Microsoft Internet Explorer Has Another Frame Domain Security Bug That Lets Remote Users View Files or Other Personal Information from a Victim's Computer By Using Malicious VBScripts
SecurityTracker Alert ID: 1003630|
SecurityTracker URL: http://securitytracker.com/id/1003630
(Links to External Site)
Updated: Jun 3 2008|
Original Entry Date: Feb 22 2002
Disclosure of authentication information, Disclosure of system information, Disclosure of user information|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): 5.01, 5.5, 6|
Microsoft reported another frame domain security vulnerability in Internet Explorer (IE). A remote user could view files on the victim's system or could view content that the victim has recently viewed or typed in on other web sites.|
A flaw reportedly exists in how VBScript is handled in IE relating to validating cross-domain access. A remote user can create a web page or HTML-base e-mail message containing VBScripts that, when viewed by another target user, could access files on the target user's host or could capture the contents of other web sites recently visited by the target user.
To access a file, the remote user must know the exact file name and path and the file must be readable by a web browser.
Microsoft assigns this bug a "Moderate" severity rating for Internet and Intranet Systems and a "Critical" rating for Client Systems.
A remote user could view files on another user's host or could view content from a web site that the user has recently visited (potentially including username, password, and credit card data that the user entered to the web site).|
The vendor has released a fix for IE, available at:|
The IE 5.01 patch can reportedly be applied to Windows 2000 Systems with SP2 running IE 5.01. The IE 5.5 patch can reportedly be installed on systems running IE 5.5 SP1 or SP2. The IE 6.0 patch can reportedly be installed on system running IE 6.0 Gold.
According to Microsoft, this fix will also be included in Internet Explorer 6.0 SP1.
Microsoft plans to release Knowledge Base article Q318089 on this topic shortly.
Vendor URL: www.microsoft.com/technet/security/bulletin/MS02-009.asp (Links to External Site)
Access control error|
|Underlying OS: Windows (Any)|
Source Message Contents
Subject: Microsoft Security Bulletin MS02-009|
-----BEGIN PGP SIGNED MESSAGE-----
Title: Incorrect VBScript Handling in IE can Allow Web Pages to
Read Local Files
Date: 21 February 2002
Software: Internet Explorer
Impact: Information Disclosure
Max Risk: Critical
Microsoft encourages customers to review the Security Bulletin at:
Frames are used in Internet Explorer to provide for a fuller
browsing experience. By design, scripts in the frame of one site or
domain should be prohibited from accessing the content of frames
in another site or domain. However, a flaw exists in how VBScript
is handled in IE relating to validating cross-domain access. This
flaw can allow scripts of one domain to access the contents of
another domain in a frame.
A malicious user could exploit this vulnerability by using
scripting to extract the contents of frames in other domains,
then sending that content back to their web site. This would
enable the attacker to view files on the user's local machine
or capture the contents of third-party web sites the user visited
after leaving the attacker's site. The latter scenario could,
in the worst case, enable the attacker to learn personal
information like user names, passwords, or credit card information.
In both cases, the user would either have to go to a site under
the attacker's control or view an HTML email sent by the attacker.
In addition, the attacker would have to know the exact name and
location of any files on the user's system. Further, the attacker
could only gain access to files that can be displayed in a browser
window, such as text files, HTML files, or image files.
- The vulnerability could only be used to view files. It could not
be used to create, delete, modify or execute them.
- The vulnerability would only allow an attacker to read files that
can be opened in a browser window, such as image files, HTML
files and text files. Other file types, such as binary files,
executable files, Word documents, and so forth, could not be read.
- The attacker would need to specify the exact name and location of
the file in order to read it.
- The email-borne attack scenario would be blocked if the user were
using any of the following: Outlook 98 or 2000 with the Outlook
Email Security Update installed; Outlook 2002; or Outlook
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Critical
- A patch is available to fix this vulnerability. Please read the
Security Bulletin at
for information on obtaining this patch.
- Zentai Peter Aron, Ivy Hungary Ltd (http://w3.ivy.hu/)
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-----BEGIN PGP SIGNATURE-----
Version: PGP 7.1
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