How to query the mongoDB admin database?
As per your log statement you are getting the error message such as 

Error: error: { 
"$err" : "not authorized for query on admin.system.version", "code" : 13 
}


As github mongodb documentation here error_code("Unauthorized", 13).

As per MongoDB documentation here MongoDB grants access to data and commands through role-based authorization and provides built-in roles that provide the different levels of access commonly needed in a database system. You can additionally create user-defined roles.

A role grants privileges to perform sets of actions on defined resources. A given role applies to the database on which it is defined and can grant access down to a collection level of granularity.

You need to assign the read role or readWrite to the user.

For example :

Create Administrative User with Roles

use admin
db.createUser(
   {
     user: "appAdmin",
     pwd: "password",
     roles:
       [
         { role: "readWrite", db: "config" }

       ]
   }
)


For further your ref here, here and here