The Background I was trying to solve the fourth realistic mission in hackthissite.org, and couldn't figure out exactly what SQL I should inject into the URL to retrieve the list of emails.
UNION ALL Syntax. The UNION operator selects only distinct values by default. To allow duplicate values, use UNION ALL: SELECT column_name(s) FROM table1 UNION ALL SELECT
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
Используйте NULL в UNION-инъекциях вместо попыток угадать строку, дату, число и прочее. Но будьте аккуратны при слепой инъекции, т.к. вы
Note: A NULL value is different from a zero value or a field that contains spaces.
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
found 4477 results in all patches.
SET CONCAT_NULL_YIELDS_NULL must be ON when creating or altering indexed views, indexes on computed columns, filtered indexes or spatial indexes. If SET CONCAT_NULL_YIELDS_NULL is OFF, any CREATE, UPDATE, INSERT, and DELETE statements on tables with indexes on computed...
Первая из них – CONCAT – возвращает NULL, если среди аргументов функции встречается NULL, вторая – CONCAT_WS – опускает аргумент, если его значение NULL. Кроме того, эта функция первым аргументом имеет разделитель, используемый при конкатенации.