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AA-2009.0105                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                        Firefox: Denial of Service
                               28 April 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              Firefox 3.0.9
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-1313
Member content until: Tuesday, May 26 2009

OVERVIEW:

      Mozilla has released one advisory relating to Firefox. Mozilla has rated 
      this advisory as "Critical" impact.


IMPACT:

      According to Mozilla, the vulnerabilty corrected in this update 
      is:

      o MFSA 2009-23 (CVE-2009-1313): "One of the security fixes in Firefox 
        3.0.9 introduced a regression that caused some users to experience 
        frequent crashes. Users of the HTML Validator add-on were particularly 
        affected, but other users also experienced this crash in some 
        situations. In analyzing this crash we discovered that it was due to 
        memory corruption similar to cases that have been identified as 
        security vulnerabilities in the past." [1]


MITIGATION:

      This vulnerability has been fixed in Firefox 3.0.10, which can be 
      downloaded from the Mozilla web site.


REFERENCES:

      [1] Mozilla Foundation Security Advisory 2009-23
          http://www.mozilla.org/security/announce/2009/mfsa2009-23.html

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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