MS15-089: Vulnerability in WebDAV could allow security feature bypass: August 11, 2015

Applies To
Windows Server 2012 R2 Datacenter Windows Server 2012 R2 Standard Windows Server 2012 R2 Essentials Windows Server 2012 R2 Foundation Windows 8.1 Enterprise Windows 8.1 Pro Windows 8.1 Windows RT 8.1 Windows Server 2012 Datacenter Windows Server 2012 Datacenter Windows Server 2012 Standard Windows Server 2012 Standard Windows Server 2012 Essentials Windows Server 2012 Foundation Windows Server 2012 Foundation Windows 8 Enterprise Windows 8 Pro Windows 8 Windows RT Windows Server 2008 R2 Service Pack 1 Windows Server 2008 R2 Datacenter Windows Server 2008 R2 Enterprise Windows Server 2008 R2 Standard Windows Server 2008 R2 Web Edition Windows Server 2008 R2 Foundation Windows 7 Service Pack 1 Windows 7 Ultimate Windows 7 Enterprise Windows 7 Professional Windows 7 Home Premium Windows 7 Home Basic Windows 7 Starter Windows Server 2008 Service Pack 2 Windows Server 2008 Datacenter Windows Server 2008 Enterprise Windows Server 2008 Standard Windows Server 2008 Web Edition Windows Server 2008 Foundation Windows Vista Service Pack 2 Windows Vista Ultimate Windows Vista Enterprise Windows Vista Business Windows Vista Home Premium Windows Vista Home Basic Windows Vista Starter

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 and uses a man-in-the-middle (MiTM) attack to decrypt parts of the encrypted traffic. To learn more about the vulnerability, see Microsoft Security Bulletin MS15-089.

More Information

Important

  • All future security and nonsecurity updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.
  • If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update is downloaded and installed automatically. For more information about how to turn on automatic updating, see Get security updates automatically.

Note For Windows RT and Windows RT 8.1, this update is available through Windows Update only.

Method 2: Microsoft Download Center

You can obtain the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

Click the download link in Microsoft Security Bulletin MS15-089 that corresponds to the version of Windows that you are running.

More Information

Security update deployment information

Windows Vista (all editions)Reference table

The following table contains the security update information for this software.

Security update file names For all supported 32-bit editions of Windows Vista:
Windows6.0-KB3076949-x86.msu
For all supported x64-based editions of Windows Vista:
Windows6.0-KB3076949-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates.
File information See the file information section.
Registry key verification Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 (all editions)Reference table

The following table contains the security update information for this software.

Security update file names For all supported 32-bit editions of Windows Server 2008:
Windows6.0-KB3076949-x86.msu
For all supported x64-based editions of Windows Server 2008:
Windows6.0-KB3076949-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates.
File information See the file information section.
Registry key verification Note A registry key does not exist to validate the presence of this update.

Windows 7 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name For all supported 32-bit editions of Windows 7:
Windows6.1-KB3076949-x86.msu
For all supported x64-based editions of Windows 7:
Windows6.1-KB3076949-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, and then click System and Security. Under Windows Update, click View installed updates, and then select from the list of updates.
File information See the file information section.
Registry key verification Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 R2 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name For all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB3076949-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, and then click System and Security. Under Windows Update, click View installed updates, and then select from the list of updates.
File information See the file information section.
Registry key verification Note A registry key does not exist to validate the presence of this update.

Windows 8 and Windows 8.1 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name For all supported 32-bit editions of Windows 8:
Windows8-RT-KB3076949-x86.msu
For all supported x64-based editions of Windows 8:
Windows8-RT-KB3076949-x64.msu
For all supported 32-bit editions of Windows 8.1:
Windows8.1-KB3076949-x86.msu
For all supported x64-based editions of Windows 8.1:
Windows8.1-KB3076949-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File information See the file information section.
Registry key verification Note A registry key does not exist to validate the presence of this update.

Windows Server 2012 and Windows Server 2012 R2 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name For all supported editions of Windows Server 2012:
Windows8-RT-KB3076949-x64.msu
For all supported editions of Windows Server 2012 R2:
Windows8.1-KB3076949-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File information See the file information section.
Registry key verification Note A registry key does not exist to validate the presence of this update.

