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                         AUSCERT Security Bulletin

                              ASB-2009.1141.2
     Opera 10.10 has been released correcting multiple vulnerabilities
                             25 November 2009

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

Product:              Opera
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Execute Arbitrary Code/Commands -- Remote with User Interaction
                      Cross-site Scripting            -- Remote with User Interaction
                      Denial of Service               -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-4072 CVE-2009-4071 
Member content until: Thursday, December 24 2009

Revision History:     November 25 2009: Added CVE References
                      November 24 2009: Initial Release

OVERVIEW

        Opera 10.10 has been released correcting multiple vulnerabilities.


IMPACT

        The vendor has provided the following information regarding the
        vulnerabilities that have been corrected in version 10.10:
        
        Heap buffer overflow in string to number conversion:
        
        "Passing very long strings through the string to number 
        conversion using JavaScript in Opera may result in heap buffer 
        overflows. This also affects the dtoa routine, and was reported 
        in CVE-2009-0689. In most cases Opera will just freeze or 
        terminate, but in some cases this could lead to a crash which 
        could be used to execute code." [1]
        
        Error messages can leak onto unrelated sites
        
        "Scripting error messages are normally available only to the page 
        that caused the error. In some cases, the error messages could be 
        passed to other sites as the contents of unrelated variables, and 
        may contain sensitive information. If those sites write the 
        content into the page markup, this could allow cross-site 
        scripting, using code provided by the attacking site. This issue 
        only affects installations that have enabled stacktraces for 
        exceptions, these are disabled by default." [2]
        
        Unspecified Vulnerability
        
        "Fixed a moderately severe issue, as reported by Chris Evans of 
        the Google Security Team; details will be disclosed at a later 
        date." [3]


MITIGATION

        Opera version 10.10 is available for download from the vendor's
        website. [4]


REFERENCES

        [1] Advisory: Heap buffer overflow in string to number conversion
            http://www.opera.com/support/kb/view/942/

        [2] Advisory: Error messages can leak onto unrelated sites
            http://www.opera.com/support/kb/view/941/

        [3] Opera 10.10 (Opera Unite) for Windows changelog
            http://www.opera.com/docs/changelogs/windows/1010/

        [4] 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

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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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