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Special Forums Cybersecurity How can someone hack into a Linux server ? Post 302827681 by Scrutinizer on Sunday 30th of June 2013 11:35:36 AM
Old 06-30-2013
What services do you use, what ports do you have open? If you are not using a web server what is the account www-data for? Any service that is running on the server and that can be approached from the Internet by some port number, can be used for a hack and can be vulnerable. If there is a weakness in a service / daemon, than an attacker could potentially acquire the access rights of the user that is used to run that daemon, bypassing any strong password authentication you might have in place..
 

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XTELLD(8)						      System Manager's Manual							 XTELLD(8)

NAME
xtelld - daemon receiving messages from xtell(1) clients SYNOPSIS
xtelld [options] DESCRIPTION
xtelld is daemon receiving messages from the xtell(1) client and displaying them to apropriate user. OPTIONS
--help Short help --alone Force server to run standalone --inetd Force server to act as service of inetd --version Print version information and exit. -sX Lifetime for spawned services (in seconds) ex: -s25 maintain connections for up to 25 seconds -mX Spawn no more than X children services at a time ex: -m15 service no more than 15 requests at once. Note: ignored if inetd service -pX Use port X, default: 4224 -n Do not lookup addresses, use IP numbers instead USAGE
Xtell daemon can run either from inetd(preferred) or from command line. If you decide to start it from inetd, add this line to /etc/ser- vices : xtell 4224/tcp # xtell server and this line to /etc/inetd.conf : xtell stream tcp nowait nobody.tty /usr/sbin/tcpd /usr/local/sbin/xtelld Notice that the entries are separated by tabs, not spaces. Restart inetd with killall -HUP inetd What to do if you are a normal user and want to run xtell daemon: You can't run it from inetd, obviously. Just start ./xtelld to use xtell on default port (4224). In this case, xtell can write messages only to you. If there is another user on that system willing to get messages, either s/he starts xtelld on another port (e.g. ./xtelld -p4225), or makes his/her tty writable by you (e.g. chmod a+rw /dev/tty* /dev/pts/*) AUTHOR
Radovan Garabik (garabik@fmph.uniba.sk) SEE ALSO
xtell(1), write(1), talk(1), talkd(8), tty(1) XTELLD(8)
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