Oracle Database 11G PL/SQL Injection

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Digital Security Research Group [DSecRG] Advisory #DSECRG-09-003  
  
  
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  
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Oracle Database 11G vulnerable to PL/SQL Injection.  
  
Vulnerability found in Extended filter system (EXFSYS).  
  
  
  
Details  
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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:  
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exec EXFSYS.DBMS_EXPFIL_DR.GET_EXPRSET_STATS('EXFSYS','EXF$VERSION','EXFVER  
SION','YYYYYYY'' and 1=EVILPROC()--')  
  
  
  
Vulnerable Request in v$sql log file  
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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  
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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  
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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  
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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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