Moderately critical

Microsoft Internet Explorer Local File Disclosure Vulnerabilities

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Release Date:  2010-02-04    Last Update:  2010-06-10    Views:  59,561

Secunia Advisory SA38416

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Description


Two vulnerabilities have been reported in Internet Explorer, which can be exploited by malicious people to disclose sensitive information


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Subject: Microsoft Internet Explorer Local File Disclosure Vulnerabilities

User Message
palisade RE: Microsoft Internet Explorer Local File Disclosure Vulnerabilities
Member 31st Mar, 2010 15:07
Score: 37
Posts: 16
User Since: 26th Feb 2010
System Score: N/A
Location: US
Last edited on 31st Mar, 2010 15:07
I attempted to run the exploit sample for #2:
<script language="Javascript">
var obj = document.createElement("object");
obj.data = "file://127.0.0.1/C$/.../index.dat";
obj.type = "text/html";
obj.id = "obj_results";
obj.width = "500px";
obj.height = "300px";
document.body.appendChild(obj);
</script>

In the latest IE8 post recent patches. The first thing I noticed is that I receive this message preventing the script:
"To help protect your security, Internet Explorer has restricted this webpage from running scripts or ActiveX controls that could access your computer. Click here for options..."

The second thing that I noticed is then when I allowed the script to run, it did not display any data as it was suggested it would. Secunia might need to re-test this vulnerability in their labs and see if it is still relevant or not.

I was unable to exploit myself using this vulnerability.

When I ran the vuln in #1, with the code:

<object data="index.dat" type="text/html" width="100%" height="50"></object>

And, again it blocked it, I accepted, and then I received this warning:

Cannot find 'file:///C:/Documents%20and%20Settings/nrush/Deskt op/index.dat'. Make sure the path or Internet address is correct.

So, I created a index.dat on my desktop and typed it worked inside, reloaded, and it worked.

I'm not sure if I just didn't do the #2 vuln correctly and that's why it didn't work, or not. However, vuln #1 is definitely still exploitable.
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Luckyboya RE: Microsoft Internet Explorer Local File Disclosure Vulnerabilities
Member 10th Jul, 2010 23:45
Score: -100
Posts: 3
User Since: 10th Jul 2010
System Score: N/A
Location: AO
Thanks Pallisade for the fantastic analysis. I hope Secunia did double check it because I came to the same conclusion. The script did not display any data as it was suggested it would. I also received the same warning:Cannot find 'file:///C:/Documents%20and%20Settings/nrush/Deskt op/index.dat'. Make sure the path or Internet address is correct. So, I adhere with your conclusion.

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