You are currently offline, waiting for your internet to reconnect

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

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 namesFor 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 switchesSee Microsoft Knowledge Base Article 934307
Restart requirementIn 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 informationWUSA.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 informationSee the file information section.
Registry key verificationNote 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 namesFor 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 switchesSee Microsoft Knowledge Base Article 934307
Restart requirementIn 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 informationWUSA.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 informationSee the file information section.
Registry key verificationNote 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 nameFor 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 switchesSee Microsoft Knowledge Base Article 934307
Restart requirementIn 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 informationTo 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 informationSee the file information section.
Registry key verificationNote 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 nameFor all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB3076949-x64.msu
Installation switchesSee Microsoft Knowledge Base Article 934307
Restart requirementIn 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 informationTo 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 informationSee the file information section.
Registry key verificationNote 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 nameFor 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 switchesSee Microsoft Knowledge Base Article 934307
Restart requirementIn 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 informationTo 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 informationSee the file information section.
Registry key verificationNote 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 nameFor 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 switchesSee Microsoft Knowledge Base Article 934307
Restart requirementIn 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 informationTo 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 informationSee the file information section.
Registry key verificationNote 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.
DeploymentThese updates are available through Windows Update only.
Restart requirementIn 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 informationClick 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 informationSee the file information section.

File hash information

File nameSHA1 hashSHA256 hash
Windows6.1-KB3076949-x86.msu534060F9BDDB4DBA2C47CD36B9F277369ECD8BEB9D21818913DBFD1E56C6CBAAEC19F6F67458EE0DE9EE61220E29FC446A66AC78
Windows8.1-KB3076949-arm.msuBD921E99258E1001ECC3CD023E7651CE43B8EAE89357135F6BAEA8A15D53A0A065E42B0E1DE462C917446793A544219190FD4E91
Windows8-RT-KB3076949-arm.msuD944FAA57AB33A8DA53219CD2DBA411D714A24FAF04864D34A5161F35E81E5208600C3420EE26EA574C3BCBE9106E21D36F0BFD1
Windows6.1-KB3076949-x86.msu534060F9BDDB4DBA2C47CD36B9F277369ECD8BEB9D21818913DBFD1E56C6CBAAEC19F6F67458EE0DE9EE61220E29FC446A66AC78
