Microsoft Internet Explorer Bug in Firefox URL Protocol Handler Lets Remote Users Execute Arbitrary Commands
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SecurityTracker Alert ID: 1018351 |
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SecurityTracker URL: http://securitytracker.com/id/1018351
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CVE Reference:
CVE-2007-3670
(Links to External Site)
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Updated: May 6 2008
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Original Entry Date: Jul 10 2007
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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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:
http://larholm.com/2007/07/10/internet-explorer-0day-exploit/
[Editor's note: Some users report that this is not a vulnerability in Internet Explorer and that, instead, Mozilla Firefox is vulnerable.]
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Impact:
A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.
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Solution:
No solution was available at the time of this entry.
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Vendor URL: www.microsoft.com/ (Links to External Site)
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Cause:
Input validation error
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Underlying OS:
Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Tue, 10 Jul 2007 07:09:23 +0200
Subject: [Full-disclosure] Internet Explorer 0day exploit
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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
http://larholm.com/2007/07/10/internet-explorer-0day-exploit/
Cheers
Thor Larholm
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