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Date: 25 Nov 2003 09:51:13 -0000
From: Liu Die Yu <>
Subject: MHTML Redirection Leads to Downloading EXE and Executing

MHTML Redirection Leads to Downloading EXE and Executing

OS:Win2k3,CN version
IE: with MS03-048 installed.

OS:WinXp, CN version
Microsoft Internet Explorer v6.Sp1; up-to-date on 2003/11/16

A vulnerability in Internet Explorer is found: any attacker that can reach MYCOMPUTER security zone(a.k.a local zone) is able to download his EXE file and execute it.

There is a harmless demo:

[technical details]
There is a feature in Internet Explorer when it tries to retrieve a file embedded in an MHT file, like:
If [Original_Resource_Url] cannot be retrieved from [Mhtml_File_Url], IE will try to download [Original_Resource_Url] and return the downloaded content.

It's like as HTTP redirection.

And CODEBASE execution is a URL-based security check.
(Liu Die Yu's )

So, in MYCOMPUTER security, point CODEBASE property of an OBJECT tag with unused CLSID to:
and then, IE will download [Attaker_PayloadEXE_Url] and execute it.

Disable Active Scripting in INTERNET zone.

greetings to:
Drew Copley, dror, guninski and mkill.

all mentioned resources can always be found at UMBRELLA.MX.TC

LiuDieyuinchina [N0-@...2m]
UMBRELLA.MX.TC ==> How to contact "Liu Die Yu"

A wise man learns from other's mistakes; a fool learns from his own.

I would like to work professionally as a security researcher/bug finder. 

See my resume at my site. I am very eager to work, flexible, and 
extremely productive. I have a top notch resume, with credentials 
from leading bug finders. I am willing to work per contract, relocate, 
or telecommute. 
[Give a Hand]
I haven't got a job as a security researcher yet and my family don't support my security work - so, I don't have a computer of my own. Please consider about donating at:

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