Windows6.1-KB3076949-x64.msu13CB56A9879CA98D6644E8357B3FC52C9ACFB7853359638FE3CF59FF4332B2490339050EAEA2368EA1F64AB21838C6E60DB4165D
Windows8-RT-KB3076949-x86.msu3E0BA36FDCB0911C66C557C7C1A55877490525DF0C31DAE892AA39FEF310961CF74C8886AB68E601BD842914C487E7A851C5679F
Windows8-RT-KB3076949-x64.msu8DADDA02FA80E8F642C9BE33DF88157428AEEC96A188E2BC097756C475BD73A5EFE2A918483BFB4B7865CCE293DFCBAD94EB21D2
Windows8.1-KB3076949-x86.msuBAF4582CF62D5627116FB7193A567FB5445CDB0005A201ABEFC62D07110DCC015FAEBF6B0F329CD2C5334E25A80A147661C5AF27
Windows8.1-KB3076949-x64.msuB9FAE4CFC9E1B64B612BF9844119ED40747A2DB647F67969EC66F81AA6BB305174E63F6283A3CB033AD5A041CFFD40319EB95D0B
Windows8-RT-KB3076949-arm.msuD944FAA57AB33A8DA53219CD2DBA411D714A24FAF04864D34A5161F35E81E5208600C3420EE26EA574C3BCBE9106E21D36F0BFD1
Windows8.1-KB3076949-arm.msuBD921E99258E1001ECC3CD023E7651CE43B8EAE89357135F6BAEA8A15D53A0A065E42B0E1DE462C917446793A544219190FD4E91
Windows6.0-KB3076949-x86.msuBA127E74BA7EDD3863CDE512B855706C807EDB2C2F2353437CF36625C051DAF991ED9DB7272C1A225F1789B6E643FD4B457B7C07
Windows6.0-KB3076949-x86.msuBA127E74BA7EDD3863CDE512B855706C807EDB2C2F2353437CF36625C051DAF991ED9DB7272C1A225F1789B6E643FD4B457B7C07
Windows6.0-KB3076949-x64.msu70EB7E27870702D8629BD3DF15B353F277398B83F3930CB112A0783F7AEC3C9458C534F38A80C8398742C475FFBF7C0857C0C7E3
Windows6.0-KB3076949-x64.msu70EB7E27870702D8629BD3DF15B353F277398B83F3930CB112A0783F7AEC3C9458C534F38A80C8398742C475FFBF7C0857C0C7E3
Windows6.1-KB3076949-x64.msu13CB56A9879CA98D6644E8357B3FC52C9ACFB7853359638FE3CF59FF4332B2490339050EAEA2368EA1F64AB21838C6E60DB4165D
Windows6.1-KB3076949-x64.msu13CB56A9879CA98D6644E8357B3FC52C9ACFB7853359638FE3CF59FF4332B2490339050EAEA2368EA1F64AB21838C6E60DB4165D
Windows8-RT-KB3076949-x64.msu8DADDA02FA80E8F642C9BE33DF88157428AEEC96A188E2BC097756C475BD73A5EFE2A918483BFB4B7865CCE293DFCBAD94EB21D2
Windows8-RT-KB3076949-x86.msu3E0BA36FDCB0911C66C557C7C1A55877490525DF0C31DAE892AA39FEF310961CF74C8886AB68E601BD842914C487E7A851C5679F
Windows8-RT-KB3076949-x64.msu8DADDA02FA80E8F642C9BE33DF88157428AEEC96A188E2BC097756C475BD73A5EFE2A918483BFB4B7865CCE293DFCBAD94EB21D2
Windows8-RT-KB3076949-x86.msu3E0BA36FDCB0911C66C557C7C1A55877490525DF0C31DAE892AA39FEF310961CF74C8886AB68E601BD842914C487E7A851C5679F
Windows8.1-KB3076949-x64.msuB9FAE4CFC9E1B64B612BF9844119ED40747A2DB647F67969EC66F81AA6BB305174E63F6283A3CB033AD5A041CFFD40319EB95D0B
Windows8.1-KB3076949-x86.msuBAF4582CF62D5627116FB7193A567FB5445CDB0005A201ABEFC62D07110DCC015FAEBF6B0F329CD2C5334E25A80A147661C5AF27
Windows8.1-KB3076949-x86.msuBAF4582CF62D5627116FB7193A567FB5445CDB0005A201ABEFC62D07110DCC015FAEBF6B0F329CD2C5334E25A80A147661C5AF27
Windows8.1-KB3076949-x64.msuB9FAE4CFC9E1B64B612BF9844119ED40747A2DB647F67969EC66F81AA6BB305174E63F6283A3CB033AD5A041CFFD40319EB95D0B
Windows6.0-KB3076949-x86.msuBA127E74BA7EDD3863CDE512B855706C807EDB2C2F2353437CF36625C051DAF991ED9DB7272C1A225F1789B6E643FD4B457B7C07
Windows6.0-KB3076949-x64.msu70EB7E27870702D8629BD3DF15B353F277398B83F3930CB112A0783F7AEC3C9458C534F38A80C8398742C475FFBF7C0857C0C7E3

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:
    VersionProductMilestoneService branch
    6.0.6002.18xxxWindows Vista SP2 and Windows Server 2008 SP2SP2GDR
    6.0.6002.23xxxWindows Vista SP2 and Windows Server 2008 SP2SP2LDR
  • 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 nameFile versionFile sizeDateTimePlatform
Webclnt.dll6.0.6002.19433199,68001-Jul-201515:57x86
Webclnt.dll6.0.6002.23739199,68001-Jul-201515:31x86

