From: Robert E. Lee (robert@outpost24.com)
Date: Thu Jul 27 2006 - 06:46:25 EDT
On Thu, 27 Jul 2006 09:33:50 +0800
"Rick Zhong" <sagiko@gmail.com> wrote:
> My question is if the user inputs are not displayed to any other users
> ANYWHERE in the application, what's the impact of this XSS
> vulnerability? Or are we still consider this as an XSS vulnerability?
> Can malicious intruders still take advantage of this?
Yes, it is still considered XSS by many (most?). It's usually only a real problem if the XSS is exploitable pre-authentication. If it is a pre-auth XSS, an attacker can use a phishing scenario to collect valid login credentials. This attack is greatly aided when the site also has SSL, as the user will be able to verify that they are indeed talking to https://www.theirrealbank.com... but the content of the page will be controlled by the attacker through the pre-auth XSS.
There are likely other bad scenarios, but that's the one I usually think of when I see it.
Robert
-- Robert E. Lee Chief Security Officer http://www.outpost24.com phone: (949) 394-2033 fax : +46-(0)455-13960 email: robert@outpost24.com ------------------------------------------------------------------------------ This List Sponsored by: Cenzic Concerned about Web Application Security? Why not go with the #1 solution - Cenzic, the only one to win the Analyst's Choice Award from eWeek. As attacks through web applications continue to rise, you need to proactively protect your applications from hackers. Cenzic has the most comprehensive solutions to meet your application security penetration testing and vulnerability management needs. You have an option to go with a managed service (Cenzic ClickToSecure) or an enterprise software (Cenzic Hailstorm). Download FREE whitepaper on how a managed service can help you: http://www.cenzic.com/news_events/wpappsec.php And, now for a limited time we can do a FREE audit for you to confirm your results from other product. Contact us at request@cenzic.com for details. ------------------------------------------------------------------------------
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