IBM DB2 call buffer overflow (#NISR05012005C)

From: NGSSoftware Insight Security Research (nisr_at_NEXTGENSS.COM)
Date: 01/05/05

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    Date:         Wed, 5 Jan 2005 17:49:38 -0000
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    NGSSoftware Insight Security Research Advisory

    Name: IBM DB2 call buffer overflow
    Systems Affected: DB2 8.1/7.x
    Severity: High risk from remote
    Vendor URL: http://www.ibm.com/
    Author: David Litchfield [ david at ngssoftware.com ]
    Relates to: http://www.nextgenss.com/advisories/db2-02.txt
    Date of Public Advisory: 5th January 2005
    Advisory number: #NISR05012005C
    Advisory URL: http://www.ngssoftware.com/advisories/db205012005C.txt

    Description
    ***********
    IBM's DB2 database server suffers from a stack based buffer overflow
    vulnerability when using "call".

    Details
    *******
    Under DB2 it is possible to load a library directly and execute a function:

    call libname!function

    By passing an overly long libname it is possible to overflow a stack based
    buffer and overwrite the saved return address. When exploited this can allow
    an attacker to gain elevated privileges.

    Note 1) if an attacker can place an arbitrary library on the system (and
    there are ways to do this via DB2 and SQL) then there is no need to exploit
    this overflow. It is sufficient simply to create the library and export a
    function that takes no parameters.

    Note 2) "CREATE WRAPPERS" uses the same code as "CALL" and is presents
    another vector.

    Fix Information
    ***************
    IBM has written a patch and can be obtained with the latest fixpak.

    http://www-306.ibm.com/software/data/db2/udb/support/downloadv8.html - DB2
    v8.1
    http://www-306.ibm.com/software/data/db2/udb/support/downloadv7.html - DB2
    v7.x

    NGSSQuirreL for DB2 (http://www.nextgenss.com/db2.htm) can be used to assess
    whether your DB2 server is vulnerable to this.

    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/

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

    enquiries@ngssoftware.com 

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