SSH host key changed just after setting root password
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This might sound super suspicious, but it just happened to me:
I run a rented Raspberry Pi as my own mail server and today I set a root password to eventually login as root directly. I did not yet check whether the default configuration forbids root login. I exited the SSH session and restartet Putty to login as root.
The access was denied and after restarting Putty again to login to the account which I usually use, the host seems to have changed its key and Putty warned me about this.
Between setting the root password and getting the warning from Putty about the changed host key, less than two minutes passed. Also, I mostly trust the client machine, it is a quite freshly set up Windows 10 machine I got from my employer for work.
Should I be concerned, that someone cracked my server in such a short time (I couldn't do it nearly that fast)? It would not make any sense to change the key after already having root access.
What would be the best to do now? Should I contanct the data center operator to physically shut down my machine? Or should I just connect via SSH anyway?
ssh security putty ssh-keys
edited Nov 28 at 16:29
Mureinik
2,27951525
asked Nov 28 at 11:07
Fabian31415
62
add a comment |
up vote
1
down vote
favorite
This might sound super suspicious, but it just happened to me:
I run a rented Raspberry Pi as my own mail server and today I set a root password to eventually login as root directly. I did not yet check whether the default configuration forbids root login. I exited the SSH session and restartet Putty to login as root.
The access was denied and after restarting Putty again to login to the account which I usually use, the host seems to have changed its key and Putty warned me about this.
Between setting the root password and getting the warning from Putty about the changed host key, less than two minutes passed. Also, I mostly trust the client machine, it is a quite freshly set up Windows 10 machine I got from my employer for work.
Should I be concerned, that someone cracked my server in such a short time (I couldn't do it nearly that fast)? It would not make any sense to change the key after already having root access.
What would be the best to do now? Should I contanct the data center operator to physically shut down my machine? Or should I just connect via SSH anyway?
ssh security putty ssh-keys
edited Nov 28 at 16:29
Mureinik
2,27951525
asked Nov 28 at 11:07
Fabian31415
62
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:07
Actually, if you have the default rpi login, and enable root login, it might actually get hacked instantly if the provider is specialized to rpi hosting.
– davidbaumann
Nov 28 at 16:42
Thanks! I forgot to mention that all users have very strong passwords so far, because default login credentials are definitely a big threat.
– Fabian31415
Nov 29 at 9:12
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
This might sound super suspicious, but it just happened to me:
I run a rented Raspberry Pi as my own mail server and today I set a root password to eventually login as root directly. I did not yet check whether the default configuration forbids root login. I exited the SSH session and restartet Putty to login as root.
The access was denied and after restarting Putty again to login to the account which I usually use, the host seems to have changed its key and Putty warned me about this.
Between setting the root password and getting the warning from Putty about the changed host key, less than two minutes passed. Also, I mostly trust the client machine, it is a quite freshly set up Windows 10 machine I got from my employer for work.
Should I be concerned, that someone cracked my server in such a short time (I couldn't do it nearly that fast)? It would not make any sense to change the key after already having root access.
What would be the best to do now? Should I contanct the data center operator to physically shut down my machine? Or should I just connect via SSH anyway?
ssh security putty ssh-keys
edited Nov 28 at 16:29
Mureinik
2,27951525
asked Nov 28 at 11:07
Fabian31415
62
This might sound super suspicious, but it just happened to me:
I run a rented Raspberry Pi as my own mail server and today I set a root password to eventually login as root directly. I did not yet check whether the default configuration forbids root login. I exited the SSH session and restartet Putty to login as root.
The access was denied and after restarting Putty again to login to the account which I usually use, the host seems to have changed its key and Putty warned me about this.
Between setting the root password and getting the warning from Putty about the changed host key, less than two minutes passed. Also, I mostly trust the client machine, it is a quite freshly set up Windows 10 machine I got from my employer for work.
Should I be concerned, that someone cracked my server in such a short time (I couldn't do it nearly that fast)? It would not make any sense to change the key after already having root access.
