News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Chris Shiflett's Blog:
Google XSS and Evil Character Encoding
December 22, 2005 @ 06:19:39

On his blog today, Chris Shiflett has two posts about a problem with Google and a Cross-site Scripting attack that it's vulnerable to.

From this post: The recent cross-site scripting (XSS) vulnerability discovered in Google perfectly illustrates why character encoding matters. This example demonstrates how to use PHP's htmlentities() with the optional third argument that indicates the character encoding.

By way of demonstration, he provides a little PHP script that makes a request in a different character encoding than Google can handle. Coupled with the small response from Google, a UTF-7 character sent to certain browsers could be interpreted and executed.

In this second post, he answers a question from the comments - "how will this effect my site?"

Rather than offer another vague answer, I decided to provide a very simple proof of concept that demonstrates how character encoding inconsistencies can bite you. Google's vulnerability has of course been fixed, but with a simple PHP script, we can reproduce the situation.

The script, though escaped, still causes a Javascript popup box to show when the page is loaded - all due to a lack of improper character encoding handling...

0 comments voice your opinion now!
shiflett google xss character encoding shiflett google xss character encoding


blog comments powered by Disqus

Similar Posts

Rudy Nappee's Blog: The harest week (GSoC Docbook Renderer)

PHPImpact Blog: The PHP framework that fits in a tweet!

John Cox\'s Blog: Security Blunders

Evert Pot's Blog: Filesystem encoding and PHP

Community News: phpAspect Project Revived


Community Events





Don't see your event here?
Let us know!


community unittest release configure developer install series threedevsandamaybe introduction framework laravel language api interview library code wordpress list application podcast

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework