Bug 149930

Summary: CAN-2005-0586 Download dialog spoofing using Content-Disposition header
Product: Red Hat Enterprise Linux 4 Reporter: Josh Bressers <bressers>
Component: firefoxAssignee: Christopher Aillon <caillon>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0Keywords: Security
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Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,public=20050224
Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2005-03-01 19:02:05 UTC Type: ---
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Description Josh Bressers 2005-02-28 20:55:13 UTC 
Andreas Sanblad of Secunia Research demonstrated a method to spoof the download
dialog for saving files by supplying a Content-Disposition header with a
different extension than the extension visible in the link and download dialog.
Users could be tricked into downloading a safe-looking file such as a JPEG image
and have it actually be saved with an executable extension.

Windows hides file extensions by default. If the user did not notice the
incorrect icon they might at some later time double-click on the saved file and
execute it instead of having it open in the expected media application. 

http://www.mozilla.org/security/announce/mfsa2005-22.html
Comment 1 Josh Bressers 2005-03-01 19:02:05 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-176.html