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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS15-123: Important -- Security Update for
Skype for Business and Lync to Address Information Disclosure (3105872)
11 November 2015
AusCERT Security Bulletin Summary
Product: Microsoft Skype for Business
Operating System: Windows
Impact/Access: Reduced Security -- Remote with User Interaction
CVE Names: CVE-2015-6061
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Microsoft Security Bulletin MS15-123: Important -- Security Update for Skype
for Business and Lync to Address Information Disclosure (3105872)
Bulletin Number: MS15-123
Bulletin Title: Security Update for Skype for Business and Lync to Address
KB Article: 3105872
Published Date: November 10, 2015
This security update resolves a vulnerability in Microsoft Lync. The
vulnerability could allow information disclosure if an attacker invites a
target user to an instant message session and then sends that user a message
This security update is rated Critical for all supported editions of Skype
2016, Microsoft Lync 2013, and Microsoft Lync 2010; it is also rated Important
for certain Microsoft Lync Room System components. For more information, see
the Affected Software section.
Skype for Business 2016 (32-bit)
Skype for Business Basic 2016 (32-bit)
Skype for Business 2016 (64-bit)
Skype for Business Basic 2016 (64-bit)
Microsoft Lync 2013 Service Pack 1 (32-bit) (Skype for Business)
Microsoft Lync Basic 2013 Service Pack 1 (32-bit) (Skype for Business
Microsoft Lync 2013 Service Pack 1 (64-bit) (Skype for Business)
Microsoft Lync Basic 2013 Service Pack 1 (64-bit) (Skype for Business
Microsoft Lync 2010 (32-bit)
Microsoft Lync 2010 (64-bit)
Microsoft Lync 2010 Attendee (user level install)
Microsoft Lync 2010 Attendee (admin level install)
Microsoft Lync Room System (For SMART Room System)
Microsoft Lync Room System (For Crestron RL)
Before installing this update, you must have update 2965218 and security
update 3039779 installed. See the Update FAQ for more information.
This update is available from the Microsoft Download Center only.
Server Input Validation Security Feature Bypass Vulnerability - CVE-2015-6061
A security feature bypass vulnerability exists when Skype for Business and
Lync Servers improperly sanitize specially crafted content. An attacker who
content in the Skype for Business or Lync context. The attacker could use this
vulnerability to open a webpage using the default browser, open another
messaging session with a third party, or potentially trigger URIs that are
defined by other applications on the client's system.
To exploit the vulnerability an attacker could invite a target user to an
instant message session and then send that user a message containing specially
correcting how Skype for Business and Lync Servers sanitize content.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft
had not received any information to indicate that this vulnerability had been
publicly used to attack customers.
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