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From: idlabs-advisories at idefense.com (idlabs-advisories@...fense.com) Subject: iDEFENSE Security Advisory 09.02.04a: Oracle Database Server dbms_system.ksdwrt Buffer Overflow Vulnerability Oracle Database Server dbms_system.ksdwrt Buffer Overflow Vulnerability iDEFENSE Security Advisory 09.02.04a www.idefense.com/application/poi/display?id=135&type=vulnerabilities September 2, 2004 I. BACKGROUND Oracle Database Server is a family of database products that range from personal databases to enterprise solutions. Further information is available at: http://www.oracle.com/database/index.html II. DESCRIPTION Remote exploitation of a buffer overflow vulnerability in Oracle Corp.'s Oracle Database Server could allow attackers to crash the server and potentially execute arbitrary code. The problem specifically exists within dbms_system.ksdwrt(), a function that allows writing messages to alert.log. If a long string is passed as the second argument to this function, a buffer overflow occurs. III. ANALYSIS Successful exploitation allows authorized remote users to cause the Oracle server process to crash and potentially execute arbitrary code. Authorized users include any users who are members of the SYS or SYSTEM roles, as well as users who are granted execute permissions on the dbms_system package. Successful exploitation of this vulnerability on Microsoft Corp.'s Windows platforms can lead to a full system compromise, as most systems are configured to run the Oracle service under Local System. Successful exploitation of this vulnerability on Linux/Unix platforms usually compromises only the database because the Oracle service runs under a non-privileged account. In cases where Oracle Internet Directory has been installed, an added exploitation vector exists. This is because Oracle Internet Directory creates a database user called ODSCOMMON that has a default password of ODSCOMMON which cannot be changed, thereby allowing any attacker to connect to the database server and exploit this vulnerability. IV. DETECTION The following versions of Oracle Database Server are affected: * Oracle 9i Database Server Release 2, versions 9.2.0.3 and 9.2.0.4 * Oracle 9i Database Server Release 1, versions 9.0.1.4 and 9.0.1.5 * Oracle 8i Database Server Release 1, version 8.1.7.4 Oracle 10g Database Server is not affected. V. WORKAROUND iDEFENSE is currently unaware of any workarounds that fully address this issue. VI. VENDOR RESPONSE "[This] issue [has] been addressed in Alert 68." http://www.oracle.com/technology/deploy/security/pdf/2004alert68.pdf VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2004-0638 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 05/06/2004 Initial vendor notification 05/06/2004 iDEFENSE clients notified 05/06/2004 Initial vendor response 09/02/2004 Public disclosure IX. CREDIT Alexander Kornbrust (www.red-database-security.com) is credited with this discovery. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp X. LEGAL NOTICES Copyright (c) 2004 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@...fense.com for permission. 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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