ALTER LOGIN can enable, disable or rename a SQL Server login. I verify another administrative access path before changing sa.
The original example used sa and renamed it to AdminUser. A renamed sa login retains its built-in identity; its SID is 0x01. The read-only query below finds that account without assuming its current name.
-- Read-only: find the built-in administrator even if it was renamed.
SELECT name, is_disabled
FROM sys.server_principals
WHERE sid = 0x01;
-- Administrator templates. Ensure another approved administrator can connect first.
-- ALTER LOGIN [sa] DISABLE;
-- ALTER LOGIN [sa] ENABLE;
-- ALTER LOGIN [sa] WITH NAME = [AdminUser];The change statements are commented administrator templates. Review authentication mode and your organization’s account policy. Disabling a login prevents new connections, but does not automatically terminate an existing session.
Renaming an account is not a substitute for controlling authentication, passwords, privileges, and access. A familiar name alone is not the vulnerability.
Protect administrative access
Use individual approved accounts for routine work and verify the recovery access procedure before disabling a shared account. Avoid changing login names merely to follow an example.
Reference: ALTER LOGIN.
Renaming sa is not an access-control strategy, it is a name change for the same built-in identity.
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35 Comments. Leave new
Hello,
How do I find which Admin had disable/enabled a login in SQL 2005?
Thanks,
Abhilash
Hola.
Me di cuenta de algo bastante raro en sql server 2005 y necesito corroborarlo, porque me parece un bug de sql server 2005.
1.- Cree un login con la instruccion alter login …
2.- Luego lo cree como usuario en la BD que le corresponde con la instruccion CREATE USER ….
3.- Luego se me pidio hacer un SP ( stored procedure) , en donde los usuarios pudieran cambiar sus password ( contraseñas).
4.- Realice dicho SP, ocupando ALTER LOGIN …..
5.- Forme una instruccion dinamica, como sigue :
select @v_query = “ALTER LOGIN ” + @fld_cod_usu + ” WITH PASSWORD = ‘” + @fld_pas_new + “‘ OLD_PASSWORD = ‘” + @fld_pas_old + “‘”
y luego se executa como sigue :
EXECUTE sp_executesql @v_query
6.- Hasta aqui todo bien y de hecho funciona bien.
7.- La raro que descrubrí, haciendo pruebas, es que en sql server 2005 al crear el login por primera vez, éste tiene la capacidad de cambiar su contraseña, y la de CUALQUIER OTRO USUARIO. !!!!! uppsss
8.- Ante este escenario, le denegué el permiso de hacer eso vía la instruccion : deny alter any login to
9.- Esto a su vez implico, que el usuario ya no puede cambiar su clave, dado que es requisito segun sql servr 2005 que para ocupar alter login, se tenga el permiso de alter any login.
10.- Esto lo comprobé creando 3 usuarios desde la nada y SIN ocupar la intruccion grant alter any login al momento de la creacion.
El script exacto de la creacion del login para su revisión, es :
USE master
go
CREATE LOGIN [usu_003]
WITH PASSWORD=N’12345678’ ,
DEFAULT_DATABASE = db_cheq,
DEFAULT_LANGUAGE = us_english,
CHECK_EXPIRATION = OFF,
CHECK_POLICY = OFF
go
ALTER LOGIN [usu_003] ENABLE
go
GRANT CONNECT SQL TO [usu_003]
go
Esperando sus comentarios, atte claudiok.
sir u r the ultimate authoriy , wether microsoft itself unable to solve my problem.
thanks,
Great info Thanks
with apropos to Mr. Ranjeet, I completely agree !!! HatsOff !!!!!!
hi SIR,,PLS HELP ME VERY URGENT,,,,,I LOGGED IN INTO SSMS AND IN THE SECURITY TAB I MADE LOGIN DISABLE,,,,NOW I M TRYING TO OPEN DATEABASE IT IS SHOWING AN ERROR,,,LOGIN IS DISABLED,,,PLS HELP ME,,,I M NEW TO SQL
PLS HELP….
Sir, all the answers based on after connecting to Management Studio. What to do if the SQL server it self get disabled and preventing to connect to the Database. This is happening in my case sir. Pl. read.
Sir,
Our front end software which is in VB has disabled the SQL. Now i am unable to start Management Studio with my Administrator account or with any other logins. Because of this I am unable to get the data through tables directly. Our software makers deliberately did this to use their report generation menus from their front end software(VB) only. But I become handicapped because of this. For me the enabling/Disabling an user only possible after getting connected to Management Studio. In my case I cant get connected to Management Studio. I tried in different levels through services.msc etc. If I reinstall the SQL then I am able to connect but the problem starts after installation of our software. I feel that there might be a solution for this. The screen shot for the same is .Pl. give me a sollution.
Specifications:- Windows Server 2003 Service Pack 2, SQL 2008.
How do disable SA on SQL 2000?
How we can enable all the login in a single shot instead of doing one by one.
Want to Check the Log of the SA LOGIN ACCOUNT?
Script if any.
Thank you for the auspicious writeup. It in reality was once a entertainment account it. Glance advanced to more brought agreeable from you! However, how could we keep in touch?
hi mister,
i have this scenarios;
i need to disable certain users connecting to db
but allowing certain users connected.
can we do that?
tq.