Microsoft-beveiligingsadvies: Beveiligingsprobleem in SQL Server kan leiden tot uitvoering van externe code

'*************************************************************************************
'Beschrijving: Dit script doorloopt alle actieve versies van SQL Server
'            en weigert machtiging voor uitvoeren op sp_replwritetovarbin voor publiek
'            op alle getroffen versies.
'            DIT IS EEN TIJDELIJKE OPLOSSING DIE NIET MOET WORDEN GEBRUIKT INDIEN
'            EEN BEVEILIGINGSUPDATE IS GELEVERD EN GEÏNSTALLEERD.
'*************************************************************************************

OPTION EXPLICIT
ON ERROR RESUME NEXT

* Constante waarden
CONST EXIT_SUCCESS       = 0
CONST EXIT_FAILURE       = 1
CONST EXIT_NOINSTANCES   = -1
CONST DEFAULTNAMESPACE   = "root\default"
CONST STDREGPROV         = "stdregprov"
CONST HKEY_LOCAL_MACHINE = &H80000002
CONST REG_MULTI_SZ       = 7
CONST REG_SZ             = 1
CONST adCmdText          = 1


Call VBMain()

Function VBMain()
    Err.Clear
    ON ERROR RESUME NEXT

    Dim sInstances(), strInstance, i, TotalCount
    VBMain = EXIT_SUCCESS
    If GetInstances(sInstances, TotalCount) = FALSE Then
        WScript.Quit EXIT_FAILURE
    End If

    If IsEmptyNull(sInstances) Then 
        WScript.Echo "INFO: Er zijn geen exemplaren aanwezig."
        VBMain = EXIT_NOINSTANCES
        Exit Function
    End If

    For i = 0 To TotalCount-1
        strInstance = sInstances(i,0)
        GetFullInstance strInstance, sInstances(i,1)
        If ApplyFix(sInstances(i,0), strInstance) = FALSE Then
            WScript.Echo "FOUT: Kan de oplossing niet implementeren op " + sInstances(i,0) + "." + vbCRLF
            VBMain = EXIT_FAILURE
        End If
    Next

    WScript.Echo "INFO: Verwerking van alle actieve SQL-exemplaren is voltooid."
End Function

Function GetInstances(ByRef sInstances, ByRef TotalCount)
    Err.Clear
    ON ERROR RESUME NEXT

    Dim sInstances1, sInstances2, i
    Dim instCount1, instCount2
    GetInstances = FALSE

    If NOT GetRegValue ("", HKEY_LOCAL_MACHINE, "Software\Microsoft\Microsoft SQL Server", "InstalledInstances", sInstances1, REG_MULTI_SZ, TRUE) Then
        WScript.Echo "FOUT: Lezen van op de machine geïnstalleerde SQL-exemplaren is mislukt."
        Exit Function
    End If

    sInstances2 = NULL
    If IsOs64Bit() = TRUE Then
        If NOT GetRegValue ("", HKEY_LOCAL_MACHINE, "Software\Microsoft\Microsoft SQL Server", "InstalledInstances", sInstances2, REG_MULTI_SZ, FALSE) Then
            WScript.Echo "FOUT: Lezen van op de machine geïnstalleerde SQL-exemplaren is mislukt."
            Exit Function
        End If
    End If

    If IsEmptyNull(sInstances1) AND IsEmptyNull(sInstances2) Then 
        WScript.Echo "INFO: Geen exemplaren aanwezig."
        WScript.Quit EXIT_SUCCESS
    End If

    instCount1 = 0
    instCount2 = 0 
    TotalCount = 0
    If IsEmptyNull(sInstances1) = FALSE Then
        instCount1 = UBound(sInstances1) + 1
        TotalCount = instCount1
    End If

    If IsEmptyNull(sInstances2) = FALSE Then
        instCount2 = UBound(sInstances2) + 1
        TotalCount = TotalCount + instCount2
    End If

    ReDim PRESERVE sInstances(TotalCount,1)
    if instCount1 > 0 Then
        For i = 0 To UBound(sInstances1)
            sInstances(i,0) = sInstances1(i)
            sInstances(i,1) = True
        Next
    End If
    If instCount2 >0 Then
        For i = 0 To UBound(sInstances2)
            sInstances(i+instCount1,0) = sInstances2(i)
            sInstances(i+instCount1,1) = FALSE
        Next
    End If
    GetInstances = TRUE
End Function


Function ApplyFix(ByVal strInstance, ByVal strServerName)
    Err.Clear
    ON ERROR RESUME NEXT

    Dim objConn, objCmd, objCmd1, objRS, objRS1
    Dim strCommand, strConn
    Dim strBuildVersion, strProductLevel, bApplyFix

