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Big enterprises thanks us for our work to help secure their web applications. Even large software development companies have problems with web security, and Sitewatch has the solution for you company the secure you webapplication.
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Sitewatch is helping the world of web applications to be more secure and safe. One of the vulnerability we found and are famous for is CVE-2011-0049, which is in the top 500 most dangerous vulnerabilities of all time.
I am happy to announce that Sitewatch is on the Google Security Hall of fame for two periods in a row! There are 5 others that also accomplished this same feet. I am curious what the next period will hold. I know one thing for sure, Sitewatch will be on the Hall of Fame next period.
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Sitewatch has uncovered 16 reflective XSS vulnerablites affecting various wordperss themes. Some of these themes are available to wordpress.com users, which negatively impacts this service. Wordpress themes are vulnerable to XSS because the platform doesn’t enforce security. Drupal on the other hand tries to be secure by default although this isn’t perfect I think this is a much better approach to security. You can’t assume developers on your platform are gong to understand all of the strange rules for XSS, so Sitewatch is trying to help. If you look at the PoC’s you’ll see common XSS vectors include $_SERVER[‘PHP_SELF’] and XSS in dom events. The DOM event based XSS is interesting, in my recent paper Bypassing IE’s XSS filter I showed that IE doesn’t protect its DOM events from XSS, so these attacks will just work without modification.
By default Internet Explorer 9 has a security system to help prevent Reflective XSS attacks. There are well known shortfalls of this system, most notably that it does not attempt to address DOM based XSS or Stored XSS. This security system is built on an arbitrary philosophy which only accounts for the most straight forward of reflective XSS attacks. This paper is covering three attack patterns that undermine Internet Explorer’s ability to prevent Reflective XSS. These are general attack patterns that are independent of Web Application platform.
XSS is not an input validation problem, its an output validation problem. If you perform the same input validation on all input indiscriminately you’ll still have problems with XSS. For instance if you encode or strip all greaterthan < and lessthan > characters for every input variable you can still have problems with XSS. This is because XSS is highly dependent on where the variable is being printed to the page.
But here is the real kicker, even this function can’t stop ALL XSS. You can still run into problems with DOM based xss and XSS via event handlers.
This is becuase the variable will go though a decoding process by the browser before it is executed.
However, even if the quote marks are encoded using html encoding. The browser will perform an HTML Decode prior to executing the onclick event. There for the following alert(123) will be executed!
This is due to the fact that the browser interprates this code as:
So whats the real solution? Test your code! Use a free vulnerability scanning service like Sitewatch!