On April 6, 2015, a bug bounty hunter named Stefan Horst published an SQL injection vulnerability that affected all the versions before Drupal 7.32.
The vulnerable query in Drupal is as follows:
db_query("SELECT * FROM {users} where name IN (:name)", array(':name'=>array('user1','user2')));This statement could be made vulnerable by converting it to the following:
SELECT * FROM users WHERE name IN (:name_test) -- , :name_test )The vulnerability results in dumping the whole of the database, modifying the data contained in it, or dropping the information.
Note
If you want to read more about the vulnerability, see the report at https://hackerone.com/reports/31756.