    ' Retourwaarde initialiseren
    ApplyFix = FALSE

    strConn = "Provider=sqloledb;Initial Catalog=master;Integrated Security=SSPI;Data Source=" + strServerName + ";"
    ' Foutcontrole met opzet weggelaten om de code kort te houden
    Set objConn = CreateObject("ADODB.Connection")
    Set objCmd = CreateObject("ADODB.Command")
    Set objCmd1 = CreateObject("ADODB.Command")

    ' Verbinding met de hoofddatabase openen
    objConn.Open strConn 
    If ErrorOccurred("Fout: Kan geen verbinding maken met " + strInstance) Then
        Set objConn = Nothing
        Exit Function
    End If

    ' Versie valideren voordat de correctie wordt geïmplementeerd
    strCommand = "select SERVERPROPERTY('ProductVersion') as version, SERVERPROPERTY('productlevel') as productlevel"
    objCmd.ActiveConnection = objConn
    objCmd.CommandType = adCmdText
    objCmd.CommandText = strCommand

    Set objRS = objCmd.Execute()
    If ErrorOccurred("FOUT: Kan """ + strCommand + """ niet uitvoeren op " + strInstance) = TRUE Then
        objConn.Close()
        Set objConn = Nothing
        ApplyFix = FALSE
        Exit Function   
    End If

    strBuildVersion = objRS("version")
    strProductLevel = UCase(objRS("productlevel"))

    bApplyFix = FALSE
    ' Oplossing alleen implementeren voor versies van SQL 2000 en SQL 2005 (RTM, SP1 and SP2)
    If (CInt(Mid(strBuildVersion,1,1)) = 8) Then
        bApplyFix = TRUE
    ElseIf CInt(Mid(strBuildVersion,1,1)) = 9 AND (StrComp(strProductLevel,"RTM") = 0 OR StrComp(strProductLevel,"SP1") = 0 OR StrComp(strProductLevel,"SP2") = 0) Then
        bApplyFix = TRUE
    End If 

    If bApplyFix = TRUE Then
        strCommand = "uitvoeren weigeren op sp_replwritetovarbin voor publiek"
        objCmd1.ActiveConnection = objConn
        objCmd1.CommandType = adCmdText
        objCmd1.CommandText = strCommand
        Set objRS1 = objCmd1.Execute()
        If ErrorOccurred("FOUT: Kan """ + strCommand + """ niet uitvoeren op " + strInstance) = FALSE Then
            WScript.Echo "INFO: De tijdelijke oplossing is met succes geïmplementeerd op " + strInstance + " (" + strBuildVersion + ")." + vbCRLF
            ApplyFix = TRUE
        End If
    Else
        WScript.Echo "INFO: Het verzamelen van informatie voor " + strInstance + " (" + strBuildVersion + ") wordt overgeslagen omdat dit exemplaar geen beveiligingsprobleem heeft." + vbCRLF
        ApplyFix = TRUE
    End If

    objConn.Close()
    Set objConn = Nothing
    Set objCmd = Nothing
    Set objCmd1 = Nothing
    Set objRS = Nothing
    Set objRS1 = Nothing
End Function

Private Function GetRegValue (ByVal strMachineName, ByVal hMainKey, ByVal strPath, ByVal strValueName, ByRef strValue, ByVal iValueType, ByVal b32bit)
    Err.Clear
    ON ERROR RESUME NEXT

    Dim objLocator, objServices, objRegistry, objCtx
    Dim sMultiStrings, lRc
    GetRegValue = TRUE

    ' Verbinden met WMI en een object ophalen voor klasse STDREGPROV.
    Set objCtx = CreateObject("WbemScripting.SWbemNamedValueSet")
    If b32bit = TRUE Then
        objCtx.Add "__ProviderArchitecture", 32
    Else
        objCtx.Add "__ProviderArchitecture", 64
    End If
    objCtx.Add "__RequiredArchitecture", TRUE
    set objLocator = createobject("wbemscripting.swbemlocator")
    set objServices = objLocator.connectserver(strMachineName,DEFAULTNAMESPACE, "", "",,,,objCtx)
    set objRegistry = objServices.get(STDREGPROV)
    If ErrorOccurred("FOUT: Kan geen verbinding maken met WMI-naamruimte " + DEFAULTNAMESPACE) Then
        GetRegValue = FALSE
        Exit Function
    End If 

    lRc = 0
    Select Case iValueType
        ' Het gaat ons alleen maar om REG_MULTI_SZ
        Case REG_MULTI_SZ
            strValue = ""
            lRC = objRegistry.GetMultiStringValue(hMainKey, strPath, strValueName, sMultiStrings)
            strValue = sMultiStrings
        Case REG_SZ
            strValue = ""
            lRC = objRegistry.GetStringValue(hMainKey, strPath, strValueName, strValue)
        Case Else
            GetRegValue = FALSE
    End Select

    If lRc = 2 Or lRc = 3 Then
        GetRegValue = TRUE
        strValue = ""
    ElseIf Err.Number OR lRc <> 0 Then
        GetRegValue = FALSE
    End If

    Set objLocator = Nothing
    Set objServices = Nothing
    Set objRegistry = Nothing
End Function

