Penetration Test - PHP / APACHE

Ok,

Im doing a pen-test for a client-

I have found the application to be running on 
Apache 1.3 with a SQL Backend-

I was able to download the .inc file with the admin username and password..

The only problem is that the database is conifgured with "localhost" so I cant 
connect with a database client remotely- ( Expected this in a DMZ )

What are attack vectors are possible once obtaining the SQL user and pass?

I thinking that this is a SQL only system so the credentials wouldnt work on 
any other services ( FTP , etc )

Any ideas Appreciated,

Larry

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