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Internet Explorer File Download Error Message Denial of Service Weakness
Secunia Advisory: SA11868
Release Date: 2004-06-16
Last Update: 2005-06-22
Popularity: 47,730 views

Critical:
Not critical
Impact: DoS
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft Internet Explorer 6.x

Secunia CVSS-2 Score: Available in Secunia business solutions

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Advisory Content (Page 1 of 3)[ 1 ] [ 2 ] [ 3 ]

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.

Change Page:
[ 1 ] [ 2 ] [ 3 ]



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