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:
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.
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Subject: Internet Explorer File Download Error Message Denial of Service Weakness
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