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                         AUSCERT Security Bulletin

                               ASB-2017.0088
               Skype for Business and Lync Security Updates
                               14 June 2017

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

Product:              Microsoft Skype for Business and Lync
Operating System:     Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2017-8527 CVE-2017-0283 
Member content until: Friday, July 14 2017

OVERVIEW

        Microsoft has released its monthly security patch update for the 
        month of June 2017 for Skype for Business and Lync. [1]
        
        This update resolves 2 vulnerabilities across the following
        products:
        
        Microsoft Lync 2010 (32-bit)
        Microsoft Lync 2010 (64-bit)
        Microsoft Lync 2010 Attendee (admin level install)
        Microsoft Lync 2010 Attendee (user level install)
        Microsoft Lync 2013 Service Pack 1 (32-bit)
        Microsoft Lync 2013 Service Pack 1 (64-bit)
        Skype for Business 2016 (32-bit)
        Skype for Business 2016 (64-bit)


IMPACT

        Microsoft has given the following details regarding these 
        vulnerabilities:
        
        Details		Impact			Severity
        CVE-2017-0283	Remote Code Execution	Critical
        CVE-2017-8527	Remote Code Execution	Critical


MITIGATION

        Microsoft recommends updating the software with the version 
        made available on the Microsoft Update Cataloge for the following 
        Knowledge Base articles. [1]
        
        KB3191939
        KB3203382
        KB4020732
        KB4020733
        KB4020734


REFERENCES

        [1] Security Update Guide
            https://portal.msrc.microsoft.com/en-us/security-guidance

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.

===========================================================================
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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