IBM DB2 libdb2.so buffer overflow (#NISR05012005B)

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

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    Date:         Wed, 5 Jan 2005 17:48:35 -0000
    To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM
    
    

    NGSSoftware Insight Security Research Advisory

    Name: IBM DB2 libdb2.so.1 buffer overflow
    Systems Affected: DB2 8.1/7.x
    Severity: High risk from local
    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: #NISR05012005B
    Advisory URL: http://www.ngssoftware.com/advisories/db205012005B.txt

    Description
    ***********
    libdb2.so.1, one of the libraries supplied with IBM's DB2 database server
    suffers from a buffer overflow vulnerability.

    Details
    *******
    This vulnerability can be divided into two separate issues. Firstly, when
    libdb2.so is loaded it reads the DBLPORT environment variable and copies the
    value to a buffer in the .bss section. This buffer is overflowed. By
    providing an overly long DB2LPORT environment variable it fills the
    db2MLNPort_name buffer in the .bss section of libdb2.so.1 - then spills over
    into the db2node_name buffer, into the instprof_path buffer, into the
    instance_path buffer and so on all the way into the install_path buffer.
    Secondly, when the sqloInstancePath() reads the install_path we overflow a
    local stack based buffer of sqloGetInstancePath().

    This can be exploited to gain root privileges. For example, db2cacpy is
    setuid root. This program loads the library and calls sqloInstancePath()
    overflowing the buffer.

    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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