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SNS Advisory 79

SNS Advisory 79
Posted Nov 20, 2004
Authored by Keigo Yamazaki, Little eArth Corporation | Site lac.co.jp

SNS Advisory 79 - Microsoft Internet Explorer contains a vulnerability that could cause a Cookie to be overwritten under certain conditions. Tested against Microsoft Internet Explorer 6.0 Service Pack 1.

tags | advisory
SHA-256 | f8e8e031b29edfbd8f4c1c957c970be213c8034091cdd7faf4b2a53d38a67228

SNS Advisory 79

Change Mirror Download


----------------------------------------------------------------------
SNS Advisory No.79
A Possibility of Cookie Overwrite in Microsoft Internet Explorer

Problem first discovered on: Mon, 01 Sept 2003
Published on: Mon, 15 Nov 2004
----------------------------------------------------------------------

Severity Level:
---------------
Low


Overview:
---------
Microsoft Internet Explorer contains a vulnerability that could cause a
Cookie to be overwritten under certain conditions.


Problem Description:
--------------------
Microsoft Internet Explorer fails to check certain character strings
when accepting cookies.

If Internet Explorer accepts a cookie with a crafted Path attribute,
it becomes possible to overwrite a cookie issued by another site under
specific conditions.

[Preconditions for the exploit]
1. If the target domain name contains the attacker's domain name,
or if the target IP address contains the attacker's IP address

2. If the target site is running a Web service on a wildcard domain

Exploitation therefore, could make it possible for attackers to hijack
Web sessions and login as legitimate users.


Tested Versions:
----------------
Microsoft Internet Explorer 6.0 Service Pack 1


Solution:
---------
If you use Windows XP, apply Service Pack 2.
Or as an alternative workaround, change the configuration as follows:

1. When accepting a cookie, please set to prompt a dialog in [Internet Options].

1) Go to [Privacy] -> [Advanced]

2) In the "Cookies" section, check the "Override automatic cookie
handling" checkbox.

3) Under First-party Cookies, select [Prompt]

4) Click [OK]

2. Please choose [Block Cookie] to cancel cookies that do not start with "/".


Discovered by:
--------------
Keigo Yamazaki


Acknowledgements:
-----------------
Microsoft Co., Ltd


Disclaimer:
-----------
The information contained in this advisory may be revised without prior
notice and is provided as it is. Users shall take their own risk when
taking any actions following reading this advisory. LAC Co., Ltd.
shall take no responsibility for any problems, loss or damage caused
by, or by the use of information provided here.

This advisory can be found at the following URL:
http://www.lac.co.jp/business/sns/intelligence/SNSadvisory_e/79_e.html

------------------------------------------------------------------
Secure Net Service(SNS) Security Advisory <snsadv@lac.co.jp>
Computer Security Laboratory, LAC http://www.lac.co.jp/security/

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