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AA-2008.0074                  AUSCERT Advisory

                                   [Win]
          avast! 4 contains local system compromise vulnerability
                               4 April 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              avast! 4 prior to 4.8.1169
Operating System:     Windows
Impact:               Administrator Compromise
                      Denial of Service
Access:               Existing Account
CVE Names:            CVE-2008-1625
Member content until: Tuesday, April 29 2008

Revision History:  April  4 2008: Added CVE information
                   April  1 2008: Initial Release

OVERVIEW

        avast! 4 before version 4.8.1169[1] contains a vulnerability in
        its aavmker4.sys kernel driver that could allow local attackers
        to execute arbitrary code as SYSTEM or cause a denial of service.


IMPACT

        A logged in user could send a specially crafted IOCTL request to
        the affected kernel driver to cause a system crash or execute
        arbitrary code with SYSTEM privileges[2].


MITIGATION

        Users of avast! 4 should upgrade to version 4.8.1169.


REFERENCES


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

        [2] TrapKit TKADV2008-002
            http://www.trapkit.de/advisories/TKADV2008-002.txt

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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