Microsoft Outlook Express Spoofable File Extensions Vulnerability

Bugtraq ID:	5277
Class:	Design Error
CVE:
Remote:	Yes
Local:	No
Published:	Jul 20 2002 12:00AM
Updated:	Jul 20 2002 12:00AM
Credit:	Vulnerability discovery credited to Matthew Murphy <[email protected]>.
Vulnerable:	Microsoft Outlook Express 6.0 + Microsoft Windows Server 2003 Datacenter Edition + Microsoft Windows Server 2003 Datacenter Edition + Microsoft Windows Server 2003 Datacenter Edition + Microsoft Windows Server 2003 Datacenter Edition Itanium 0 + Microsoft Windows Server 2003 Datacenter Edition Itanium 0 + Microsoft Windows Server 2003 Datacenter Edition Itanium 0 + Microsoft Windows Server 2003 Enterprise Edition + Microsoft Windows Server 2003 Enterprise Edition + Microsoft Windows Server 2003 Enterprise Edition + Microsoft Windows Server 2003 Enterprise Edition Itanium 0 + Microsoft Windows Server 2003 Enterprise Edition Itanium 0 + Microsoft Windows Server 2003 Enterprise Edition Itanium 0 + Microsoft Windows Server 2003 Itanium SP2 + Microsoft Windows Server 2003 Itanium SP2 + Microsoft Windows Server 2003 Itanium SP1 + Microsoft Windows Server 2003 Itanium SP1 + Microsoft Windows Server 2003 Standard Edition + Microsoft Windows Server 2003 Standard Edition + Microsoft Windows Server 2003 Standard Edition + Microsoft Windows Server 2003 Standard x64 Edition + Microsoft Windows Server 2003 Standard x64 Edition + Microsoft Windows Server 2003 Web Edition + Microsoft Windows Server 2003 Web Edition + Microsoft Windows Server 2003 Web Edition + Microsoft Windows Server 2003 x64 SP2 + Microsoft Windows Server 2003 x64 SP2 + Microsoft Windows XP 64-bit Edition + Microsoft Windows XP 64-bit Edition + Microsoft Windows XP Home + Microsoft Windows XP Home + Microsoft Windows XP Home + Microsoft Windows XP Media Center Edition SP2 + Microsoft Windows XP Media Center Edition SP2 + Microsoft Windows XP Media Center Edition + Microsoft Windows XP Media Center Edition + Microsoft Windows XP Media Center Edition + Microsoft Windows XP Professional + Microsoft Windows XP Professional + Microsoft Windows XP Professional + Microsoft Windows XP Professional x64 Edition SP2 + Microsoft Windows XP Professional x64 Edition SP2 + Microsoft Windows XP Tablet PC Edition SP2 + Microsoft Windows XP Tablet PC Edition SP2 + Microsoft Windows XP Tablet PC Edition + Microsoft Windows XP Tablet PC Edition Microsoft Outlook Express 5.5 + Microsoft Internet Explorer 5.0.1 for Windows NT 4.0 + Microsoft Internet Explorer 5.0.1 for Windows NT 4.0 + Microsoft Internet Explorer 5.0.1 for Windows 98 + Microsoft Internet Explorer 5.0.1 for Windows 98 + Microsoft Internet Explorer 5.0.1 for Windows 95 + Microsoft Internet Explorer 5.0.1 for Windows 95 + Microsoft Internet Explorer 5.0.1 for Windows 2000 + Microsoft Internet Explorer 5.0.1 for Windows 2000 + Microsoft Internet Explorer 5.0.1 + Microsoft Internet Explorer 5.0.1 + Microsoft Internet Explorer 5.5 + Microsoft Internet Explorer 5.5 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows 95 - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows 98 - Microsoft Windows 98SE - Microsoft Windows 98SE - Microsoft Windows NT 4.0 - Microsoft Windows NT 4.0 Microsoft Outlook Express 5.0
Not Vulnerable:

Microsoft Outlook Express Spoofable File Extensions Vulnerability

It is possible for a malicious user, sending email via a mail agent capable of manipulating the MIME headers, to spoof file extensions for users of Outlook Express. For example, an .exe file can be made to look like a .txt (or other seemingly harmless file type) file in the attachment list.

When including a certain string of characters between the filename and the actual file extension, Outlook Express will display the specified misleading file extension type.

The end result is that an attacker is able to entice a user to open or save files of arbitrary types to their local system.

Microsoft Outlook Express Spoofable File Extensions Vulnerability

The following example was made available by Matthew Murphy <[email protected]>:

• /data/vulnerabilities/exploits/Oe6_issues.eml

Microsoft Outlook Express Spoofable File Extensions Vulnerability

Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Microsoft Outlook Express Spoofable File Extensions Vulnerability

References: