User-Defined Functions in MySQL are used to extend the functionality by adding external code that will work the same as inbuilt functions. Certain versions of MySQL are affected by vulnerabilities that could allow attackers with database root access to execute code in the context of the MySQL process, which is often root, and escalate privileges.
https://steflan-security.com/linux-privilege-escalation-exploiting-user-defined-functions/
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from hacking: security in practice https://ift.tt/3jlAVzo
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