[Full-disclosure] TeamSHATTER Security Advisory: Buffer Overflow in Oracle Database (CTXSYS.DRVDISP.TABLEFUNC_ASOWN function)

[Shatter <shatter@xxxxxxxxxxxxx>]

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TeamSHATTER Security Advisory

October 20, 2011

Risk Level:
Medium

Affected versions:
Oracle Database Server version 10gR1, 10gR2 and 11gR1

Remote exploitable:
Yes (Authentication to Database Server is needed) 

Credits:
This vulnerability was discovered and researched by Esteban Martinez Fayo of 
Application Security Inc.

Details:
Oracle Database Server provides the CTXSYS.DRVDISP package that is part of 
Oracle Text component. This package contains the function TABLEFUNC_ASOWN which 
is vulnerable to buffer overflow attacks when it is called with a long string 
in their parameters.

Impact:
Any Oracle database user with EXECUTE privilege on CTXSYS.DRVDISP package (or 
with EXECUTE ANY PROCEDURE privilege) can exploit this vulnerability. 
Exploitation of this vulnerability allows an attacker to execute arbitrary 
code. It can also be exploited to cause DoS (Denial of service) killing the 
Oracle server process.

Vendor Status:
Vendor was contacted and a patch was released.

Workaround:
Restrict EXECUTE permissions on the vulnerable package CTXSYS.DRVDISP.

Fix:
Apply Oracle Critical Patch Update October 2011 available at Oracle Support.

CVE:
CVE-2011-2301

Links:
http://www.teamshatter.com/topics/general/team-shatter-exclusive/buffer-overflow-in-oracle-database-ctxsys-drvdisp-tablefunc_asown-function
http://www.oracle.com/technetwork/topics/security/cpuoct2011-330135.html

Timeline:
Vendor Notification - 5/31/2011
Vendor Response - 6/1/2011
Fix - 10/18/2011
Public Disclosure - 10/20/2011

Application Security, Inc's database security solutions have helped over 2000 
organizations secure their databases from all internal and external threats 
while also ensuring that those organizations meet or exceed regulatory 
compliance and audit requirements.

Disclaimer: The information in the advisory is believed to be accurate at the 
time of publishing based on currently available information. Use of the 
information constitutes acceptance for use in an AS IS condition. There are no 
warranties with regard to this information. Neither the author nor the 
publisher accepts any liability for any direct, indirect, or consequential loss 
or damage arising from use of, or reliance on, this information.
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