Just an IoT Highway Sign in Los Angeles - Mon, Feb 25, 2019
I had a red eye flight last night and am deliriously sleepy, and somewhere in this state bubbled up a strong desire to find an electronic highway billboard and read what it said remotely. I read Skyline makes internet connected billboards and use port 161. So I got searching.
A Skyline Sign on 126.96.36.199
Skyline manufactures quite a few different kinds of signs, but all of them are related to car transit.
I found a few dozen results, all of them in the US, and I picked one in Los Angeles, with the thought that as the center of American car culture LA might have some interesting signs.
On port 161 the IP was running a service that used the Simple Network Management Protocol. I installed a set of SNMP Python tools to try and see if I could make a request for the contents of the sign, but given my aforementioned sleep deprivation addled state I couldn’t figure out how to make it work. I could definitely connect, but then had no idea what kind of flags to use etc and none of the examples I was seeing would work. Maybe it just was refusing me as I wasn’t authenticated, who knows. It was also running telnet servers on 23 and 2332, but both of those require logins. On 9091 and 9443 it was running a login for a Sierra Wireless Acemanager AirLink login. If you remember from back on day 32, the Sierra Wireless AirLink is a rugged router for remote outdoor locations. That makes sense given that it’s a road sign of some kind. I was able to find the contentless xml of what’s past the login screen. Even if I could log in, it doesn’t look like there would be any clues about what the sign actually said.
I went back and futzed with the SNMP a bit more, but realized that it’s not reaching out into the world and reading some random digital street sign that I needed. What I needed was a nap. See you tomorrow.