Windows RT and Windows RT 8.1 (all editions)Reference table

The following table contains the security update information for this software.

Deployment These updates are available through Windows Update only.
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.
Removal information Click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates.
File information See the file information section.

      

File hash information
File name SHA1 hash SHA256 hash
Windows6.1-KB3076949-x86.msu 534060F9BDDB4DBA2C47CD36B9F277369ECD8BEB 9D21818913DBFD1E56C6CBAAEC19F6F67458EE0DE9EE61220E29FC446A66AC78
Windows8.1-KB3076949-arm.msu BD921E99258E1001ECC3CD023E7651CE43B8EAE8 9357135F6BAEA8A15D53A0A065E42B0E1DE462C917446793A544219190FD4E91
Windows8-RT-KB3076949-arm.msu D944FAA57AB33A8DA53219CD2DBA411D714A24FA F04864D34A5161F35E81E5208600C3420EE26EA574C3BCBE9106E21D36F0BFD1
Windows6.1-KB3076949-x86.msu 534060F9BDDB4DBA2C47CD36B9F277369ECD8BEB 9D21818913DBFD1E56C6CBAAEC19F6F67458EE0DE9EE61220E29FC446A66AC78
Windows6.1-KB3076949-x64.msu 13CB56A9879CA98D6644E8357B3FC52C9ACFB785 3359638FE3CF59FF4332B2490339050EAEA2368EA1F64AB21838C6E60DB4165D
Windows8-RT-KB3076949-x86.msu 3E0BA36FDCB0911C66C557C7C1A55877490525DF 0C31DAE892AA39FEF310961CF74C8886AB68E601BD842914C487E7A851C5679F
Windows8-RT-KB3076949-x64.msu 8DADDA02FA80E8F642C9BE33DF88157428AEEC96 A188E2BC097756C475BD73A5EFE2A918483BFB4B7865CCE293DFCBAD94EB21D2
Windows8.1-KB3076949-x86.msu BAF4582CF62D5627116FB7193A567FB5445CDB00 05A201ABEFC62D07110DCC015FAEBF6B0F329CD2C5334E25A80A147661C5AF27
Windows8.1-KB3076949-x64.msu B9FAE4CFC9E1B64B612BF9844119ED40747A2DB6 47F67969EC66F81AA6BB305174E63F6283A3CB033AD5A041CFFD40319EB95D0B
Windows8-RT-KB3076949-arm.msu D944FAA57AB33A8DA53219CD2DBA411D714A24FA F04864D34A5161F35E81E5208600C3420EE26EA574C3BCBE9106E21D36F0BFD1
Windows8.1-KB3076949-arm.msu BD921E99258E1001ECC3CD023E7651CE43B8EAE8 9357135F6BAEA8A15D53A0A065E42B0E1DE462C917446793A544219190FD4E91
Windows6.0-KB3076949-x86.msu BA127E74BA7EDD3863CDE512B855706C807EDB2C 2F2353437CF36625C051DAF991ED9DB7272C1A225F1789B6E643FD4B457B7C07
Windows6.0-KB3076949-x86.msu BA127E74BA7EDD3863CDE512B855706C807EDB2C 2F2353437CF36625C051DAF991ED9DB7272C1A225F1789B6E643FD4B457B7C07
Windows6.0-KB3076949-x64.msu 70EB7E27870702D8629BD3DF15B353F277398B83 F3930CB112A0783F7AEC3C9458C534F38A80C8398742C475FFBF7C0857C0C7E3
Windows6.0-KB3076949-x64.msu 70EB7E27870702D8629BD3DF15B353F277398B83 F3930CB112A0783F7AEC3C9458C534F38A80C8398742C475FFBF7C0857C0C7E3
Windows6.1-KB3076949-x64.msu 13CB56A9879CA98D6644E8357B3FC52C9ACFB785 3359638FE3CF59FF4332B2490339050EAEA2368EA1F64AB21838C6E60DB4165D
Windows6.1-KB3076949-x64.msu 13CB56A9879CA98D6644E8357B3FC52C9ACFB785 3359638FE3CF59FF4332B2490339050EAEA2368EA1F64AB21838C6E60DB4165D
Windows8-RT-KB3076949-x64.msu 8DADDA02FA80E8F642C9BE33DF88157428AEEC96 A188E2BC097756C475BD73A5EFE2A918483BFB4B7865CCE293DFCBAD94EB21D2
Windows8-RT-KB3076949-x86.msu 3E0BA36FDCB0911C66C557C7C1A55877490525DF 0C31DAE892AA39FEF310961CF74C8886AB68E601BD842914C487E7A851C5679F
Windows8-RT-KB3076949-x64.msu 8DADDA02FA80E8F642C9BE33DF88157428AEEC96 A188E2BC097756C475BD73A5EFE2A918483BFB4B7865CCE293DFCBAD94EB21D2
Windows8-RT-KB3076949-x86.msu 3E0BA36FDCB0911C66C557C7C1A55877490525DF 0C31DAE892AA39FEF310961CF74C8886AB68E601BD842914C487E7A851C5679F
Windows8.1-KB3076949-x64.msu B9FAE4CFC9E1B64B612BF9844119ED40747A2DB6 47F67969EC66F81AA6BB305174E63F6283A3CB033AD5A041CFFD40319EB95D0B
Windows8.1-KB3076949-x86.msu BAF4582CF62D5627116FB7193A567FB5445CDB00 05A201ABEFC62D07110DCC015FAEBF6B0F329CD2C5334E25A80A147661C5AF27
Windows8.1-KB3076949-x86.msu BAF4582CF62D5627116FB7193A567FB5445CDB00 05A201ABEFC62D07110DCC015FAEBF6B0F329CD2C5334E25A80A147661C5AF27
Windows8.1-KB3076949-x64.msu B9FAE4CFC9E1B64B612BF9844119ED40747A2DB6 47F67969EC66F81AA6BB305174E63F6283A3CB033AD5A041CFFD40319EB95D0B
Windows6.0-KB3076949-x86.msu BA127E74BA7EDD3863CDE512B855706C807EDB2C 2F2353437CF36625C051DAF991ED9DB7272C1A225F1789B6E643FD4B457B7C07
Windows6.0-KB3076949-x64.msu 70EB7E27870702D8629BD3DF15B353F277398B83 F3930CB112A0783F7AEC3C9458C534F38A80C8398742C475FFBF7C0857C0C7E3

