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Re: [Full-disclosure] COM Server-Based Binary Planting ProofOfConcept



Dan,

1) Are you sure a stock build of Windows doesn't pop a security
warning when right clicking the file:// IFRAME?  You might have munged
your test OS.

IE allows you to right-click on a folder (but not on a file or on the "background") inside a file:// iframe without popping up a security warning. No idea why but it does.

2) You're getting closer with this "Send To" stuff, but you're still
socially engineering.  Definitely better than classic "please download
and execute this file" though.

I personally think that the "click twice on this web page" exploit that we released today requires even less social engineering than the "Send to" one.

You really should stop talking about exploits against Powerpoint etc.
As long as I can make an .exe that visually looks pixel for pixel like
a .ppt, the security model you imagine (that the desktop can
differentiate between code execution and document editing) doesn't
exist.

I can partly agree with this for local attacks where attacker places a malicious file - be it .ppt or .exe - somewhere on user's computer or USB drive and get the user to double-click it. With a remote attack of this type, Windows Explorer will issue a security warning if you double-click an .exe on a remote share, but will let you double-click a .ppt without such warning. It's hard to say what percentage of users would actually be stopped by such warning but I'd consider it a part of the security model.

Another case where a malicious .ppt lookalike executable would be thwarted but binary planting may not be is with Windows Software Restriction Policy or Windows AppLocker. In their default configurations, both stop launching EXEs from untrusted locations, but don't stop loading DLLs from arbitrary folders. So double-clicking on a .ppt lookalike executable would be blocked, but a malicious DLL next to a real .ppt file wouldn't be. But again, no idea as to how many/few computers use this protection.

This work is better, if incomplete.

Security research is never complete, so we settle for constant improvement.

Cheers,
Mitja


On Thu, Jun 2, 2011 at 9:32 AM, Mitja Kolsek <mitja.kolsek@xxxxxxxx> wrote:

Thor, the "Online Proof of Concept" section of the blog post points you to a *remote*
exploit (without any warning) but let me repeat the link here:

http://www.binaryplanting.com/demo/XP_2-click/test.html

Visit this with IE8 on 32-bit Windows XP.

Please find further information here:

http://blog.acrossecurity.com/2011/05/anatomy-of-com-server-based-binary.html
http://blog.acrossecurity.com/2011/05/silently-pwning-protected-mode-ie9-and.html

In general there are two types of remote binary planting exploits: SMB and WebDAV. The former works inside (local) networks where firewalls block outbound SMB traffic. WebDAV attacks work through firewalls too since many firewalls allow outbound WebDAV traffic and Windows silently fall back to WebDAV if SMB doesn't work. If our online remote exploit doesn't work for you, you can download the PoC locally and test it in
your local network.

I'll be happy to explain it to you further if need be.

Thanks,
Mitja


-----Original Message-----
From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
Sent: Thursday, June 02, 2011 6:00 PM
To: security@xxxxxxxxxxxxxxxxx; 'Dan Kaminsky'
Cc: full-disclosure@xxxxxxxxxxxxxxxxx; bugtraq@xxxxxxxxxxxxxxxxx
Subject: RE: [Full-disclosure] COM Server-Based Binary
Planting ProofOfConcept

But it *is* worth mentioning that you have to create the
malicious dll file, copy it to the system, create folders
etc, and all the other mumbo jumbo to "exploit" this in the
"default configuration." Â So, the answer to Dan's question
is actually, "no, you can't." ÂWhich brings into question the
actual "worth" of mentioning this in the first place. :)

t

> -----Original Message-----
> From: full-disclosure-bounces@xxxxxxxxxxxxxxxxx
> [mailto:full-disclosure- bounces@xxxxxxxxxxxxxxxxx] On
Behalf Of ACROS
> Security Lists
> Sent: Thursday, June 02, 2011 8:42 AM
> To: 'Dan Kaminsky'; security@xxxxxxxxxxxxxxxxx
> Cc: full-disclosure@xxxxxxxxxxxxxxxxx; bugtraq@xxxxxxxxxxxxxxxxx
> Subject: Re: [Full-disclosure] COM Server-Based Binary
Planting Proof
> OfConcept
>
> It would hardly be worth mentioning otherwise.
>
> Cheers,
> Mitja
>
> > -----Original Message-----
> > From: full-disclosure-bounces@xxxxxxxxxxxxxxxxx
> > [mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] On
Behalf Of Dan
> > Kaminsky
> > Sent: Thursday, June 02, 2011 5:36 PM
> > To: security@xxxxxxxxxxxxxxxxx
> > Cc: si-cert@xxxxxxxx; full-disclosure@xxxxxxxxxxxxxxxxx;
> > bugtraq@xxxxxxxxxxxxxxxxx; cert@xxxxxxxx
> > Subject: Re: [Full-disclosure] COM Server-Based Binary Planting
> > Proof OfConcept
> >
> > Does this run code without prompting, on a reasonably default
> > configuration?
> >
> > On Thu, Jun 2, 2011 at 7:52 AM, ACROS Security Lists
> > <lists@xxxxxxxx>
> > wrote:
> > >
> > > We published a remote/local proof of concept for the COM
> > Server-Based
> > > Binary Planting exploit presented at the Hack in the Box
> > conference in Amsterdam.
> > >
> > > Feel free to try it out online if WebDAV works through your
> > firewall,
> > > or download it and test it in your local network or simply
> > on your computer.
> > >
> > >
> >
http://blog.acrossecurity.com/2011/06/com-server-based-binary-planti
> > ng
> > > -proof.html
> > > or
> > > http://bit.ly/iSxHKO
> > >
> > > Best regards,
> > >
> > > Mitja Kolsek
> > > CEO&CTO
> > >
> > > ACROS, d.o.o.
> > > Makedonska ulica 113
> > > SI - 2000 Maribor, Slovenia
> > > tel: +386 2 3000 280
> > > fax: +386 2 3000 282
> > > web: http://www.acrossecurity.com
> > >
> > > ACROS Security: Finding Your Digital Vulnerabilities Before
> > Others Do
> > >
> > >
> > > _______________________________________________
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>
> _______________________________________________
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