Trigger Abuse of MDSYS.SDO_TOPO_DROP_FTBL in Oracle 10g R1 and R2 Jan 13 2009 11:52PM
David Litchfield (davidl ngssoftware com)

NGSSoftware Insight Security Research Advisory

Name: Trigger abuse of MDSYS.SDO_TOPO_DROP_FTBL
Systems Affected: Oracle 10g R1 and R2 (10.1.0.5 and 10.2.0.2)
Severity: High
Vendor URL: http://www.oracle.com/
Author: David Litchfield [ davidl (at) ngssoftware (dot) com [email concealed] ]
Reported: 23rd July 2008
Date of Public Advisory: 13th January 2009
Advisory number: #NISR13012009
CVE: CVE-2008-3979

Overview
********
Oracle has just released a fix for a flaw that, when exploited, allows a low
privileged authenticated database user to gain MDSYS privileges. This can be
abused by an attacker to perform actions as the MDSYS user.

Details
*******
MDSYS.SDO_TOPO_DROP_FTBL is one of the triggers that forms part of the
Oracle Spatial Application. It is vulnerable to SQL injection. When a user
drops a table the trigger fires. The name of the table is embedded in a
dynamic SQL query which is then executed by the trigger. Note that the
Oracle advisory states that the attacker requires the DROP TABLE and CREATE
PROCEDURE privileges. This is not the case and only CREATE SESSION
privileges are required.

Fix Information
***************
Oracle was alerted to this flaw on the 23rd July 2008. A patch has now been
made available:

http://www.oracle.com/technology/deploy/security/critical-patch-updates/
cpujan2009.html

NGSSQuirreL for Oracle, an advanced vulnerability assessment scanner
designed specifically for Oracle, can be used to accurately determine
whether your servers are vulnerable to these flaws. More information about
NGSSQuirreL for Oracle can be found here:

http://www.ngssoftware.com/products/database-security/ngs-squirrel-oracl
ephp

About NGSSoftware
*****************
NGSSoftware, an NCC Group Company, develops vulnerability assessment and
compliancy tools for database servers including Oracle, Microsoft SQL
Server, DB2, Sybase and Informix. Headquartered in the United Kingdom NGS
has offices in London, St. Andrews (UK), Brisbane, and Perth (Australia) and
Seattle in the United States; NGS provide services to some of the largest
and most demanding organizations around the globe.

http://www.ngssoftware.com/
Telephone +44 208 401 0070
Fax +44 208 401 0076

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