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                         AUSCERT Security Bulletin

                               ASB-2018.0152
                Security updates for Microsoft Skype & Lync
                               11 July 2018

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

Product:              Microsoft Skype for Business
                      Microsoft Lync
Operating System:     Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Remote with User Interaction
                      Denial of Service               -- Remote with User Interaction
                      Unauthorised Access             -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2018-8311 CVE-2018-8238 
Member content until: Friday, August 10 2018

OVERVIEW

        Microsoft has released its monthly security patch update for the month of July
        2018. [1]  This update resolves 2 vulnerabilities across the following
        products:
         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-2018-8238   Security Feature Bypass  Important
         CVE-2018-8311   Remote Code Execution    Important


MITIGATION

        Microsoft recommends updating the software with the version made available on
        the Microsoft Update Catalogue for the following Knowledge Base articles. [1]
        
        
         KB4022225, KB4022221


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.

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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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