01-15-2013
Hi,
There are some ways to enter a compromised system even if you have changed the root password. Probably the hacker has modified the system, so he can enter without being asked a password.
Your best bet to solve the problem is backup everything valuable and get a new server installed. The only way I know of investigating a compromised server that can lead anywhere is taking it offline to avoid more interference from the hacker.
Think that probably the hacker is inside your system and you could not detect it.
All the tools like rkhunter tell you to not relay only on them. And they are good for detection, but they don't serve for more than that.
Hope you get it solved
jmanel
This User Gave Thanks to jmanel For This Post:
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LEARN ABOUT OSF1
yppasswd
yppasswd(1) General Commands Manual yppasswd(1)
NAME
yppasswd - change password in Network Information Service (NIS)
SYNOPSIS
yppasswd [name]
DESCRIPTION
Note
If Enhanced Security is enabled on your system, use the passwd command to change your password, even if NIS is in use.
The yppasswd command lets you change your password in the Network Information Service (NIS) map, a network data base service. Only you or
the superuser can change your NIS password.
When you enter the yppasswd command, the program prompts you for the old password and then for the new password. Note that the passwords
are not displayed on the screen.
Next, the program asks you for the new password again, to verify that you have typed it correctly. If you do not type the passwords cor-
rectly, you will receive an error message after you enter the new password.
Your new NIS password must meet one of the following requirements: It must be a combination of at least six alphanumeric characters, or It
must be a minimum of four characters, with at least one being non-alphanumeric, such as a control sequence.
Note
The passwd command does not change the NIS password. This command only changes the local password file (/etc/passwd), and not the NIS mas-
ter password file.
ERRORS
Your new password does not meet the minimum length requirement. You misspelled your new password or its verification. Your new password
can not be activated. It must be different from your old password and your login name.
FILES
Password file NIS directory
SEE ALSO
passwd(1), passwd(4), ypfiles(4), yppasswdd(8)
Network Administration
yppasswd(1)