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Category:   Application (Web Browser)  >   Microsoft Internet Explorer Vendors:   Microsoft
Microsoft Internet Explorer Bug in Setting Cookies in Certain Domains May Let Remote Users Conduct Session Fixation Attacks
SecurityTracker Alert ID:  1011332
SecurityTracker URL:
CVE Reference:   CAN-2004-0866, CAN-2004-0868, CAN-2004-0869   (Links to External Site)
Updated:  Sep 26 2004
Original Entry Date:  Sep 16 2004
Impact:   Modification of user information
Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 6.0
Description:   A vulnerabiltiy was reported in Microsoft Internet Explorer (IE). A remote user may be able to set cookies on certain domains as part of a session fixation attack.

Westpoint Security reported that a remote web server can set a cookie on the target user's IE browser for certain country specific top-level domains (TLDs) to cause IE to send the cookies when connecting to any other web servers in the same domain.

Any country specific TLDs that have more than 2 characters in secondary portion of the domain name are affected, except those that use com, net, mil, org, gov, edu, or int. The report notes that '', '', '', '', '', and '' are examples of affected domains.

This flaw may allow remote users to conduct session fixation attacks to hijack a target user's session. A paper on session fixation attacks is available at:

It is also reported that the browser may send non-secure cookies (i.e., those set via HTTP) to the server via SSL. A remote user with the ability to spoof connections or conduct a man-in-the-middle attack may be able to set a cookie on the target user's browser that will subsequently be sent by the target user's browser to a secure server as part of a session fixation attack.

The vendor was notified on July 20, 2004.

The original advisory is available at:

Impact:   A remote user may be able to set cookies in certain top-level domains to be sent by the target user's browser when connecting to any server in that domain.

A remote user may be able to set cookies via a non-secure server to be sent by the target user's browser to a secure server.

Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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