Hack a centos Linux box

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Operating Systems Linux Red Hat Hack a centos Linux box
# 1  
Hack a centos Linux box

I have a Centos linux box and there is interface connect to internet.
I stop the iptables in this box .
After a few day , I find the linux box have been hacked and install some perl script into the box .
Could anyone tell me how the hacker can login into the centos box without knowing the root passwd ???
How can they do it ?? please advise in detailed stop...
# 2  
The UNIX and Linux Forums is not a hackers site. We are not going to give you instructions describing how to break into a Centos Linux box (or any other box).
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