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AA-2008.0075                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                  PowerDNS Cache Poisoning Vulnerability
                               1 April 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              PowerDNS Recursor 3.1.4 and earlier
Publisher:            PowerDNS
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Provide Misleading Information
Access:               Remote/Unauthenticated
Member content until: Tuesday, April 29 2008

OVERVIEW

        PowerDNS Recursor version 3.1.4 and earlier uses random number
        generation routines that are easily predictable[1][2] which may
        allow remote users to poison the DNS cache.


IMPACT

        Successful exploitation of this vulnerability could allow a
        remote attacker to redefine the IP address mappings for domain
        names, causing a denial of service or allowing more effective
        phishing attempts.


MITIGATION

        Users of PowerDNS Recursor should upgrade to version 3.1.5,
        which is not vulnerable to this issue.

        Very busy DNS servers may be less susceptible to attack,
        however they are still vulnerable.


REFERENCES

        [1] PowerDNS Security Advisory 2008-01
            http://doc.powerdns.com/powerdns-advisory-2008-01.html

        [2] PowerDNS Recursor DNS Cache Poisoning
            http://www.trusteer.com/docs/powerdnsrecursor.html

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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