ASI Oracle Security Alert: Oracle Home Environment Variable Buffer Overflow

From: Aaron C. Newman (aaron@newman-family.com)
Date: Fri Nov 30 2001 - 12:40:45 PST

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    Oracle Home Environment Variable Buffer Overflow
    
    For additional details, the official advisories from Oracle
    Corporation can be downloaded from:
    http://otn.oracle.com/deploy/security/pdf/dbsmp_alert.pdf
    
    Summary:
    By setting a long ORACLE_HOME value (more than 750 bytes), an
    attacker can manipulate the dbsnmp executable to run tasks for them.
    Because the dbsnmp process runs setuid, this allows an attacker to
    elevate his or her privilege to the level of the oracle operating
    system account.
    
    Fix:
    Remove the setuid bit from the file (chmod -s dbsnmp) or apply the
    available patch which can be downloaded from
    http://metalink.oracle.com.
    
    Background:
    This vulnerability is based on the Oracle Enterprise Manager
    Intelligent Agent. This issue exists because the executable file for
    this process, dbsnmp, runs with the setuid bit enabled. That means
    this problems ONLY EXIST ON UNIX (OR LINUX) VERSIONS OF ORACLE. If
    you are not using the Intelligent Agent, you should remove the setuid
    bit from this process. You can also avoid this issue by restricting
    access to the Oracle operating system files. Only database
    administrators should have access to these files.
    
    The Oracle Intelligent Agent performs the following functions:
    - -Provides local services or calling operating system dependent
    services to interact locally with the managed targets.
    - -Checks for events, and queuing the resulting event reports for
    Oracle Enterprise Manager.
    - -Runs Oracle Enterprise Manager jobs, collecting their results and
    output, and/or queuing the results as required.
    - -Cancels jobs or events as directed by the Console or other
    applications.
    - -Handles requests to send SNMP traps for events if SNMP is supported
    on the Intelligent Agent's platform.
    
    
    Thank you,
    supportat_private
    Application Security, Inc.
    phone: 212-490-6022
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    www.appsecinc.com
    
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