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                         AUSCERT Security Bulletin

                               ASB-2020.0077
               Security update for Microsoft Developer Tools
                               15 April 2020

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

Product:              Microsoft Developer Tools
Operating System:     Windows
Impact/Access:        Increased Privileges      -- Existing Account      
                      Overwrite Arbitrary Files -- Existing Account      
                      Reduced Security          -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2020-1026 CVE-2020-0900 CVE-2020-0899
Member content until: Friday, May 15 2020

OVERVIEW

        Microsoft has released its monthly security patch update for the month 
        of April 2020.
        
        This update resolves 3 vulnerabilities across the following products: [1]
        
         Microsoft Research JavaScript Cryptography Library V1.4
         Microsoft Visual Studio 2015 Update 3
         Microsoft Visual Studio 2017 version 15.9 (includes 15.1 - 15.8)
         Microsoft Visual Studio 2019 version 16.0
         Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)
         Microsoft Visual Studio 2019 version 16.5


IMPACT

        Microsoft has given the following details regarding these vulnerabilities.
        
         Details         Impact                   Severity
         CVE-2020-0899   Elevation of Privilege   Important
         CVE-2020-0900   Elevation of Privilege   Important
         CVE-2020-1026   Security Feature Bypass  Important


MITIGATION

        Microsoft recommends updating the software with the version made available 
        on the Microsoft Update Catalogue for the following Knowledge Base articles. 
        [1]
        
         KB4540102


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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