Re: security hole on local ISP

["McGhee, Eddie" <Eddie.McGhee () ncr com>]

Just another point to add to the dangers, once they have access to the router/modem simply setting up some port 
forwarding is going to give internal access, quick look at the DHCP client list forward the most prominent ports that 
are in use or stick interesting clients in a DMZ and attack away. 

-----Original Message-----
From: full-disclosure-bounces () lists grok org uk [mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of T 
Biehn
Sent: 29 December 2009 17:08
To: Lee
Cc: full-disclosure () lists grok org uk
Subject: Re: [Full-disclosure] security hole on local ISP

This is a hiroshima versus 'harmless' mountain demonstration debate, Lee. Because the post includes the raw data 
including ports, passwords and ranges one must assume that "Cilia Pretel Gallo" was appealing to the lowest common 
denominator, to a group of individuals where checking NRO whois db for ETB's netblocks would not be an obvious first 
step.

Ahem.

-Travis

On Tue, Dec 29, 2009 at 11:36 AM, Lee <ler762 () gmail com> wrote:
> On Tue, Dec 29, 2009 at 10:23 AM, T Biehn <tbiehn () gmail com> wrote:
> > This is an orgiastic dump of information, you must really hate ETB; 
> > or you must be really excited for lulz.
>
> or you're hoping that full disclosure will get ETB to fix the problem.
>
> Regard,
> Lee
>
> > -Travis
> >
> > On Tue, Dec 29, 2009 at 5:23 AM, Cilia Pretel Gallo 
> > <cpretelgallo () yahoo com> wrote:
> > > I've recently discovered a security hole on the modems (which 
> > > double as
> > > routers) used by a Colombian ISP - ETB.
> > >
> > > It so happens that all incoming connections to an IP address on 
> > > said ISP on port 23 or port 80 land on the modem instead of the 
> > > computer(s) connected to it. Even if one tries to redirect those 
> > > ports to a local machine, the modem still gets all the connections on those ports.
> > > Also, connections on ports 23 and 80, from any IP address, will 
> > > access the modem configuration options. Last year that could be 
> > > done only from private IP addresses (i.e. 192.168.0/24), but now it 
> > > can be done, as I said, from anywhere. I've been told that a few 
> > > lucky users were able to forward port 80, but in that case, it's port 8080 that is intercepted by the modem.
> > > The end result is that anyone, from anywhere, can access the modem 
> > > of anyone on ETB to mess up their configuration (e.g. obtaining and 
> > > changing the client's username and password, permanently 
> > > disconnecting them from the internet, and so on) - that is, if they have the administration password.
> > > Unfortunately, ETB uses the same login/password on all of their 
> > > modems since 2006, which are publicly available on the web.
> > > Login: Administrator
> > > Password: soporteETB2006
> > >
> > > The whole IP range 190.24/14 corresponds to ETB clients. Any IP on 
> > > that range where ports 80 and 23 are open is most likely a wide open ETB modem.
> > >
> > > Apparently, this issue has been repeatedly reported to ETB, but it 
> > > always falls on deaf ears. They seem to think this is no big deal 
> > > since nobody knows the username and password for the modems - which 
> > > is not the case, and even if it were, they would be easily crackable by brute force.
> > >
> > > Peace,
> > >
> > > -Cilia
> > >
> > >
> > >
> > >
> > >  
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--
FD1D E574 6CAB 2FAF 2921  F22E B8B7 9D0D 99FF A73C 
http://pgp.mit.edu:11371/pks/lookup?search=tbiehn&op=index&fingerprint=on
http://pastebin.com/f6fd606da

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/