RE: Microsoft Outlook Express EML file Crash vulnerability

["Kamran Muzaffer" <kmahmed () cyber net pk>]

I guess the realistic likelihood for this vulnerability to be exploited
is too low as most of the mail servers, these days, are
blocking/dropping blank-From-address emails.

-----Original Message-----
From: Arman Nayyeri [mailto:arman-n () Phreaker net] 
Sent: Sunday, April 11, 2004 11:08 AM
To: bugtraq () securityfocus com
Subject: 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]phreaker.net, http://www.4rman.com

Severity:  Low (High if exploitable)





Description:

============

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.





Exploit:

========

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:

http://www.4rman.com/exploits/whosendthis.zip



please, take a look at my website too!

http://www.4rman.com



Exploit Tested On

=================

Outlook Express 6.0

                        on

                        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!



Disclaimer:

===========

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

                From

                        Iran

http://www.4rman.com