Title: Microsoft Internet Explorer Image Download Filename Extension Spoofing Vulnerability
Severity: MODERATE
Description:
Microsoft Internet Explorer is reported susceptible to a filename extension spoofing vulnerability when utilizing the 'Save Image As' feature.
Reportedly, this vulnerability is only possible when Internet Explorer is configured with 'Hide extension for known file types' enabled. This is the default configuration.
Specifically, when attempting to save images, Internet Explorer uses the filename as specified in the URI rather than the one presented to it in the headers in the actual download process. It also reportedly removes the last extension if there are multiple extensions present in the filename.
These two flaws can be combined to cause Internet Explorer to save files to a users filesystem with arbitrary extensions.
This vulnerability may facilitate the spoofing of filename extensions, resulting in malicious content being inadvertently downloaded to vulnerable Web users.
This issue may be related to BID 3597.
Affected Products:
- Microsoft Internet Explorer 5.0
- Microsoft Internet Explorer 5.0 for Windows 2000
- Microsoft Internet Explorer 5.0 for Windows 95
- Microsoft Internet Explorer 5.0 for Windows 98
- Microsoft Internet Explorer 5.0 for Windows NT 4.0
- Microsoft Internet Explorer 5.0.1
- Microsoft Internet Explorer 5.0.1 SP1
- Microsoft Internet Explorer 5.0.1 SP2
- Microsoft Internet Explorer 5.0.1 SP3
- Microsoft Internet Explorer 5.0.1 SP4
- Microsoft Internet Explorer 5.0.1 for Windows 2000
- Microsoft Internet Explorer 5.0.1 for Windows 95
- Microsoft Internet Explorer 5.0.1 for Windows 98
- Microsoft Internet Explorer 5.0.1 for Windows NT 4.0
- Microsoft Internet Explorer 5.5
- Microsoft Internet Explorer 5.5 SP1
- Microsoft Internet Explorer 5.5 SP2
- Microsoft Internet Explorer 5.5.0 preview
- Microsoft Internet Explorer 6.0
- Microsoft Internet Explorer 6.0 SP1
- Microsoft Internet Explorer 6.0 SP2 - do not use
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional SP1
- Microsoft Windows 2000 Professional SP2
- Microsoft Windows 2000 Terminal Services
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows 98SE
- Microsoft Windows ME
- Microsoft Windows NT 4.0
- Microsoft Windows Server 2003 Datacenter Edition
- Microsoft Windows Server 2003 Datacenter Edition Itanium
- Microsoft Windows Server 2003 Enterprise Edition
- Microsoft Windows Server 2003 Enterprise Edition Itanium
- Microsoft Windows Server 2003 Standard Edition
- Microsoft Windows Server 2003 Web Edition
- Microsoft Windows XP Home
- Microsoft Windows XP Professional
References:
- Microsoft: Right-Clicking, Selecting 'Save Picture As' Does Not Save Image with Correct Ext
- Mozilla: Mozilla Firefox Home Page
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