File: 100000166.txt

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Rule: 

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Sid: 
100000166

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Summary: 
This event is generated when a command is sent to an Oracle isqlplus instance 
which contains a command to halt the Oracle TNS listener service.

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Impact:
Vulnerable Oracle servers may shut down their TNS listener service upon receipt 
of this command, making the database unavailable for normal use until it is 
restarted.

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Detailed Information:
iSQLPlus is a web interface to the Oracle SQLPlus system. A wide range of 
commands may be sent to an Oracle server via this interface, including 
administrative commands. If a request is sent which contains a command to halt 
the TNS listener service, vulnerable versions of Oracle will execute the 
command, halting the service and denying service to legitimate users until the 
service is restarted.

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Affected Systems:
Oracle 9i Standard Edition 9.0.2.4
Oracle 9i Personal Edition 9.0.2.4
Oracle 9i Enterprise Edition 9.0.2.4

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Attack Scenarios:
A web browser may be used to exploit this vulnerability.

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Ease of Attack:
Simple, as a publicly available exploit exists which may be executed via a web 
browser.

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False Positives:
Any time an authorized administrator chooses to shut down the TNS listener 
service via the iSQLPlus interface.

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False Negatives:
None known.

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Corrective Action:
Apply the Oracle Critical Patch Update from July 2005, available at 
http://www.oracle.com/technology/deploy/security/pdf/cpujul2005.html.

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Contributors:
rmkml
Sourcefire Research Team

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Additional References

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