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

File nameFile versionFile sizeDateTimePlatform
Webclnt.dll6.0.6002.19433218,11201-Jul-201515:43x64
Webclnt.dll6.0.6002.23739218,62401-Jul-201515:24x64
Webclnt.dll6.0.6002.19433199,68001-Jul-201515:57x86
Webclnt.dll6.0.6002.23739199,68001-Jul-201515:31x86

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:
    VersionProductMilestoneService branch
    6.1.7601.18xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.7601.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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 nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.1.7601.1891282,43201-Jul-201520:30x86
Davclnt.dll6.1.7601.2311587,55201-Jul-201517:52x86
Webclnt.dll6.1.7601.18912206,84801-Jul-201520:30x86
Webclnt.dll6.1.7601.23115209,92001-Jul-201517:52x86

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

File nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.1.7601.18912102,91201-Jul-201520:48x64
Davclnt.dll6.1.7601.23115109,05601-Jul-201518:20x64
Webclnt.dll6.1.7601.18912260,09601-Jul-201520:49x64
Webclnt.dll6.1.7601.23115264,70401-Jul-201518:21x64
Davclnt.dll6.1.7601.1891282,43201-Jul-201520:30x86
Davclnt.dll6.1.7601.2311587,55201-Jul-201517:52x86
Webclnt.dll6.1.7601.18912206,84801-Jul-201520:30x86
Webclnt.dll6.1.7601.23115209,92001-Jul-201517:52x86

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:
    VersionProductMilestoneService branch
    6.2.920 0.16 xxxWindows 8 and Windows Server 2012RTMGDR
    6.2.920 0.20 xxxWindows 8 and Windows Server 2012RTMLDR
  • 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 nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.2.9200.1742886,01601-Jul-201511:41x86
Davclnt.dll6.2.9200.2153886,01601-Jul-201510:54x86
Webclnt.dll6.2.9200.17428198,65601-Jul-201511:42x86
Webclnt.dll6.2.9200.21538199,16801-Jul-201510:55x86

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

File nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.2.9200.17428104,44801-Jul-201512:58x64
Davclnt.dll6.2.9200.21538104,44801-Jul-201511:39x64
Webclnt.dll6.2.9200.17428227,32801-Jul-201513:00x64
Webclnt.dll6.2.9200.21538227,84001-Jul-201511:41x64
Davclnt.dll6.2.9200.1742886,01601-Jul-201511:41x86
Davclnt.dll6.2.9200.2153886,01601-Jul-201510:54x86
Davclnt.dll6.2.9200.1742886,01601-Jul-201511:41x86
Davclnt.dll6.2.9200.2153886,01601-Jul-201510:54x86
Webclnt.dll6.2.9200.17428198,65601-Jul-201511:42x86
Webclnt.dll6.2.9200.21538199,16801-Jul-201510:55x86

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:
    VersionProductMilestoneService branch
    6.3.920 0.16 xxxWindows 8.1 and Windows Server 2012 R2RTMGDR
  • 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 nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.3.9600.1792387,04001-Jul-201521:35x86
Webclnt.dll6.3.9600.17923198,65601-Jul-201521:37x86

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

File nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.3.9600.17923104,44801-Jul-201522:16x64
Webclnt.dll6.3.9600.17923228,86401-Jul-201522:19x64
Davclnt.dll6.3.9600.1792387,04001-Jul-201521:35x86
Davclnt.dll6.3.9600.1792387,04001-Jul-201521:35x86
Webclnt.dll6.3.9600.17923198,65601-Jul-201521:37x86

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
malicious attacker exploit
Properties

Article ID: 3076949 - Last Review: 08/11/2015 17:14:00 - Revision: 1.0

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 Standard, Windows Server 2012 Essentials, Windows Server 2012 Foundation, Windows 8 Enterprise, Windows 8 Pro, Windows 8, Windows RT, Windows Server 2008 R2 Service Pack 1, Windows 7 Service Pack 1, Windows Server 2008 Service Pack 2, Windows Vista Service Pack 2

  • atdownload kbbug kbexpertiseinter kbfix kbsecbulletin kbsecurity kbsecvulnerability KB3076949
Feedback
ody>dy>