full-disclosure - Cross-Site Scripting Attacks Possible At Multiple Webspace Provid ers

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From: SkyLined at edup.tudelft.nl (Berend-Jan Wever)
Subject: Cross-Site Scripting Attacks Possible At
 Multiple Webspace Provid ers

I thought this was as widely known as the ability to spoof the sender address in emails. Like you said: "The same-origin policy that is used to avoid
cross-frame security violations is completely compromised" because it all comes from the same origin.

Maybe people just don't know, but i've known this since I first learned about browser script security.

Berend-Jan Wever aka SkyLined

http://spoor12.edup.tudelft.nl
  ----- Original Message ----- 
  From: Matthew Murphy 
  To: Vuln-Dev ; SecurITeam News ; Full Disclosure ; BugTraq 
  Sent: Tuesday, August 06, 2002 6:19
  Subject: [Full-Disclosure] Cross-Site Scripting Attacks Possible At Multiple Webspace Provid ers

  Issue: Multiple web space providers are susceptible to script-based origin
  validation attacks.
  Impact: Cookie theft, page manipulation, ...
  Additional Information: http://www.murphy.101main.net/vulns/2002-24.txt

  Many web space providers offer their users web space by way of a
  folder-based URL, something like this:

  http://www.domain.com/community/uid

  An interesting scenario occurs when pages are visited on (commonplace)
  JavaScript-enabled browsers.  The same-origin policy that is used to avoid
  cross-frame security violations is completely compromised, as the only
  difference in these URLs to the browser is folder/virtual paths, not
  sufficient for a same-origin violation.  This vulnerability allows anyone
  who can create a webspace account on the host to manipulate the appearance
  of other hosted sites provided the victim can be coaxed to a page under
  their control.

  This allows for typical cross-domain scripting attacks (stealing cookies,
  reading form data, ...), which could be pretty devastating, as one site
  instantly has access to the guts of a few thousand (million?) others.

  I have confirmed that Terra Lycos' AngelFire service is vulnerable, and also
  Yahoo! Geocities is believed susceptible.  It is very likely that others are
  vulnerable.

  "The reason the mainstream is thought
  of as a stream is because it is
  so shallow."
                       - Author Unknown
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