      

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

Windows Vista and Windows Server 2008 file information

  • The files that apply to a specific product, milestone (SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version Product Milestone Service branch
    6.0.6002.18xxx Windows Vista SP2 and Windows Server 2008 SP2 SP2 GDR
    6.0.6002.23xxx Windows Vista SP2 and Windows Server 2008 SP2 SP2 LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x86-based versions of Windows Vista and Windows Server 2008

File name File version File size Date Time Platform
Webclnt.dll 6.0.6002.19433 199,680 01-Jul-2015 15:57 x86
Webclnt.dll 6.0.6002.23739 199,680 01-Jul-2015 15:31 x86

For all supported x64-based versions of Windows Vista and Windows Server 2008

File name File version File size Date Time Platform
Webclnt.dll 6.0.6002.19433 218,112 01-Jul-2015 15:43 x64
Webclnt.dll 6.0.6002.23739 218,624 01-Jul-2015 15:24 x64
Webclnt.dll 6.0.6002.19433 199,680 01-Jul-2015 15:57 x86
Webclnt.dll 6.0.6002.23739 199,680 01-Jul-2015 15:31 x86

Windows 7 and Windows Server 2008 R2 file information

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version Product Milestone Service branch
    6.1.7601.18xxx Windows 7 and Windows Server 2008 R2 SP1 GDR
    6.1.7601.22xxx Windows 7 and Windows Server 2008 R2 SP1 LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x86-based versions of Windows 7

File name File version File size Date Time Platform
Davclnt.dll 6.1.7601.18912 82,432 01-Jul-2015 20:30 x86
Davclnt.dll 6.1.7601.23115 87,552 01-Jul-2015 17:52 x86
Webclnt.dll 6.1.7601.18912 206,848 01-Jul-2015 20:30 x86
Webclnt.dll 6.1.7601.23115 209,920 01-Jul-2015 17:52 x86

