Re: Anyone running C-Data OLTs?

[Alexander Neilson <alexander () neilson net nz>]

I think the article may also be confusing OLT and ONT. 

They are talking about how the “OLT” that is vulnerable is the device that translates the fibre into the copper 
Ethernet connected to customers equipment which may indicate these are actually ONT’s being talked about or the article 
authors got their explanation confused. 

For these to be internet exposed presumably they must be including a router function and not simply doing some bridging 
of customer traffic. 

I haven’t checked (on mobile) but those affected model numbers could confirm if it’s OLT, ONT, or both. Possibly the 
confusion could come from the bug affecting both. 

Regards
Alexander

Alexander Neilson
Neilson Productions Limited
021 329 681
alexander () neilson net nz

> On 11/07/2020, at 08:04, Mel Beckman <mel () beckman org> wrote:
>
>  The “WAN” port of an OLT _is_ it’s management port. Data, IPTV, and VoIP traffic pass on VLANs, typically 
> encrypted. These are passive optical network (PON) devices, where all CPE in a group of, say, 32 premises receive the 
> same light via an optical splitter. Thus network partitioning is a requirement of the architecture. There is no 
> concept of a traditional “WAN” port facing the Internet. 
>
> -mel via cell
>
> > > On Jul 10, 2020, at 12:21 PM, Owen DeLong <owen () delong com> wrote:
> > 
> > Um, from the article it appears that this isn’t on the Management interface, but the WAN port of the OLT.
> >
> > Owen
> >
> >
> > > On Jul 10, 2020, at 11:01 , Mel Beckman <mel () beckman org> wrote:
> > >
> > > But who, who I ask, opens their management interface to the public Internet?!?!
> > >
> > > Maybe this is vulnerability if you have a compromised management network, but anybody who opens CPE up to the 
> > > Internet is just barking mad :-)
> > >
> > > -mel via cell
> > >
> > > > On Jul 10, 2020, at 10:00 AM, Owen DeLong <owen () delong com> wrote:
> > > >
> > > >  
> > > > https://www.zdnet.com/article/backdoor-accounts-discovered-in-29-ftth-devices-from-chinese-vendor-c-data/?ftag=TRE-03-10aaa6b&bhid=29077120342825113007211255328545&mid=12920625&cid=2211510872
> > > >
> > > > Wow… Just wow.
> > > >
> > > > Owen