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

[ANTRAX <antrax.bt () gmail com>]

Gynvael Coldwind, I know this and I posted a reply in Underc0de about that.

http://underc0de.org/foro/hacking-showoff/xss-persistente-blogger-13978/

It isn't a critical bug but, despite that, this shouldn't happen..

Thanks all!

---
Best Regards
*ANTRAX*



2013/1/25 Gynvael Coldwind <gynvael () coldwind pl>

> 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 () gmail 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 () gmail 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 () gmail 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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