full-disclosure - Re: CodeIgniter Global XSS Filtering Bypass Vulnerability

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Message-ID: <2d6724810907271304q5f4d578aj6c4c2a9827fbb7c3@mail.gmail.com>
Date: Mon, 27 Jul 2009 16:04:12 -0400
From: T Biehn <tbiehn@...il.com>
To: "YGN Ethical Hacker Group (http://yehg.net)" <lists@...g.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: CodeIgniter Global XSS Filtering Bypass
	Vulnerability

This is a joke, right?

-Travis

On Mon, Jul 27, 2009 at 11:53 AM, YGN Ethical Hacker Group
(http://yehg.net)<lists@...g.net> wrote:
> ========================================
>
> CodeIgniter Global XSS Filtering Bypass Vulnerability
>
> ========================================
>
> Discovered by:
> Aung Khant, YGN Ethical Hacker Group, Myanmar
> http://yehg.net/ ~ believe in full disclosure
>
> Product : CodeIgniter < http://www.codeigniter.com>
> Product Description : Open-source PHP Framework
> Pen-Tested Version : 1.5.2
> Vulnerability : User-Agent injection
> Risk : Medium
> Threat : XSS, Log File Tampering
>
> Advisory URL: http://yehg.net/lab/pr0js/view.php/CodeIgniter%20Global%20XSS%20Filtering%20Bypass%20Vulnerability.pdf
>
> Description:
> $CI->input->user_agent() fails to check the validity of user-agent type.
> It simply extracts from $_SERVER array without checking whether it is
> bad string injection or not. In this case, we can spoof user agent
> string of our browser with our arbitrary commands that can bypass
> stronger CodeIgniter Security class even if
> $config['global_xss_filtering'] = TRUE;. Thus we can execute XSS on
> the fly.
>
> _______________________________________________
> Full-Disclosure - We believe in it.
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_______________________________________________
Full-Disclosure - We believe in it.
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