ssh allowing root login with no password
Steven Buehler
steve at ibushost.com
Mon May 9 19:18:33 UTC 2011
I am trying to setup our servers to only allow logins with a public/private
key pair. 2 of our machines have to have root login access with ssh and the
rest, we will login as another account and su to root. I just started with
this company and on their boxes which range from version 5.1 to 5.5, if I
open up the firewall to allow ssh access from anywhere, I can ssh to root
without a password. The only uncommented lines in the /etc/ssh/sshd_config
are the following:
Protocol 2
SyslogFacility AUTHPRIV
PasswordAuthentication no
ChallengeResponseAuthentication no
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes
UsePAM no
PubkeyAuthentication yes
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY
LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL
GatewayPorts yes
X11Forwarding yes
Subsystem sftp /usr/libexec/openssh/sftp-server
I'm hoping that someone can lead me in the right direction as I can't figure
this one out. If this was only one machine, I would assume that it might
have been hacked, but this is all of their servers and VM's that will allow
me to ssh to them without a login/password and get into root. Luckily, they
have always had their (supposedly anyway) iptables set to only allow access
from specific IP's.
Thanks
Steve
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