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                         AUSCERT Security Bulletin

                               ASB-2009.1055
       IBM NAS (Network Authentication Service) vulnerabilities for
                      DB2 V8.2, V9.1, v9.5 and V9.7.
                              19 August 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              IBM Network Authentication Service (NAS) for DB2 Version 8.2
                      IBM Network Authentication Service (NAS) for DB2 Version 9.1
                      IBM Network Authentication Service (NAS) for DB2 Version 9.5
                      IBM Network Authentication Service (NAS) for DB2 Version 9.7
Operating System:     AIX
                      Linux variants
                      Solaris
Impact/Access:        Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                      Denial of Service               -- Remote/Unauthenticated
                      Read-only Data Access           -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-0844 CVE-2009-0845 CVE-2009-0846
                      CVE-2009-0847  
Member content until: Friday, September 18 2009
Reference:            ESB-2009.0304
                      ESB-2009.0330
                      ESB-2009.0331
                      ESB-2009.0341

OVERVIEW

        Multiple vulnerabilities exist in the IBM Network Authentication Service
        (NAS) for DB2 Versions 8.2, 9.1, 9.5 and 9.7.  These vulnerabilities
        are present due to the use of the MIT krb5 implementation, and have 
        previously been patched in MIT krb5.


IMPACT

        According to the original MIT krb5 advisories [1][2], these 
        vulnerabilities may lead to denial of service conditions, 
        information leakage, or arbitrary code execution:
        
        "[CVE-2009-0844] An unauthenticated, remote attacker could cause a
        GSS-API application, including the Kerberos administration daemon
        (kadmind) to crash.  Under extremely unlikely conditions, there may be
        a theoretical possibility of a small information disclosure.
        
        [CVE-2009-0845] An unauthenticated, remote attacker could cause a
        GSS-API application, including the Kerberos administration daemon
        (kadmind) to crash.
        
        [CVE-2009-0847] An unauthenticated, remote attacker could cause a KDC
        or kinit program to crash." [1]
        
        
        "[CVE-2009-0846] An unauthenticated, remote attacker could cause a
        Kerberos application, including the Kerberos administration daemon
        (kadmind) or the KDC to crash, and possibly to execute arbitrary code.
        
        Compromise of the KDC or kadmind can compromise the Kerberos key
        database and host security on the KDC host.  (The KDC and kadmind
        typically run as root.)  We believe this scenario is highly unlikely,
        given the details of the vulnerability." [2]


MITIGATION

        Patches [3] have been made available by IBM to correct these
        vulnerabilities.


REFERENCES

        [1] MITKRB5-SA-2009-001
            http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2009-001.txt

        [2] MITKRB5-SA-2009-002
            http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2009-002.txt

        [3] Patches for IBM NAS for DB2
            https://www14.software.ibm.com/webapp/iwm/web/reg/pick.do?source=dm-nas&lang=en_US

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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