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                         AUSCERT Security Bulletin

                              ASB-2009.1097.2
                         avast! 4.8.1356 released
                              2 October 2009

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

Product:              avast! Home/Professional
Operating System:     Windows
Impact/Access:        Increased Privileges -- Existing Account
                      Denial of Service    -- Existing Account
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-3524 CVE-2009-3523 CVE-2009-3522
Member content until: Wednesday, October 28 2009

Revision History:     October    2 2009: Added CVE References
                      September 28 2009: Initial Release

OVERVIEW

        avast! have released Home/Professional version 4.8.1356 correcting a 
        number of security vulnerabilities.


IMPACT

        The vendor has provided the following information regarding these
        vulnerabilities [1]:
        
          * solved a memory leak in the GZIP unpacker
          * solved vulnerabilities in AavmKer4.sys, aswMon2.sys and 
            ashWsFtr.dll
        
        Exploit code for some of these vulnerabilities had been made public.
        AusCERT confirmed the exploit code relating to the aswMon2.sys 
        vulnerability was able to cause a denial of service.


MITIGATION

        Users can update to the latest version to correct these issues.


REFERENCES

        [1] avast! 4 Home/Professional Revision History
            http://www.avast.com/eng/avast-4-home_pro-revision-history.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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