Hi,
No idea what to do with this information since I don't know enough about the hack to submit anything on HackerOne so I post it here.
Anyways - my EdgeMAX X SFP router got hacked. Got an e-mail today from my ISP that there were lots of port scans on port 22 done from my IP address, and that I likely had a network device that was hacked. My first instinct was to try to update the firmware on my router (from 1.9.0 to 1.9.1).
Tried to upload the firmware to the router - got an error message. Then tried to delete the firmware images stored on the router to make space (in case that was the problem) according to the instructions on firmware release notes. Got the message that the router had been updated and needed a reboot. So I rebooted.
Then, the router didn't start up - didn't get an IP through DHCP, so I entered a fixed IP and tried to connect to 192.168.1.1 - and got a splash screen with an error message from an ASUS firmware saying that my ASUS RT-bla bla needed to be rebooted?!
I'm guessing this means the router was hacked and some other firmware was installed on it somehow, and whoever hacked it used it to do the port scans that my ISP warned me about.
So I guess this means the EdgeMAX X-SFP w. firmware version 1.9.0 has a pretty big security exploit.
Again - don't know what to do with this information, but maybe it helps someone else. Maybe the exploit is well-known - I don't know.
/Jonas