Determine Salt used by MySQL in root'd server

[Voulnet <voulnet () gmail com>]

Hello folks, I'm doing a pentest on a server, and I got root access
through a Joomla web app, I got a dump of the jp_users table in MySQL,
however the passwords are obviously hashed and salted. I honestly
don't expect the passwords to be strong, so they can be bruteforced,
md5-looked up easily. However, how can I determine the salt value? I
already have root access on the server but I don't know where to look
in MySQL to find the salt value.

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