IBM DB2 XML functions file creation vulnerabilities (#NISR05012005I)

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

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    Date:         Wed, 5 Jan 2005 17:54:36 -0000
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    NGSSoftware Insight Security Research Advisory

    Name: IBM DB2 XML functions file creation vulnerabilities
    Systems Affected: DB2 8.1
    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: #NISR05012005I
    Advisory URL: http://www.ngssoftware.com/advisories/db205012005I.txt

    Description
    ***********
    IBM's DB2 database server contain four XML functions that can be used to
    read and write files on the system.

    Details
    *******
    The XMLFileFromVarchar and XMLFileFromClob functions can be used to create
    files on the remote server. If the file exists the original is overwritten
    with the new content. The permissions of the account running DB2 is used and
    not that of the user. This vulnerability can be used to create executable
    binaries on the remote server as well. An attacker could create a library
    for example and then load it via "CALL".

    The XMLVarcharFromFile and XMLClobFromFile can be used to read files from
    the remote server.

    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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