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Insecure Library Loading
Not critical

Internet Explorer File Download Error Message Denial of Service Weakness

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Release Date:  2004-06-16    Last Update:  2005-06-22    Views:  52,486

Secunia Advisory SA11868

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

CVE Reference(s):

No CVE references.

Description


Rafel Ivgi has discovered a weakness in Internet Explorer (IE), allowing malicious people to crash a user's browser.

Analysis indicates that the issue is caused due to an error during the construction of a file download error message dialog box like the following:

"Internet Explorer cannot download [file] from [server]"

It is possible to trigger the issue via a specially crafted link like:
<a href=::%7>Link</a>

This causes an incorrect pointer to be passed as argument in a call to "_snwprintf()" instead of the correct pointer to the string: "[file] from [server]". This may result in an access violation, if the pointer refers to an inaccessible memory location, which varies depending on the supplied value after the "%" character.

The problem has been confirmed on a fully patched system with IE 6.0. Other versions may also be affected.

Successful exploitation crashes the browser, if a user is tricked into right clicking the link and choosing "Save Target As...". It is currently not believed that this issue can be exploited for code execution purposes.

NOTE: Secunia would normally not classify a browser crash as a vulnerability nor issue an advisory about it. However, the potential risc of this issue being more severe than currently believed justified for an advisory being issued.


Solution:
The weakness has been silently fixed at some point.

Provided and/or discovered by:
Rafel Ivgi

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: Internet Explorer File Download Error Message Denial of Service Weakness

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