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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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rpc.nispasswdd(1M)					  System Administration Commands					rpc.nispasswdd(1M)

NAME
rpc.nispasswdd, nispasswdd - NIS+ password update daemon SYNOPSIS
/usr/sbin/rpc.nispasswdd [-a attempts] [-c minutes] [-D] [-g] [-v] DESCRIPTION
rpc.nispasswdd daemon is an ONC+ RPC service that services password update requests from nispasswd(1) and yppasswd(1). It updates password entries in the NIS+ passwd table. rpc.nispasswdd is normally started from a system startup script after the NIS+ server (rpc.nisd(1M)) has been started. rpc.nispasswdd will determine whether it is running on a machine that is a master server for one or more NIS+ directories. If it discovers that the host is not a master server, then it will promptly exit. It will also determine if rpc.nisd(1M) is running in NIS (YP) compatibility mode (the -Yop- tion) and will register as yppasswdd for NIS (YP) clients as well. rpc.nispasswdd will syslog all failed password update attempts, which will allow an administrator to determine whether someone was trying to "crack" the passwords. rpc.nispasswdd has to be run by a superuser. OPTIONS
-a attempts Set the maximum number of attempts allowed to authenticate the caller within a password update request session. Failed attempts are syslogd(1M) and the request is cached by the daemon. After the maximum number of allowed attempts the daemon severs the connection to the client. The default value is set to 3. -c minutes Set the number of minutes a failed password update request should be cached by the daemon. This is the time during which if the daemon receives further password update requests for the same user and authentication of the caller fails, then the dae- mon will simply not respond. The default value is set to 30minutes. -D Debug. Run in debugging mode. -g Generate DES credential. By default the DES credential is not generated for the user if they do not have one. By specifying this option, if the user does not have a credential, then one will be generated for them and stored in the NIS+ cred table. -v Verbose. With this option, the daemon sends a running narration of what it is doing to the syslog daemon. This option is useful for debugging problems. EXIT STATUS
0 success 1 an error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnisu | +-----------------------------+-----------------------------+ SEE ALSO
svcs(1), nispasswd(1), passwd(1), yppasswd(1), rpc.nisd(1M), syslogd(1M), svcadm(1M), nsswitch.conf(4), attributes(5), smf(5) NOTES
NIS+ might not be supported in future releases of the Solaris Operating system. Tools to aid the migration from NIS+ to LDAP are available in the current Solaris release. For more information, visit http://www.sun.com/directory/nisplus/transition.html. The rpc.nispasswdd service is managed by the service management facility, smf(5), under the service identifier: svc:/network/rpc/nisplus:default Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser- vice's status can be queried using the svcs(1) command. SunOS 5.11 13 Aug 2004 rpc.nispasswdd(1M)
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