What would be the best to do now? Should I contanct the data center operator to physically shut down my machine? Or should I just connect via SSH anyway?
ssh security putty ssh-keys
ssh security putty ssh-keys
edited Nov 28 at 16:29
Mureinik
2,27951525
asked Nov 28 at 11:07
Fabian31415
62
edited Nov 28 at 16:29
Mureinik
2,27951525
asked Nov 28 at 11:07
Fabian31415
62
edited Nov 28 at 16:29
Mureinik
2,27951525
edited Nov 28 at 16:29
Mureinik
2,27951525
edited Nov 28 at 16:29
Mureinik
2,27951525
2,27951525
asked Nov 28 at 11:07
Fabian31415
62
asked Nov 28 at 11:07
Fabian31415
62
asked Nov 28 at 11:07
Fabian31415
62
62
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:07
Actually, if you have the default rpi login, and enable root login, it might actually get hacked instantly if the provider is specialized to rpi hosting.
– davidbaumann
Nov 28 at 16:42
Thanks! I forgot to mention that all users have very strong passwords so far, because default login credentials are definitely a big threat.
– Fabian31415
Nov 29 at 9:12
add a comment |
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:07
Actually, if you have the default rpi login, and enable root login, it might actually get hacked instantly if the provider is specialized to rpi hosting.
– davidbaumann
Nov 28 at 16:42
Thanks! I forgot to mention that all users have very strong passwords so far, because default login credentials are definitely a big threat.
– Fabian31415
Nov 29 at 9:12
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:07
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:07
Actually, if you have the default rpi login, and enable root login, it might actually get hacked instantly if the provider is specialized to rpi hosting.
– davidbaumann
Nov 28 at 16:42
Actually, if you have the default rpi login, and enable root login, it might actually get hacked instantly if the provider is specialized to rpi hosting.
– davidbaumann
Nov 28 at 16:42
Thanks! I forgot to mention that all users have very strong passwords so far, because default login credentials are definitely a big threat.
– Fabian31415
Nov 29 at 9:12
Thanks! I forgot to mention that all users have very strong passwords so far, because default login credentials are definitely a big threat.
– Fabian31415
Nov 29 at 9:12
add a comment |
1 Answer
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It seems ridiculous, but restarting the Windows client machine solved(!) the problem. The server's auth.log does not show any strange activities.
answered Nov 28 at 11:08
Fabian31415
62
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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oldest
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up vote
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down vote
It seems ridiculous, but restarting the Windows client machine solved(!) the problem. The server's auth.log does not show any strange activities.
answered Nov 28 at 11:08
Fabian31415
62
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
add a comment |
up vote
0
down vote
It seems ridiculous, but restarting the Windows client machine solved(!) the problem. The server's auth.log does not show any strange activities.
answered Nov 28 at 11:08
Fabian31415
62
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
add a comment |
up vote
0
down vote
up vote
0
down vote
It seems ridiculous, but restarting the Windows client machine solved(!) the problem. The server's auth.log does not show any strange activities.
answered Nov 28 at 11:08
Fabian31415
62
It seems ridiculous, but restarting the Windows client machine solved(!) the problem. The server's auth.log does not show any strange activities.
answered Nov 28 at 11:08
Fabian31415
62
answered Nov 28 at 11:08
Fabian31415
62
answered Nov 28 at 11:08
Fabian31415
62
answered Nov 28 at 11:08
Fabian31415
62
62
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
add a comment |
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
moved here from stackoverflow
– Fabian31415
Nov 28 at 11:08
add a comment |
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moved here from stackoverflow
– Fabian31415
Nov 28 at 11:07
Actually, if you have the default rpi login, and enable root login, it might actually get hacked instantly if the provider is specialized to rpi hosting.
– davidbaumann
Nov 28 at 16:42
Thanks! I forgot to mention that all users have very strong passwords so far, because default login credentials are definitely a big threat.
– Fabian31415
Nov 29 at 9:12