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                         AUSCERT Security Bulletin

                               ASB-2010.0251
        A vulnerability has been identified in the ISC DHCP server
                             14 December 2010

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

Product:              ISC DHCP Server prior to 4.2.0-P2
Operating System:     Linux variants
                      BSD variants
                      Solaris
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2010-3616  
Member content until: Thursday, January 13 2011

OVERVIEW

        A vulnerability has been identified in the ISC DHCP server.


IMPACT

        The vendor has provided the following information regarding this
        vulnerability which has been assigned CVE-2010-3616:
        
        "If a TCP connection is established to the server on a port which has 
        been configured for communication with a failover peer, this can cause 
        it to become non-responsive to all normal DHCP protocol traffic. The 
        server will progress to a communications-interrupted state - but in 
        addition will also cease to provide DHCP services to clients. The 
        server must be restarted to resume normal operation." [1]


MITIGATION

        ISC has released updates to ISC DHCP Server to correct this issue. [1]


REFERENCES

        [1] DHCP: Server Hangs with TCP to Failover Peer Port
            https://www.isc.org/software/dhcp/advisories/cve-2010-3616

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.

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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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