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Microsoft Outlook Express EML file Crash vuln
Microsoft Outlook Express EML file Crash vulnerability

Microsoft Outlook Express EML file Crash vulnerability


Title:     Microsoft Outlook Express EML file Crash vulnerability

HappyName: Who Send?

Date:      Sunday, April 11, 2004

Software:  Outlook Express 6.0 (i guess perior versions are vulnerable too)

Vendor:    Microsoft Corporation

Patch:     N/A (Look at "Vendor Status" section)

Author:    Arman Nayyeri, arman-n[at], 

Severity:  Low (High if exploitable)



The OE crashes when we open an EML file that contains "Sender: some chars" and does

not have "From:" or have an empty one ("From: ").

When I found this, I think that it's a buffer overflow, but after notifing microsoft

they tell me that it's an invalid data pointer and not a buffer overflow and does

not appear exploitable.

I don't know how I can be sure that it's not exploitable, but if you can find it

exploitable post a message in BUGTRAQ.

This exploit is also possible through email, but the user must double click email

and in some conditions it is not possible because the From field will be added/filled

automatically by some servers.



The exploit that I provided is an small EML file with "Sender:" and without

"From:", so it will crash OE.

Download and run eml file until it crashes.

Here is the zip file containing .eml file: 

please, take a look at my website too! 

Exploit Tested On


Outlook Express 6.0


			Microsoft Windows XP

			Microsoft Windows XP SP1

			Microsoft Windows 2003 Enterprise

Vendor Status


Microsoft notified about 3 month ago.

The bug will be fixed as part of the next possible service pack.

Special Thanks


Special thanks to god.

Do I discover more vulnerabilities?


take it easy! however I'm trying to do!



Arman Nayyeri is not responsible for the misuse of the information 

provided in this advisory. The opinions expressed are my own and not of 

any company. In no event shall the author be liable for any damages 

whatsoever arising out of or in connection with the use or spread of this 

advisory. Any use of the information is at the user's own risk.


and sorry for my bad english,

Arman Nayyeri



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