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Date: Tue, 23 Jan 2007 00:44:13 -0700
From: Jose Avila III <>
Cc: Jose Avila <>
Subject: Safari Improperly Parses HTML Documents & BlogSpot XSS vulnerability


Safari on occasions may improperly parse the source of an HTML  
document, which can lead to the execution of html tags within  
comments. This can become dangerous when input filters allow html  
tags within comments, as they will get parsed and executed under  
certain circumstances.


In some cases you can cause Appleā€™s Safari browser to execute code  
when it should not be executed. In the following example everything  
within the comment, in theory should never be executed; however,  
safari decides to execute the script tag.

<title>myblog<!--</title></head><body><script src= 
bean.js> --></title>

Blogs hosted on have filter mechanisms for their input;  
however, they will allow you to inject anything within comments. This  
made it possible to cross site script Note: Only Safari  
viewers will be affected.

Proof of concept:

Initial release of vulnerability: 

Vendor Response:

I was unable to get a response from the vendor in regards to this issue

Questions / Comments:
Jose (at) onzra (dot) com

Register for my RSA 2007 Training Course
"Creative Web Protocol Attacks, Beyond Web Hacking"
February 4, 5 2007 San Francisco

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