Re: Odd XSS Exploit

["kevin horvath" <kevin.horvath () gmail com>]

This is not related to XSS but to input validation.  It looks like it
doesn't know what to do with the %27 which is a ' mark.  Since its a
username field and it doesn't like the ' mark you should look more at
sql injection and the logic processing of the application.

On Sat, May 3, 2008 at 1:02 AM, arvind doraiswamy
<arvind.doraiswamy () gmail com> wrote:
> You want to elaborate a bit more on this? My feel is that the fact
>  that it gave you  a session error back meant that you were already
>  logged in to the application. Then you intrcepted or somehow did the
>  XSS bit upon which the app detected you had messed around with the
>  variables and threw you out. You then killed Firefox which should have
>  destroyed the session as well but for some reason did not. Most
>  probably because there is some kind of "remember me " feature in the
>  application which is storing session state somewhere(maybe a cookie??)
>  or the page what you see is cached and there's no real connection
>  happening to the server when you go to that page again. This sounds
>  possible as well because a "logged in user" page if it has static
>  content might not change and is cached. That is a problem but its not
>  an XSS problem.
>
>  If I've misunderstood please post back.
>
>  Cheers
>  Arvind
>
>  On Thu, May 1, 2008 at 7:59 AM,  <guinness.stout () gmail com> wrote:
>  > I was hoping someone could shed some light on this odd XSS
>  >
>  >  vulnerability I uncovered while doing a pentest for a client.  The
>  >
>  >  site is a customer portal and when the below XSS is executed nothing
>  >
>  >  happens.  Basically gives a session error back, nothing interesting
>  >
>  >  there.  But when you kill -9 or End Process on FireFox then reopen
>  >
>  >  with "Restore Session" the site comes back up to the XSS but dumps
>  >
>  >  logged in users information.
>  >
>  >
>  >  I cannot replicate this in other browsers nor with Paros, webscarab, SPIKE etc.
>  >
>  >
>  >  
> https://host/portal/j_acegi_security_check?j_username=%27%3Cscript%3Ealert%28%27xss%27%29%3C%2Fscript%3E&j_password=d&login=Login
>  >
>  >
>  >  -Chris
>  >
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