For all supported x64-based versions of Windows 7 and Windows Server 2008 R2

File name File version File size Date Time Platform
Davclnt.dll 6.1.7601.18912 102,912 01-Jul-2015 20:48 x64
Davclnt.dll 6.1.7601.23115 109,056 01-Jul-2015 18:20 x64
Webclnt.dll 6.1.7601.18912 260,096 01-Jul-2015 20:49 x64
Webclnt.dll 6.1.7601.23115 264,704 01-Jul-2015 18:21 x64
Davclnt.dll 6.1.7601.18912 82,432 01-Jul-2015 20:30 x86
Davclnt.dll 6.1.7601.23115 87,552 01-Jul-2015 17:52 x86
Webclnt.dll 6.1.7601.18912 206,848 01-Jul-2015 20:30 x86
Webclnt.dll 6.1.7601.23115 209,920 01-Jul-2015 17:52 x86

Windows 8 and Windows Server 2012 file information

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version Product Milestone Service branch
    6.2.920 0.16 xxx Windows 8 and Windows Server 2012 RTM GDR
    6.2.920 0.20 xxx Windows 8 and Windows Server 2012 RTM LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x86-based versions of Windows 8

File name File version File size Date Time Platform
Davclnt.dll 6.2.9200.17428 86,016 01-Jul-2015 11:41 x86
Davclnt.dll 6.2.9200.21538 86,016 01-Jul-2015 10:54 x86
Webclnt.dll 6.2.9200.17428 198,656 01-Jul-2015 11:42 x86
Webclnt.dll 6.2.9200.21538 199,168 01-Jul-2015 10:55 x86

For all supported x64-based versions of Windows 8 and Windows Server 2012

File name File version File size Date Time Platform
Davclnt.dll 6.2.9200.17428 104,448 01-Jul-2015 12:58 x64
Davclnt.dll 6.2.9200.21538 104,448 01-Jul-2015 11:39 x64
Webclnt.dll 6.2.9200.17428 227,328 01-Jul-2015 13:00 x64
Webclnt.dll 6.2.9200.21538 227,840 01-Jul-2015 11:41 x64
Davclnt.dll 6.2.9200.17428 86,016 01-Jul-2015 11:41 x86
Davclnt.dll 6.2.9200.21538 86,016 01-Jul-2015 10:54 x86
Davclnt.dll 6.2.9200.17428 86,016 01-Jul-2015 11:41 x86
Davclnt.dll 6.2.9200.21538 86,016 01-Jul-2015 10:54 x86
Webclnt.dll 6.2.9200.17428 198,656 01-Jul-2015 11:42 x86
Webclnt.dll 6.2.9200.21538 199,168 01-Jul-2015 10:55 x86

Windows 8.1 and Windows Server 2012 R2 file information

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version Product Milestone Service branch
    6.3.920 0.16 xxx Windows 8.1 and Windows Server 2012 R2 RTM GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

For all supported x86-based versions of Windows 8.1

File name File version File size Date Time Platform
Davclnt.dll 6.3.9600.17923 87,040 01-Jul-2015 21:35 x86
Webclnt.dll 6.3.9600.17923 198,656 01-Jul-2015 21:37 x86

For all supported x64-based versions of Windows 8.1 and Windows Server 2012 R2

File name File version File size Date Time Platform
Davclnt.dll 6.3.9600.17923 104,448 01-Jul-2015 22:16 x64
Webclnt.dll 6.3.9600.17923 228,864 01-Jul-2015 22:19 x64
Davclnt.dll 6.3.9600.17923 87,040 01-Jul-2015 21:35 x86
Davclnt.dll 6.3.9600.17923 87,040 01-Jul-2015 21:35 x86
Webclnt.dll 6.3.9600.17923 198,656 01-Jul-2015 21:37 x86

      

How to obtain help and support for this security update

Help for installing updates: Support for Microsoft Update

Security solutions for IT professionals: TechNet Security Troubleshooting and Support

Help for protecting your Windows-based computer from viruses and malware: Virus Solution and Security Center

Local support according to your country: International Support