[NEWS] ORACLE bfilename Function Buffer Overflow Vulnerability

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

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      ORACLE bfilename Function Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    Oracle's database server contains functions for use within queries. The
    bfilename() function returns a BFILE locator to a binary large object
    stored in the database. A vulnerability in the functions allows a remote
    attacker to overflow an internal buffer causing it to execute arbitrary
    code.

    DETAILS

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

    The bfilename() function suffers from a remotely exploitable buffer
    overrun when an overly long DIRECTORY parameter is supplied. 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 bfilename() 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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