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SQL Injection Cookbook - MSSQL
Last revision (yyyy-mm-dd): 2016-07-31
Comment: The second half of this page should be reviewed and finalized.
Database objects
Tables
List table names
List columns for a specific table
View table permissions
Change table permissions
Create a table
Stored procedures or functions
List stored procedures or functions
Parameters for a stored procedure or function
Source code of a stored procedure or function
Create a stored procedure or function
System data
Users
Identify current user
List of database users
List of database administrators
Database user permissions
Create a new user
Change a user password
Delete a user
Database server
View database server settings
Change database server settings
View database server processes
Kill database server process
Host Operating System
Operating System version
OS environment variables
Execute OS shell command
Read file contents
Arbitrary file writes
File uploads
Queries
Strings
Valid string delimiters
String concatenation
String-based queries with no quote characters
Query syntax
Result row count limiters
Acceptable whitespace
Tableless queries
Query comments
Command delimiters
Set operators
Set operators are used to combine the results from two different queries. The number of columns and order of column types must be identical for both queries. The general syntax is
SELECT
fname, lname
FROM
employees
SET_OPERATOR
SELECT
fname, lname
FROM
customers
Special queries
Single column queries
Single row queries
Functions, etc.
Data type casting
Query output to file
Attacks
Breaking out of a query
WHERE clauses
FROM clauses
Other parts of a SELECT
INSERT statements
UPDATE statements
Inference and timing attacks
SQL Tautologies
A tautology is something that is inherently true. SQL tautologies are used when you want to force a query to return all results, basically ignoring any WHERE conditionals. Simple tautologies like " OR 1=1" are useful, but may be filtered out by some security tools. The table below offers a number of tautologies that filter writers (even on well known commercial tools) may not have considered.
| Statement | Numeric
(1 = 1) |
String
('a' = 'a') |
Binary
(0x1 = 0x1) |
|---|---|---|---|
| a = a | X | X | X |
