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AMBrowser Lets Remote Users Spoof Javascript Dialog Boxes
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SecurityTracker Alert ID: 1014314
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SecurityTracker URL: http://securitytracker.com/id?1014314
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jun 28 2005
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Impact: Disclosure of user information, Modification of user information
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Exploit Included: Yes
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Version(s): 2.0.0
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Description: Juha-Matti Laurio reported a vulnerability in AMBrowser. A remote user can spoof Javascript dialog boxes.
The browser displays Javascript dialog boxes without indicating the origin of the dialog box. As a result, a remote user can create
HTML that will display a dialog box that appears to originate from a trusted site.
A demonstration exploit is available at:
http://secunia.com/multiple_browsers_dia
log_origin_vulnerability_test/
The vendor was notified on June 26, 2005.
Jakob Balle of Secunia Research originally discovered
this type of vulnerability, affecting a variety of browsers.
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Impact: A remote user can spoof Javascript dialog boxes.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.ambrowser.com/ (Links to External Site)
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Cause: State error
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Underlying OS: Windows (Any)
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Reported By: Juha-Matti Laurio <juha-matti.laurio@netti.fi>
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Message History:
None.
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Source Message Contents
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Date: Sun, 26 Jun 2005 17:43:54 +0300 (EEST)
From: Juha-Matti Laurio <juha-matti.laurio@netti.fi>
Subject: New AM Browser Dialog Origin Spoofing Vulnerability
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- Description:
The newest AM Browser version 2.0.0, released on 21th June 2005, is
confirmed as affected to new remote type Multiple Browsers Dialog Origin
Vulnerability. Tests was done with Secunia test
page
http://secunia.com/multiple_browsers_dialog_origin_vulnerability_test/ .
- Result:
Result was similar when tested with fully patched Microsoft Internet
Explorer 6.0 (6.0.2800.1106) including cumulative Microsoft June
security update MS05-025. Issue was tested with Microsoft Windows XP
Professional US and default browser settings were in use.
Opened Script Prompt asking 'password' at this test issue doesn't show
the origin url of the dialog box. Internal Pop-up Blocker doesn't
prevent a new dialog box to open. This enables spoofing-type
attacks.
Browser status bar shows the following text for 'Test Now - Left Click
On This Link' link:
http://www.google.com/
Menu setting Tools / Allow Pop-ups (F8) is disabled by default. Menu
setting Enable Smart Pop-up Blocker ('Blocks Popups automatically') is
enabled by default.
When selecting the test link at Secunia's Test Case / Demonstration
page, a JavaScript dialog box (in fact, JScript) was displayed in front
of the Google.com (or localized Google.fi etc.) web site without
information about its origin URL and/or domain name. Typed text was
appeared to generated 'You entered:' JScript dialog box later.
- Technical details:
A dialog box was opened via test-like PHP script, located at
http://www.google.com.secunia.com/tests/origin_spoof.php . This
malicious test-type address was not shown to user, however.
>From the vendor:
"Enhance your Web browsing experience! AM Browser is a powerful Web
browser. It provides many features that make surfing the web more
comfortable and less confusing. It has the ability to open multiple
sites and windows inside a single browser task. This Web browser also
has a Smart Pop-up Blocker - it blocks all the annoying pop-ups
automatically!"
- Solution status:
No solution was available at the time of reporting.
- Software:
AMBrowser.com AM Browser 2.x
(freeware)
- Affected versions:
The vulnerability has been reported in version 2.0.0. Other versions may
also be affected as well. The exact .exe file version checked was
2.0.0.0.
- Vendor:
AMBrowser.com
Vendor Home Page:
http://www.ambrowser.com/
Product Home Page:
http://www.ambrowser.com/
Download link for version tested:
http://www.ambrowser.com/download.htm
OS: Microsoft Windows
CVE reference: N/A
- Solution:
Do not browse untrusted web sites when browsing trusted sites.
The following workarounds are provided and tested by the researcher:
- Check the URL address of a browser window opening new dialog box
titled as 'Explorer User Prompt' and containing text like 'Script
Prompt' etc. in some way. Dialog box title is localized in non-English
language Windows OSs, e.g. 'Explorerin käyttäjäkehote''. If the domain
contains multiple domain suffixes, for example
www.real-address.com.non-real-address.com, use the following workaround
method:
- When typing sensitive information to a Web site password-type dialog
boxes, be sure that this site is a legitimate site.
NOTE: Using multiple domain suffixes may indicate a spoofing attempt.
Examining of the dialog box addressess can be done by View / Source
function etc. In this demonstration page mentioned the JavaScript code
used is the following:
window.open('http://www.google.com.secunia.com/tests/origin_spoof.php' .
Additionally, Microsoft has published a security advisory to help IE (or
software using IE's engine) users to avoid possible spoofing attemps;
located at
http://www.microsoft.com/technet/security/advisory/902333.mspx .
Vendor was contacted on 26th June, 2005 with e-mail. Workarounds were
included to the
report.
Timeline:
22-06-2005 - Workaround information sent to local CERT-FI unit
23-06-2005 - CERT-FI replied, no security advisory about Internet
Explorer or IE based browsers coming
24-06-2005 - Technical details and workarounds provided sent to
Microsoft Security Response Center
24-06-2005 - MSRC replied
25-06-2005 - Vulnerability in AM Browser researched
26-06-2005 - Vendor contacted, workarounds offered to the vendor
26-06-2005 - Security companies and several CERT units contacted
Best regards,
Juha-Matti Laurio, Networksecurity.fi
Security researcher
Finland
http://www.networksecurity.fi
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