IBM DB2 SATADMIN.SATENCRYPT buffer overflow (#NISR05012005E)

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

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    Date:         Wed, 5 Jan 2005 17:51:29 -0000
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    NGSSoftware Insight Security Research Advisory

    Name: IBM DB2 SATADMIN.SATENCRYPT buffer overflow
    Systems Affected: DB2 8.1
    Severity: Medium 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: #NISR05012005E
    Advisory URL: http://www.ngssoftware.com/advisories/db205012005E.txt

    Description
    ***********
    IBM's DB2 database server, when configured for Satellite Administration
    includes a number of SQL functions. One of these, the SATENCRYPT function
    suffers from a stack based buffer overflow vulnerability.

    Details
    *******
    The SATENCRYPT function in the SATADMIN schema is vulnerable to a classic
    stack based overflow. The satencrypt function is exported by db2prom.dll and
    one of it's subfunctions creates a 40 byte buffer. User supplied data is
    copied to the buffer until a null terminator is reached in a while loop. By
    passing a parameter longer than 40 bytes allows the attacker to overflow the
    buffer and overwrite the saved return address. By exploiting this an
    attacker can gain elevated privileges.

    Note - by default, public cannot execute this function.

    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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