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                         AUSCERT Security Bulletin

                               ASB-2009.1015
                         Firefox 3.5 vulnerability
                               16 July 2009

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

Product:          Firefox 3.5
Operating System: UNIX variants (UNIX, Linux, OSX)
                  Windows
Impact/Access:    Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:       Mitigation
CVE Names:        CVE-2009-2477  

OVERVIEW

        Firefox 3.5 is vulnerable to a code execution vulnerability. [1,2]


IMPACT

        Firefox's Just-in-time (JIT) JavaScript compiler has a flaw which
        can be exploited by convincing the victim to view a malicious web
        page. [1, 2]


MITIGATION

        There is currently no patch available. The vendor recommends
        following the mitigation steps detailed on the Mozilla Security 
        Blog. [1]


REFERENCES

        [1] Mozilla Security Blog
            http://blog.mozilla.com/security/2009/07/14/critical-javascript-vulnerability-in-firefox-35/

        [2] Firefox 3.5 new exploit - confirmed
            http://isc.sans.org/diary.html?storyid=6796&rss

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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