[NT] BadBlue 302 Status Message XSS

From: support@securiteam.com
Date: 07/22/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 22 Jul 2002 22:06:59 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  BadBlue 302 Status Message XSS
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SUMMARY

BadBlue is susceptible to a cross-site scripting attack in its HTTP
Redirection response. The attack would allow attackers to present data as
if it was sent from the server (HTML and JavaScript content).

DETAILS

Vulnerable systems:
 * BadBlue version 1.74

When BadBlue is passed a name of a non-existent file path (or an existent
folder) that does not end in a 0x2F, character ("/") it returns a
302-status code containing some text:

HTTP/1.0 302 found
Location: /<SCRIPT>/

<html><body><pre>GET /<SCRIPT> HTTP/1.0

Obviously, if you pass in HTML markup, it continues into the reply
un-filtered, resulting in a cross-site scripting attack.

This vulnerability cannot be exploited on Internet Explorer, or any
browser that ignores entities in HTTP redirect messages.

Successful exploitation may require a significant amount of "garbage"
HTML, as the entity is downloaded, displayed, and then the redirect
executed. This vulnerability poses minimal risk, but should be taken very
seriously.

ADDITIONAL INFORMATION

The information has been provided by <mailto:mattmurphy@kc.rr.com>
Matthew Murphy.

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