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mysql -- GRANT access restriction problem

Description:

When a user is granted access to a database with a name containing an underscore and the underscore is not escaped then that user might also be able to access other, similarly named, databases on the affected system.

The problem is that the underscore is seen as a wildcard by MySQL and therefore it is possible that an admin might accidently GRANT a user access to multiple databases.

References:

Affects:

portaudit: mysql -- GRANT access restriction problem

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Oliver Eikemeier <eik@FreeBSD.org>