Digital Security Research Group [DSecRG] Advisory #DSECRG-09-003

2009-01-1600:00:00

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Application: Oracle database 11G
Versions Affected: Oracle 11.1.0.6 and 10.2.0.1
Vendor URL: http://oracle.com
Bugs: PL/SQL Injections
Exploits: YES
Reported: 17.11.2008
Vendor response: 18.11.2008
Last response: 24.11.2008
Date of Public Advisory: 13.01.2009
Authors: Alexandr Polyakov
Digital Security Research Group [DSecRG]
(research [at] dsec [dot] ru)

Description

Oracle Database 11G vulnerable to PL/SQL Injection.

Vulnerability found in Extended filter system (EXFSYS).

Details

PL/SQL Injection found in procedure EXFSYS.DBMS_EXPFIL_DR.GET_EXPRSET_STATS
(maybe other functions in this package)
Procedure EXFSYS.DBMS_EXPFIL_DR.GET_EXPRSET_STATS executes with rights of user
EXFSYS.

If Attacker have access to EXFSYS.DBMS_EXPFIL_DR.GET_EXPRSET_STATS. he can do
all things with EXFSYS user rights;
By default user EXFSYS have privelege "CREATE LIBRARY" and "CREATE ANY
TRIGGER". So he teoretically can get access to OS.

it can only be exploited by an attacker who is either running as a privileged
users, e.g. as EXFSYS
or SYS, or on a system where access to the EXFSYS routines has been granted to
unprivileged users so this a
defense in depth issue.

EXFSYS.DBMS_EXPFIL_DR.GET_EXPRSET_STATS has 4 parameters

TAB_OWNER
TAB_NAME
EXP_COLUMN
ASET_NM

"ASET_NM" is vulnerable to SQL Injection

Example:

exec EXFSYS.DBMS_EXPFIL_DR.GET_EXPRSET_STATS('EXFSYS','EXF$VERSION','EXFVER
SION','YYYYYYY'' and 1=EVILPROC()–')

Vulnerable Request in v$sql log file

SELECT attribute, data_type from ADM_EXPFIL_ATTRIBUTES where owner = 'EXFSYS'
and
attribute_set_name = 'YYYYYYY' and EVILPROC()=EVILPROC()–' and table_alias =
'NO' and (data_type like 'VARCHAR(%)' or data_type like 'VARCHAR2(%)'
or data_type = 'INT' or data_type = 'INTEGER' or data_type = 'NUMBER' or
data_type = 'DATE')

Fix Information

This is Security-In-Depth
vulnerability.(http://www.oracle.com/technology/deploy/security/cpu/cpufaq.htm)
Vulnerability issues that result in significant modification of Oracle code or
documentation in future releases,
but are not of such a critical nature that they are distributed in Critical
Patch Updates.

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

Credits

Oracle give a credits for Alexander Polyakov from Digital Security Company in
Security-In-Depth program of CPU January 2009.

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

About

Digital Security is leading IT security company in Russia, providing information
security consulting, audit and penetration testing services, risk analysis and
ISMS-related services and certification for ISO/IEC 27001:2005 and PCI DSS
standards. Digital Security Research Group focuses on web application and
database security problems with vulnerability reports, advisories and whitepapers
posted regularly on our website.

Contact: research [at] dsec [dot] ru
http://www.dsecrg.ru
http://www.dsec.ru

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