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AUSCERT External Security Bulletin Redistribution
ESB-2015.2074
Microsoft Security Bulletin MS15-089: Vulnerability in
WebDAV Could Allow Information Disclosure (3076949)
12 August 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-2476
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-089
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Microsoft Security Bulletin MS15-089: Vulnerability in WebDAV Could Allow
Information Disclosure (3076949)
Bulletin Number: MS15-089
Bulletin Title: Vulnerability in WebDAV Could Allow Information Disclosure
Severity: Important
KB Article: 3076949
Version: 1.0
Published Date: August 11, 2015
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow information disclosure if an attacker forces an
encrypted Secure Socket Layer (SSL) 2.0 session with a WebDAV server that has
SSL 2.0 enabled and uses a man-in-the-middle (MiTM) attack to decrypt portions
of the encrypted traffic.
This security update is rated Important for all supported releases of
Microsoft Windows except Itanium servers and Windows 10, which are not
affected. For more information, see the Affected Software section.
Affected Software
Windows Vista
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2[1]
Windows Server 2008 for x64-based Systems Service Pack 2[1]
Windows 7
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1[1]
Windows 8 and Windows 8.1
Windows 8 for 32-bit Systems
Windows 8 for x64-based Systems
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012[1]
Windows Server 2012 R2[1]
Windows RT and Windows RT 8.1
Windows RT[2]
Windows RT 8.1[2]
[1]Servers are affected only if Desktop Experience is installed.
[2]This update is available via Windows Update only.
Vulnerability Information
WebDAV Client Information Disclosure Vulnerability - CVE-2015-2476
An information disclosure vulnerability exists in the Microsoft Web
Distributed Authoring and Versioning (WebDAV) client that is caused when it
explicitly allows the use of Secure Socket Layer (SSL) 2.0. An attacker who
successfully exploited this vulnerability could decrypt portions of encrypted
traffic.
To exploit the vulnerability, an attacker could force an encrypted SSL 2.0
session with a WebDAV server that has SSL 2.0 enabled and use a
man-in-the-middle (MiTM) attack to decrypt portions of the encrypted traffic.
The security update addresses the vulnerability by ensuring that the Microsoft
WebDAV client defaults to more secure protocols than SSL 2.0.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally issued
Microsoft had not received any information to indicate that this vulnerability
had been publicly used to attack customers.
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