[NEWS] Oracle TO_TIMESTAMP_TZ Remote System Buffer Overrun

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

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Date: 17 Feb 2003 22:12:28 +0200

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      Oracle TO_TIMESTAMP_TZ Remote System Buffer Overrun
    ------------------------------------------------------------------------

    SUMMARY

    Oracle's database server contains functions for use within queries. The
    TO_TIMESTAMP_TZ function exists to convert a string into a timestamp with
    a time zone datatype. This function contains exploitable buffer overflow
    vulnerability.

    DETAILS

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

    There is a remotely exploitable buffer overflow vulnerability in the
    TO_TIMESTAMP_TZ function. A normal statement would look like the
    following, converting a character string to a value of timestamp with time
    zone:

    SELECT TO_TIMESTAMP_TZ('2003-02-016 12:00:00 -8:00','YYYY-MM-DD HH:MI:SS
    TZH:TZM') FROM DUAL;

    By supplying a long character string for the second parameter 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 and
    Oracle has produced 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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