HACKER Q&A
📣 skonteam

Weird SSH Probes from Cloudflare IPs


Hello, I have a honeypot listening to the ether, and these last days i have been seeing SSH probes coming from Cloudflare assigned IPs : ` {"time":"2022-07-11T06:17:29Z","source":"8.37.43.23:58024","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.17.38.1831312192.210.190.111"}} {"time":"2022-07-11T06:25:22Z","source":"8.42.172.26:50945","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.47.29.8435351192.210.190.111"}} {"time":"2022-07-11T06:25:45Z","source":"8.39.18.128:58679","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.32.82.2852512192.210.190.111"}} {"time":"2022-07-11T06:41:58Z","source":"8.40.140.107:62073","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.63.46.5342522192.210.190.111"}} {"time":"2022-07-11T07:02:18Z","source":"8.40.140.107:52379","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.54.95.6913424192.210.190.111"}} {"time":"2022-07-11T07:02:30Z","source":"8.39.18.128:53547","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.39.94.9344142192.210.190.111"}} {"time":"2022-07-11T07:44:32Z","source":"8.37.43.23:62487","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.73.77.3531321192.210.190.111"}} {"time":"2022-07-11T07:52:05Z","source":"8.37.43.34:60661","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.86.72.1144123192.210.190.111"}} {"time":"2022-07-11T08:26:13Z","source":"8.42.172.26:56143","event_type":"connection","event":{"client_version":"SSH-2.0-8.35 FlowSsh: FlowSshNet_SftpStress127.46.19.3324353192.210.190.111"}} `

Is this normal behavior and Cloudflare is known to scan the IPv4 space ?

Thanks.

  👤 zinekeller Accepted Answer ✓
Cloudflare WARP: https://blog.cloudflare.com/1111-warp-better-vpn/

I've noticed it (https://news.ycombinator.com/item?id=28652294) when someone has quipped about SSH scans coming from Cloudflare (https://news.ycombinator.com/item?id=28651598).

It's a boon for hackers since it provides an unlimited good-quality VPN. If you want to block them (either block only for SSH or just block WARP users in retaliation), here's a list of their IPs: https://www.cloudflare.com/ips/

👤 speedgoose
By the way, unless you run a honey pot, you should probably only allow a few IP ranges for SSH in your firewall.
👤 ancarda
Perhaps it's for https://radar.cloudflare.com/ or maybe a new service where they'll warn you if services like SSH are configured badly or not firewall'd off?

Also, is it possible this traffic is actually coming from a worker, i.e. https://workers.cloudflare.com/ rather than Cloudflare themselves?

👤 garblegarble
What makes you think these are Cloudflare addresses? Whois suggests they belong to Level 3