[VulnWatch] Oracle bfilename function buffer overflow vulnerability (#NISR16022003e)

From: NGSSoftware Insight Security Research (nisr@nextgenss.com)
Date: 02/18/03

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    From: "NGSSoftware Insight Security Research" <nisr@nextgenss.com>
    To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>, <ntbugtraq@listserv.ntbugtraq.com>
    Date: Mon, 17 Feb 2003 17:09:02 -0800
    
    

    NGSSoftware Insight Security Research Advisory

    Name: ORACLE bfilename function buffer overflow vulnerability
    Systems Affected: All platforms; Oracle9i Database Release 2, 9i Release 1,
    8i, 8.1.7, 8.0.6
    Severity: High Risk
    Category: Remote System Buffer Overrun
    Vendor URL: http://www.oracle.com
    Author: David Litchfield (david@ngssoftware.com)
    Date: 16th February 2003
    Advisory number: #NISR16022003e

    Description
    ***********
    Oracle's database server contains fuctions for use within queries. The
    bfilename() function returns a BFILE locator to a binary large object stored
    in the database.

    Details
    *******
    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 30th September 2002.
    Oracle has developed a patch which is available from

    http://otn.oracle.com/deploy/security/pdf/2003alert50.pdf

    A check for these issues has been added to NGSSQuirreL for Oracle, a
    comprehensive automated vulnerability assessment tool for Oracle Database
    Servers of which more information is available from the NGSSite

    http://www.ngssoftware.com/software/squirrelfororacle.html

    Further Information
    *******************
    For further information about the scope and effects of buffer overflows,
    please see

    http://www.ngssoftware.com/papers/non-stack-bo-windows.pdf
    http://www.ngssoftware.com/papers/ntbufferoverflow.html
    http://www.ngssoftware.com/papers/bufferoverflowpaper.rtf
    http://www.ngssoftware.com/papers/unicodebo.pdf

    About NGSSoftware
    *****************
    NGSSoftware design, research and develop intelligent, advanced application
    security assessment scanners. Based in the United Kingdom, NGSSoftware have
    offices in the South of London and the East Coast of Scotland. NGSSoftware's
    sister company NGSConsulting, offers best of breed security consulting
    services, specialising in application, host and network security
    assessments.

    http://www.ngssoftware.com/
    http://www.ngsconsulting.com/

    Telephone +44 208 401 0070
    Fax +44 208 401 0076

    enquiries@ngssoftware.com



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