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AUSCERT External Security Bulletin Redistribution
ESB-2015.2802
Microsoft Security Bulletin MS15-121 - Important: Security
Update for Schannel to Address Spoofing (3081320)
11 November 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Unauthorised Access -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6112
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-121
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Microsoft Security Bulletin MS15-121 - Important: Security Update for Schannel
to Address Spoofing (3081320)
Document Metadata
Bulletin Number: MS15-121
Bulletin Title: Security Update for Schannel to Address Spoofing
Severity: Important
KB Article: 3081320
Version: 1.0
Published Date: November 10, 2015
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow spoofing if an attacker performs a man-in-the-middle
(MiTM) attack between a client and a legitimate server.
This security update is rated Important for all supported releases of
Microsoft Windows excluding Windows 10. For more information, see the Affected
Software section.
Affected Software
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems Service Pack 1[1]
Windows 7 for x64-based Systems Service Pack 1[1]
Windows Server 2008 R2 for x64-based Systems Service Pack 1[1]
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1[1]
Windows 8 for 32-bit Systems[2]
Windows 8 for x64-based Systems[2]
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012[2]
Windows Server 2012 R2
Windows RT[3]
Windows RT 8.1[3]
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core
installation)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core
installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
installation)[1]
Windows Server 2012 (Server Core installation)[2]
Windows Server 2012 R2 (Server Core installation)
[1]Note that update 3101746 in MS15-115 and update 3101246 in MS15-122 are
releasing concurrently with update 3081320 in this bulletin, MS15-121.
Customers who intend to install all three updates manually on Windows 7
Service Pack 1 or Windows Server 2008 R2 Service Pack 1 should install the
updates in the following order: 3101246 first, 3081320 second, and 3101746
third (this is taken care of automatically for customers with automatic
updating enabled). For more information see the Known Issues section of
Microsoft Knowledge Base Article 3105256.
[2]Note that update 3101746 in MS15-115 and update 3101246 in MS15-122 are
releasing concurrently with update 3081320 in this bulletin, MS15-121.
Customers who intend to install all three updates manually on Windows 8 or
Windows Server 2012 should install the updates in the following order: 3101246
first, 3101746 second, and 3081320 third (this is taken care of automatically
for customers with automatic updating enabled). For more information see the
Known Issues section of Microsoft Knowledge Base Article 3105256.
[3]This update is only available via Windows Update.
Vulnerability Information
Schannel TLS Triple Handshake Vulnerability - CVE-2015-6112
A spoofing vulnerability exists in Microsoft Windows that is caused by a
weakness in all supported versions of the TLS protocol. An attacker who
successfully exploited this vulnerability could impersonate a victim on any
other server that uses the same credentials as those used between the client
and server where the attack is initiated.
To exploit the vulnerability an attacker would first have to perform a
man-in-the-middle (MiTM) attack between the client and a legitimate server.
The update addresses the vulnerability by adding extended master secret
binding support to all supported version of TLS.
This vulnerability has been publicly disclosed. It has been assigned Common
Vulnerability and Exposure number CVE-2015-6112. At the time this security
bulletin was originally issued, Microsoft was unaware of any attack attempting
to exploit this vulnerability.
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