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                         AUSCERT Security Bulletin

                              ASB-2009.1070.2
                        Opera version 10.0 released
                             3 September 2009

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

Product:              Opera
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Provide Misleading Information -- Remote/Unauthenticated
                      Reduced Security               -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-3049 CVE-2009-3048 CVE-2009-3047
                      CVE-2009-3046 CVE-2009-3045 CVE-2009-3044
Member content until: Friday, October  2 2009

Revision History:     September 3 2009: Added CVE References
                      September 2 2009: Initial Release

OVERVIEW

        Opera 10.0 has been released correcting multiple vulnerabilities.


IMPACT

        The vendor has provided the following information regarding the
        vulnerabilities that have been corrected in version 10.0:
        
        "Opera does not check the revocation status for intermediate 
        certificates not served by the server. If the intermediate is 
        revoked, this might not impact the security rating in Opera, and 
        the site might be shown as secure." [1]
        
        "Digital signatures made with the MD2 algorithm are used in some 
        of the issuer certificates that Opera trusts. MD2 is now 
        considered weak." [2]
        
        "The collapsed Address bar can in some cases temporarily show the 
        previous domain instead of the domain of the present site." [3]
        
        "Some Unicode characters are treated incorrectly, which might 
        cause international domain names that use them to be shown in the 
        wrong format. Showing these addresses in Unicode instead of 
        punycode could allow for limited address spoofing." [4]
        
        "Certificate authorities are expected to vet all certificate 
        registrations, but may fail to prevent fraudulent or erroneous 
        registrations. Certificates which use a wild card immediately 
        before the top level domain, or nulls in the domain name, may pass 
        validation checks in Opera. Sites using such certificates may then 
        incorrectly be presented as secure." [5]


MITIGATION

        Opera version 10.0 is available for download from the vendor's
        website. [6]


REFERENCES

        [1] Advisory: Sites using revoked intermediate certificates might be
            shown as secure
            http://www.opera.com/support/kb/view/929/

        [2] Advisory: MD2 algorithm used by security certificates is considered
            weak
            http://www.opera.com/support/kb/view/933/

        [3] Advisory: Address bar is not always updated correctly when
            collapsed
            http://www.opera.com/support/kb/view/930/

        [4] Advisory: Opera may show some incorrect characters in the address
            bar
            http://www.opera.com/support/kb/view/932/

        [5] Advisory: Opera accepts nulls and invalid wildcards in certificates
            http://www.opera.com/support/kb/view/934/

        [6] Download Opera browser
            http://www.opera.com/download

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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