[NEWS] Oracle TZ_OFFSET Remote System Buffer Overrun

From: support@securiteam.com
Date: 02/17/03

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Date: 17 Feb 2003 22:18:05 +0200

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      Oracle TZ_OFFSET Remote System Buffer Overrun
    ------------------------------------------------------------------------

    SUMMARY

    Oracle's database server contains functions for use within queries. The
    TZ_OFFSET function returns the time zone offset corresponding to the value
    entered based on the date the statement was executed. For example:
    SELECT TZ_OFFSET('US/Eastern') FROM DUAL;
    Would return the time zone offset value of -04:00. The TZ_OFFSET()
    function contains a remotely exploitable buffer overflow vulnerability.

    DETAILS

    Vulnerable systems:
     * All platforms; Oracle9i Database Release 2, 9i Release 1, 8i, 8.1.7,
    8.0.6

    There exists a remotely exploitable buffer overflow vulnerability in the
    TZ_OFFSET function. By supplying a long string of characters for the time
    zone name, an attacker can overwrite a saved return address on the stack
    of Oracle process. Before this issue can be exploited an attacker must be
    able to log on to the database server with a valid user ID and password,
    but as the TO_TIMESTAMP_TZ() function can be executed by PUBLIC by default
    any user of the system can gain control. Any arbitrary code supplied by an
    attacker would execute with the same privileges as the user running the
    service; this account is typically "Oracle" on Linux/UNIX based platforms
    and Local System on Windows based operating systems such as NT/2000/XP. As
    such, this allows for a complete compromise of the data stored in the
    database and possibly a complete compromise of the operating system.

    Fix Information:
    NGSSoftware alerted Oracle to this vulnerability on 30 September 2002.
    Oracle has developed a patch that is available from
     <http://otn.oracle.com/deploy/security/pdf/2003alert50.pdf>
    http://otn.oracle.com/deploy/security/pdf/2003alert50.pdf

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nisr@nextgenss.com>
    NGSSoftware Insight Security Research.

    ========================================

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