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             AUSCERT External Security Bulletin Redistribution

          Microsoft Security Bulletin MS15-089: Vulnerability in
            WebDAV Could Allow Information Disclosure (3076949)
                              12 August 2015


        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: 

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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

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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