bugtraq - Invalid ContentType may disclose cache directory

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Date: 25 Nov 2003 10:02:42 -0000
From: Liu Die Yu <liudieyuinchina@...oo.com.cn>
To: bugtraq@...urityfocus.com
Subject: Invalid ContentType may disclose cache directory

Invalid ContentType may disclose cache directory

[tested]
OS:WinXp, CN version
Microsoft Internet Explorer v6.Sp1; up-to-date on 2003/11/16

[overview]
The problem lies in the download function of Internet Explorer. This can be exploited by malicious web pages to get cache directory including random names.

[demo]
There are two harmless demos:
1st, online demo, powered by ASP:
http://www.safecenter.net/UMBRELLAWEBV4/threadid10008/threadid10008-Demo
2nd, demo in ZIP format, powered by NETCAT:
http://www.safecenter.net/UMBRELLAWEBV4/threadid10008/threadid10008-Demo.zip

[technical details]
When CONTENTTYPE in HTTP response is invalid and file extension is "HTM", the downloaded HTM file will be opened in cache directory, in INTERNET security zone.

In the 1st demo, this is done by the following ASP code:
----------
response.ContentType = "whocares"
response.AddHeader "content-disposition", "inline; filename=test.htm"
----------

In the 2nd demo, this is done with the help of NETCAT.

[Workaround]
Disable Active Scripting in INTERNET zone, so HTML page opened in the cache can't send information back to the attacker.

[Greetings]
greetings to:
Drew Copley, dror, guninski and mkill.

-----
all mentioned resources can always be found at UMBRELLA.MX.TC

[people]
LiuDieyuinchina [N0-@...2m] yahoo.com.cn
UMBRELLA.MX.TC ==> How to contact "Liu Die Yu"

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