[NT] CSS Bug in Browser Testing Script

From: support@securiteam.com
Date: 04/29/02


From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 29 Apr 2002 09:12:44 +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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  CSS Bug in Browser Testing Script
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SUMMARY

A security vulnerability in the browser testing scripts utilized by some
web sites has been found. The vulnerability is a classic cross-site
scripting vulnerability that would allow attackers to insert HTML and
JavaScript code into existing web pages and pose them as though they were
legitimate web pages coming from the site.

DETAILS

The script allows remote JavaScript injection though its "returnto="
option that also might allow directory transversal with Unicode type
characters, (some sites have the returnto parameter in a hidden field)
here is an example:

http://somesite/tests/browsertest.asp?returnto=="JavaScript1.2"><script>alert("DS-Security Knows")</script>

This has the effect as most CSS bugs.

ADDITIONAL INFORMATION

The information has been provided by <mailto:Dcow0130@aol.com> Dcow0130.

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