full-disclosure - Re: [0 Day] XSS Persistent in Blogspot of Google

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Message-ID: <CAAnPYQ4Eoe2VQ1Wgf=BFCQppU0ZyXQqLSqZuD_h-4PYycwN=GA@mail.gmail.com>
Date: Fri, 25 Jan 2013 14:24:39 +0100
From: Gynvael Coldwind <gynvael@...dwind.pl>
To: ANTRAX <antrax.bt@...il.com>
Cc: el-brujo@...acker.net, vuln@...unia.com,
	submissions@...ketstormsecurity.com, submit@...ecurity.com,
	full-disclosure@...ts.grok.org.uk, mr.inj3ct0r@...il.com,
	vuldb@...urityfocus.com, Hispabyte HQH <fdkaos2000@...oo.es>
Subject: Re: [0 Day] XSS Persistent in Blogspot of Google

Hey ANTRAX,

JZ is correct, even in the template view the script is still executed only
in the *.blogspot.com context, and not in the context of blogger.com - look
at your first screenshot - it's clearly said there that the alert box
popped up on *.blogspot.com.

It's good to always alert(document.domain) to be sure of the context in
which the script is executed.
As you know, script executing in the context of the cookieless *.
blogspot.com cannot interact / or steal cookies from blogger.com domain.

So, to repeat what JZ already said - this is by design, it's not a bug, and
no, you cannot attack an admin this way (unless you found some other way to
execute that script in the context of blogger.com - in such case try
reporting it again).

Cheers,
Gynvael Coldwind



On Tue, Jan 22, 2013 at 1:11 AM, ANTRAX <antrax.bt@...il.com> wrote:

> I know JZ, but this vulnerability is in the post and no in the template.
> And this could be generated by blogger and affect to administrator!
> The blogger can edit, but haven't admin. If the blogger post some script,
> this affect to administrator.
>
>
> ---
> Saludos Cordiales
> *ANTRAX*
> www.antrax-labs.org
>
>
> 2013/1/21 Jakub Zoczek <zoczus@...il.com>
>
>> Hi,
>>
>> *Execution of owner-supplied JavaScript on Blogger:* Blogger users are
>> permitted to place custom JavaScript in their own blog templates and blog
>> posts; our take on this is that blogs are user-generated content, not
>> different from any third-party website on the Internet. Naturally, for your
>> safety, we do employ spam and malware detection technologies - but we
>> believe that the flexibility in managing your own content is essential to
>> the success of our blogging platform.
>>
>> *Therefore, the ability to execute owner-supplied scripts on your own
>> blog is not considered to be a vulnerability. That being said, the ability
>> to inject arbitrary JavaScript onto somebody else’s blog would likely
>> qualify for a reward!
>>
>> *Source <http://www.google.com/about/appsecurity/reward-program/>*
>> *
>>
>>
>> Peace,
>> JZ
>>
>>
>> On Tue, Jan 22, 2013 at 12:01 AM, ANTRAX <antrax.bt@...il.com> wrote:
>>
>>> Hi all, I'm ANTRAX from Argentina, and I'm owner of www.underc0de.org
>>> Today, I going to shared with you about XSS in blogger. This is a very
>>> simple, but isn´t fix yet..
>>> This bug could be exploited by bloggers without administrator permissons
>>> .
>>>
>>> Steps to reproduce the XSS:
>>>
>>> 1.- Create a new post in the blog and insert some script
>>>
>>> [image: Imágenes integradas 1]
>>>
>>> 2.- When the administrator enter in the administration panel in
>>> "templates" section, blogger automatically executed the script, because
>>> blogger have a mini-preview in "Ahora en el blog", then execute the script
>>>
>>> [image: Imágenes integradas 2]
>>>
>>> 3.- Ready! the script has been executed!
>>>
>>> [image: Imágenes integradas 3]
>>>
>>> Also, you can steal cookies!
>>>
>>> [image: Imágenes integradas 4]
>>>
>>> I reported to google about it, but they not fixed yet.
>>>
>>> Kind regards partners!
>>>
>>> *ANTRAX*
>>>
>>
>>
>
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-- 
gynvael.coldwind//vx

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