Function IsEmptyNull(sCheck)
    IsEmptyNull = FALSE
    If IsObject(sCheck) Then Exit Function
    If IsArray(sCheck) Then Exit Function
    If VarType(sCheck) = vbEmpty Then IsEmptyNull = TRUE : Exit Function
    If VarType(sCheck) = vbNull Then IsEmptyNull = TRUE : Exit Function
    If sCheck = "" Then IsEmptyNull = TRUE
End Function

Private Function ErrorOccurred (ByVal strIn)
    If Err.Number <> 0 Then
        WScript.Echo strIn
        WScript.Echo "FOUT: 0x" & Err.Number & " - " & Err.Description
        Err.Clear
        ErrorOccurred = TRUE
    Else
        ErrorOccurred = FALSE
    End If
End Function

Function IsOs64Bit()
    Err.Clear
    ON ERROR RESUME NEXT

    Dim objProc
    Set objProc = GetObject("winmgmts:root\cimv2:Win32_Processor='cpu0'")
    If objProc.Architecture = 0 Then
        IsOs64Bit = FALSE
    Else
        IsOs64Bit = TRUE
    End If
End Function

Function GetFullInstance (ByRef strInstanceName, ByVal b32bit)
    Err.Clear
    ON ERROR RESUME NEXT 

    Dim objServices, objClusters, objCluster
    Dim strMacName, isEmpty
    Dim strKey, strInstID

    GetFullInstance = TRUE

    If strComp(UCase(strInstanceName), "MICROSOFT##SSEE", 1) = 0 Then
        strInstanceName = "np:\\.\pipe\mssql$microsoft##ssee\sql\query"
        Exit Function
    End if

    strMacName = ""
    Set objServices = GetObject("winmgmts:root\cimv2")

    ' Queryclusterservice
    Set objClusters = objServices.ExecQuery ("select * from win32_service where Name='ClusSvc' AND Started = TRUE")
    isEmpty = TRUE
    If Err.Number = 0 Then
        For each objCluster in objClusters
            isEmpty = FALSE
        Next
    End If

    Set objServices = Nothing
    Set objClusters = Nothing

    If isEmpty = TRUE Then
        strInstanceName = BuildInstanceName (".", strInstanceName)
        Exit Function
    End If

    ' Als we dit punt bereiken, betekent dit dat de machine een geclusterd knooppunt is.
    ' We bevragen het register om te bepalen of het SQL-exemplaar al dan niet geclusterd is.
    ' Zoek voor SQL 2000 de volgende waarde op
    ' HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\<InstanceName>\Cluster
    ' ClusterName
    strKey = "SOFTWARE\Microsoft\Microsoft SQL Server\" + strInstanceName + "\Cluster"
    GetRegValue "", HKEY_LOCAL_MACHINE, strKey, "ClusterName", strMacName, REG_SZ, b32bit

    If StrComp(strMacName, "") <> 0 Then
        strInstanceName = BuildInstanceName (strMacName, strInstanceName)
        Exit Function
    End If

    strKey = "SOFTWARE\Microsoft\" + strInstanceName + "\Cluster"
    GetRegValue "", HKEY_LOCAL_MACHINE, strKey, "ClusterName", strMacName, REG_SZ, b32bit

    If StrComp(strMacName, "") <> 0 Then
        strInstanceName = BuildInstanceName (strMacName, strInstanceName)
        Exit Function
    End If

    ' We proberen de registerwaarde op voor 2005/2008-exemplaren te zoeken
    'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL
    ' RegValue = InstanceName
    strInstID = ""
    strKey = "SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL"
    GetRegValue "", HKEY_LOCAL_MACHINE, strKey, strInstanceName, strInstID, REG_SZ, b32bit

    If StrComp(strInstID, "") = 0 Then
        ' Als deze sleutel niet bestaat, ga dan terug als een lokaal exemplaar van SQL 2000
        strInstanceName = BuildInstanceName (".", strInstanceName)
        Exit Function
    End If

    strKey = "SOFTWARE\Microsoft\Microsoft SQL Server\" + strInstID + "\Cluster"
    GetRegValue "", HKEY_LOCAL_MACHINE, strKey, "ClusterName", strMacName, REG_SZ, b32bit

    If StrComp(strMacName, "") = 0 Then
        strMacName = "."
    End If

    strInstanceName = BuildInstanceName (strMacName, strInstanceName)
End Function

Function BuildInstanceName (ByVal strMachineName, ByVal strInstanceName)
    Dim strPrefix

    strPrefix = ""
    If StrComp(strMachineName, ".") = 0 Then
        strPrefix = "lpc:"
    End If

    If strComp(UCase(strInstanceName), "MSSQLSERVER", 1) = 0 Then
        BuildInstanceName = strPrefix + strMachineName
    Else
        BuildInstanceName = strPrefix + strMachineName + "\" + strInstanceName
    End if
End Function