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AA-2008.0001                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                 Multiple browsers may allow SSL spoofing
                              2 January 2008
- ---------------------------------------------------------------------------

        AusCERT Advisory Summary
        ------------------------

Product:              Firefox 2.0
                      Safari 2
                      Konqueror 3.5.5 and 3.95.00
                      Mozilla 1.9 M8 and earlier
                      SeaMonkey 1.1.5
                      Netscape 9.0
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-6592 CVE-2007-6591 CVE-2007-6590
Member content until: Wednesday, January 30 2008

OVERVIEW

        Several browsers do not indicate when an SSL certificate applies to
        multiple hostnames via the subjectAltName:dNSName field [1],
        possibly making it easier for attackers to spoof SSL protected
        websites.

        The browsers affected include Mozilla-base browsers (eg, Firefox,
        Netscape and SeaMonkey), Apple Safari 2 and Konqueror. In the cases
        of Mozilla based browsers and Safari 2, the relevant fields can be
        found in the certificate details - Konqueror may not present this
        information at all.


IMPACT

        If a user is convinced to accept a certificate for a site and that
        certificate includes a wildcard subjectAltName:dNSName field, that
        certificate will be accepted for any domain that matches the
        wildcard without any indication to the user.


MITIGATION

        Users of Safari 2 and Mozilla based browsers can check the
        certificate's details for the subjectAltName:dNSName field before
        accepting or rejecting a site certificate.

        Users of Konqueror cannot check for this field.

        Users should be mindful of any SSL certificate prompts, and
        should not accept any invalid or self-signed certificates.


REFERENCES

        [1] National Vulnerability Database
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-6592
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-6591 
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-6590

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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