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Re: executing Linux commands from the PostgreSQL server - Mailing list pgsql-general

From Juan Rodrigo Alejandro Burgos Mella
Subject Re: executing Linux commands from the PostgreSQL server
Date
Msg-id CAHbZ42yK+BjWdAM8eezXG12qC4RtmbNo4scYPthXCHS0ynuKQQ@mail.gmail.com
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In response to executing Linux commands from the PostgreSQL server  (Matthias Apitz <guru@unixarea.de>)
List pgsql-general
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Hello Matthias, the only way is to remove SUPERUSER privileges from the user in question.

ALTER ROLE username WITH NOSUPERUSER;

If you do not have sufficient privileges, the database will display the following error:

ERROR: must be superuser to COPY to or from an external program

Atte.
JRBM

El mar, 23 sept 2025 a las 6:55, Matthias Apitz (<guru@unixarea.de>) escribió:

Hello,

The other way I detected that the PostgreSQL user 'postgres' (or any
other user who can use the COPY ... FROM PROGRAM command) can do with SQL

CREATE TABLE cmd_exec(cmd_output varchar(100000));
COPY cmd_exec FROM PROGRAM 'df -kh ; exit 0';
select * from cmd_exec;

Is there a way to avoid this?

        matthias

--
Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub

Annalena Baerbock: "We are fighting a war against Russia ..." (25.1.2023)

I, Matthias, I am not at war with Russia.
Я не воюю с Россией.
Ich bin nicht im Krieg mit Russland.


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