tell you which websites have you been already ! But I am not sure it will work in IE or not because my IE is not responding to the website. Clearing history of visited website makes you safe to this attack. I mean this is one way..may be there are other ways to exploit this. But I have found this effective. Try it yourself in FF and then in IE and see the results.
Post a Comment
Read more

Hijacking SSL

SSL has been in centerstage of researches as well as attacks for quite long time. Last year in a conference in Germany researchers showed how to generate duplicate certificates exploiting MD5 hashing to break SSL. Later in Black Hat, Maxie showed how to exploit a field in SSL certificates to sign an own forged certificate to present it to the client. The main feature of this attack was that the client will never get any warning dialog box by the browser and subsequently the hacker doing an MITM can see the conversation between the client and server. The client will even get a PADLOCK sign to be assured that all things are going via encryption, but in reality it's not. Maxie released a tool SSLStrip to carry out these attacks. The tool has been used by many researchers around the world to carry out the attacks. They all used Unix machines as many open source utilities makes it easier to run the tool on it. My attempt was to run the tool on a Windows machine. It has been never easy t...
4 comments
Read more