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

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Date: Tue, 22 Jan 2013 01:02:38 +0100
From: Jakub Zoczek <zoczus@...il.com>
To: ANTRAX <antrax.bt@...il.com>
Cc: Hispabyte HQH <fdkaos2000@...oo.es>, vuln@...unia.com,
	submissions@...ketstormsecurity.com, vuldb@...urityfocus.com,
	submit@...ecurity.com, full-disclosure@...ts.grok.org.uk,
	mr.inj3ct0r@...il.com, el-brujo@...acker.net
Subject: Re: [0 Day] XSS Persistent in Blogspot of Google

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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Download attachment "xss4.png" of type "image/png" (31412 bytes)

Download attachment "xss2.png" of type "image/png" (121499 bytes)

Download attachment "xss1.png" of type "image/png" (30859 bytes)

Download attachment "Blogger XSS.png" of type "image/png" (240406 bytes)

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