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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
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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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