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                         AUSCERT Security Bulletin

                               ASB-2009.1048
   A new version of GnuTLS has been released correcting a vulnerability
                              13 August 2009

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

Product:              GnuTLS prior to 2.8.2
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Provide Misleading Information -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-2730  
Member content until: Saturday, September 12 2009

OVERVIEW

        A vulnerability has been identified in GnuTLS prior to version 2.8.2.


IMPACT

        The vendor has provided the following description of the vulnerability
        which has been assigned CVE-2009-2730:
        
        "By using a NUL byte in CN/SAN fields, it was possible to fool GnuTLS
        into 1) not printing the entire CN/SAN field value when printing a
        certificate and 2) cause incorrect positive matches when matching a
        hostname against a certificate.  Some CAs apparently have poor
        checking of CN/SAN values and issue these (arguable invalid)
        certificates.  Combined, this can be used by attackers to become a
        MITM on server-authenticated TLS sessions." [1]


MITIGATION

        The vendor recommends upgrading to the latest version of GnuTLS. [1]


REFERENCES

        [1] Announcement of GnuTLS v2.8.2
            http://article.gmane.org/gmane.network.gnutls.general/1733

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

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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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