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Category:   Application (Web Browser)  >   Microsoft Internet Explorer Vendors:   Microsoft
Microsoft Internet Explorer Bug in Firefox URL Protocol Handler Lets Remote Users Execute Arbitrary Commands
SecurityTracker Alert ID:  1018351
SecurityTracker URL:
CVE Reference:   CVE-2007-3670   (Links to External Site)
Updated:  May 6 2008
Original Entry Date:  Jul 10 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Microsoft Internet Explorer. A remote user can cause arbitrary commands to be executed on the target user's system.

The browser does not properly process the 'FirefoxURL' URL protocol. A remote user can create specially crafted HTML that, when loaded by the target user, will execute arbitrary shell commands with arbitrary arguments on the target system. The commands will run with the privileges of the target user.

The protocol handler for the FirefoxURL protocol will pass the user-supplied command and arguments to ShellExecute().

Thor Larholm discovered this vulnerability.

The original advisory is available at:

[Editor's note: Some users report that this is not a vulnerability in Internet Explorer and that, instead, Mozilla Firefox is vulnerable.]

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  [Full-disclosure] Internet Explorer 0day exploit

There is a URL protocol handler command injection vulnerability in 
Internet Explorer for Windows that allows you to execute shell commands 
with arbitrary arguments. This vulnerability can be triggered without 
user interaction simply by visiting a webpage.

When Internet Explorer encounters a reference to content inside a 
registered URL protocol handler scheme it calls ShellExecute with the 
EXE image path and passes the entire request URI without any input 
validation. For the sake of demonstration I have constructed an exploit 
that bounces through Firefox via the FirefoxURL protocol handler. The 
full advisory and a working Proof of Concept exploit can be found at

Thor Larholm

Full-Disclosure - We believe in it.
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