Perhaps you’re confusing OLT with ONT? An OLT is a “curbside” distribution node, the ONT is the CPE. The vulnerability is in the distribution node, not the CPE. No provider with any sense exposes their distribution node admin interface to the Internet. 

-mel via cell

On Jul 10, 2020, at 1:01 PM, 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