sql injection union attack retrieving multiple values in a single column

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Retrieving multiple values within a single column

In the preceding example, suppose instead that the query only returns a single column.

You can easily retrieve multiple values together within this single column by concatenating the values together, ideally including a suitable separator to let you distinguish the combined values. For example, on Oracle you could submit the input:

' UNION SELECT username || '~' || password FROM users--

This uses the double-pipe sequence || which is a string concatenation operator on Oracle. The injected query concatenates together the values of the username and password fields, separated by the ~ character.

The results from the query will let you read all of the usernames and passwords, for example:

...
administrator~s3cure
wiener~peter
carlos~montoya
...

Note that different databases use different syntax to perform string concatenation. For more details, see the SQL injection cheat sheet.

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Not the best quality, but he did explained it very well! Thank you!

alexandercoen

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