Security Advisory SA38416 - Microsoft Internet Explorer Local File Disclosure Vulnerabilities

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Secunia Advisory SA38416

Microsoft Internet Explorer Local File Disclosure Vulnerabilities

Secunia Advisory

SA38416

Release Date

2010-02-04

Last Update

2010-06-10

Popularity

58,064 views

Comments

2 comments

Criticality level

Moderately critical

Impact

Exposure of system information
Exposure of sensitive information

Where

From remote

Authentication level

This information is available to Secunia VIM customers

Report reliability

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Solution Status

Partial Fix

Systems affected

This information is available to Secunia VIM customers

Approve distribution

This information is available to Secunia VIM customers

Software:

Microsoft Internet Explorer 5.01

Microsoft Internet Explorer 6.x

Microsoft Internet Explorer 7.x

Microsoft Internet Explorer 8.x

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

CVE-2010-0255 CVSS score available to Secunia VIM customers
CVE-2010-0555 CVSS score available to Secunia VIM customers

Description

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

1) An error in URLMON when handling redirections can be exploited to bypass domain restrictions and disclose the content of arbitrary local files.

This is related to vulnerability #1 in:
SA35362

2) An error when handling the "data" parameter of a dynamically created object can be exploited to disclose the content of arbitrary local files.

Successful exploitation of the vulnerabilities requires that the full path to a target file is known prior to the attack.

The vulnerabilities are reported in Internet Explorer 5.01, 6, 7, and 8.

Solution
Apply updates and the recommended workaround.
Further details available to Secunia VIM customers

Provided and/or discovered by
Jorge Luis Álvarez Medina and Federico Muttis, Core Security Technologies

Changelog
Further details available to Secunia VIM customers

Original Advisory
Microsoft:
http://www.microsoft.com/technet/security/advisory/980088.mspx

MS10-035 (982381):
http://www.microsoft.com/technet/security/Bulletin/MS10-035.mspx

Core Security Technologies:
http://www.coresecurity.com/content/internet-explorer-dynamic-object-tag

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Internet Explorer Local File Disclosure Vulnerabilities

User

Message

palisade

RE: Microsoft Internet Explorer Local File Disclosure Vulnerabilities

31st Mar, 2010 15:07

Score: 36
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.

Was this reply relevant?

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Luckyboya

RE: Microsoft Internet Explorer Local File Disclosure Vulnerabilities

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.

--
Don't by a computer you can not throw out of Windows or embellish with Apple!
http://computeropschonen.com/windows-register-verv...

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Secunia Advisory SA38416

Microsoft Internet Explorer Local File Disclosure Vulnerabilities

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