IBM DB2 Windows Permission Problems (#NISR05012005F)

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

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    Date:         Wed, 5 Jan 2005 17:52:11 -0000
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    NGSSoftware Insight Security Research Advisory

    Name: IBM DB2 Windows Permission Problems
    Systems Affected: DB2 8.1
    Severity: High risk from local
    Vendor URL: http://www.ibm.com/
    Author: Chris Anley [ chris at ngssoftware.com ]
    Relates to: http://www.ngssoftware.com/advisories/db2-02.txt
    Date of Public Advisory: 5th January 2005
    Advisory number: #NISR05012005F
    Advisory URL: http://www.ngssoftware.com/advisories/db205012005F.txt

    Description
    ***********

    Almost all shared memory sections and events in the Windows version of
    DB2 have weak permissions; all sections can be read and written by
    Everyone, and all events can be set and waited on by Everyone. This
    results in a number of security issues relating to the privileges of
    local users.

    Details
    *******

    The numbers below are NGS BUGID reference numbers mentioned in
    http://www.ngssoftware.com/advisories/db2-02.txt

    107) Depending on the server's authentication mode, any user can read
    plaintext windows usernames and passwords from the
    'DB2SHMSECURITYSERVICE' section. If the authentication mode is 'client',
    the username and password combinations for all client connections can be
    read from this section.

    The data in this section persists until another connection is made.

    108) Any user can shut down DB2, by setting the event named
    'DB2SHUTDOWNSEM'+ pid, for example

    DB2SHUTDOWNSEM000002ec

    109) Any user can DOS the "DB2 Security Server", by writing non-zero
    values to the section 'DB2SHMSECURITYSERVICE', followed by setting the
    security service 'input' event, to make the service read the input data:

    DB2NTSECURITYINPUT

    The service will then crash.

    110) Any user can read potentially sensitive query and/or query result
    data from a number of shared memory sections. The following sections are
    marked readable by 'Everybody'

    section read DB20QM
    section read DB2GLBQ0QM
    section read DB2SHMDB2_0APP
    section read DB2SHMDB2_0APL00000003
    section read DB2SHMDB2_0APL00000004
    section read DB2SHMDB2_0APL00000005
    ...etc

    111) After writing to the world-writeable section 'DB20QM':

    section write DB20QM

    ... the DB2 'command line processor' will not run, nor will the 'command
    center', the server has effectively been DOSsed.

    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.ngssoftware.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 

    --
NTBugtraq Editor's Note:
Most viruses these days use spoofed email addresses. As such, using an Anti-Virus product which automatically notifies the perceived sender of a message it believes is infected may well cause more harm than good. Someone who did not actually send you a virus may receive the notification and scramble their support staff to find an infection which never existed in the first place. Suggest such notifications be disabled by whomever is responsible for your AV, or at least that the idea is considered.
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