Summary
This security update resolves vulnerabilities in Windows. These vulnerabilities could allow elevation of privilege if an attacker logs on to the system and runs a specially crafted application. To exploit the vulnerabilities, an attacker would first have to log on to the system. This security update addresses the vulnerabilities by correcting how Windows validates impersonation events. To learn more about the vulnerabilities, see Microsoft Security Bulletin MS15-038.
To resolve the vulnerabilities, you may need to apply multiple updates depending on the version of Windows you are running, see the following table for more information:
Windows version |
Updates to install |
---|---|
Windows Server 2003 R2 SP2 |
|
Windows Vista SP2, Windows Server 2008 SP2 |
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 will be 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.
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 the following table that corresponds to the version of Windows you are running.
Windows version |
Download link |
---|---|
Windows Server 2003 R2 Service Pack 2 |
|
Windows Vista SP2 |
|
Windows Server 2008 SP2 |
Download 32-bit (KB3045685)
|
Windows 7 SP1 |
|
Windows Server 2008 R2 SP1 |
Download 64-bit (KB3045685)
|
Windows 8 |
|
Windows Server 2012 |
|
Windows 8.1 |
|
Windows Server 2012 R2 |
More Information
Security update deployment informationFor deployment information about this update, see Microsoft Knowledge Base Article 3049576.
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 Server 2003 R2 file information
-
The files that apply to a specific milestone (SPn) and service branch (QFE, GDR) are noted in the "SP requirement" and "Service branch" columns.
-
GDR service branches contain only those fixes that are widely released to address widespread, critical issues. QFE service branches contain hotfixes in addition to widely released fixes.
-
In addition to the files that are listed in these tables, this software update also installs an associated security catalog file (KBnumber.cat) that is signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2003 R2
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
---|---|---|---|---|---|---|---|
Clfs.sys |
5.2.3790.5562 |
366,592 |
04-Mar-2015 |
01:11 |
x64 |
SP2 |
SP2QFE |
Clfsw32.dll |
5.2.3790.5562 |
105,984 |
04-Mar-2015 |
01:11 |
x64 |
SP2 |
SP2QFE |
Clfs.sys |
5.2.3790.5562 |
366,592 |
04-Mar-2015 |
01:11 |
x64 |
SP2 |
SP2QFE\IA |
Clfs.sys |
5.2.3790.5562 |
366,592 |
04-Mar-2015 |
01:11 |
x64 |
SP2 |
SP2QFE\ID |
Clfs.sys |
5.2.3790.5562 |
366,592 |
04-Mar-2015 |
01:11 |
x64 |
SP2 |
SP2QFE\IS |
For all supported x86-based versions of Windows Server 2003 R2
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
---|---|---|---|---|---|---|---|
Clfs.sys |
5.2.3790.5562 |
204,288 |
04-Mar-2015 |
00:54 |
x86 |
SP2 |
SP2QFE |
Clfs.sys |
5.2.3790.5562 |
204,288 |
04-Mar-2015 |
00:54 |
x86 |
SP2 |
SP2QFE\IA |
Clfsw32.dll |
5.2.3790.5562 |
79,360 |
04-Mar-2015 |
02:07 |
x86 |
SP2 |
SP2QFE\IA |
Clfs.sys |
5.2.3790.5562 |
204,288 |
04-Mar-2015 |
00:54 |
x86 |
SP2 |
SP2QFE\ID |
Clfsw32.dll |
5.2.3790.5562 |
79,360 |
04-Mar-2015 |
02:07 |
x86 |
SP2 |
SP2QFE\ID |
Clfs.sys |
5.2.3790.5562 |
204,288 |
04-Mar-2015 |
00:54 |
x86 |
SP2 |
SP2QFE\IS |
Clfsw32.dll |
5.2.3790.5562 |
79,360 |
04-Mar-2015 |
02:07 |
x86 |
SP2 |
SP2QFE\IS |
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 |
---|---|---|---|---|---|
Clfsw32.dll |
6.0.6002.19331 |
57,344 |
05-Mar-2015 |
02:23 |
x86 |
Clfsw32.dll |
6.0.6002.23639 |
57,344 |
05-Mar-2015 |
01:41 |
x86 |
Clfs.mof |
Not applicable |
3,472 |
18-Sep-2006 |
21:38 |
Not applicable |
Clfs.sys |
6.0.6002.19331 |
244,152 |
05-Mar-2015 |
02:32 |
x86 |
Clfsuninstall.mof |
Not applicable |
123 |
18-Sep-2006 |
21:39 |
Not applicable |
Clfs.mof |
Not applicable |
3,472 |
07-May-2014 |
23:47 |
Not applicable |
Clfs.sys |
6.0.6002.23639 |
244,152 |
05-Mar-2015 |
01:46 |
x86 |
Clfsuninstall.mof |
Not applicable |
123 |
07-May-2014 |
23:47 |
Not applicable |
For all supported x64-based versions of Windows Vista and Windows Server 2008
File name |
File version |
File size |
Date |
Time |
Platform |
---|---|---|---|---|---|
Clfsw32.dll |
6.0.6002.19331 |
77,824 |
05-Mar-2015 |
01:58 |
x64 |
Clfsw32.dll |
6.0.6002.23639 |
77,824 |
05-Mar-2015 |
01:35 |
x64 |
Clfs.mof |
Not applicable |
3,472 |
18-Sep-2006 |
21:36 |
Not applicable |
Clfs.sys |
6.0.6002.19331 |
360,384 |
05-Mar-2015 |
02:14 |
x64 |
Clfsuninstall.mof |
Not applicable |
123 |
18-Sep-2006 |
21:36 |
Not applicable |
Clfs.mof |
Not applicable |
3,472 |
07-May-2014 |
23:46 |
Not applicable |
Clfs.sys |
6.0.6002.23639 |
360,384 |
05-Mar-2015 |
01:51 |
x64 |
Clfsuninstall.mof |
Not applicable |
123 |
07-May-2014 |
23:46 |
Not applicable |
Clfsw32.dll |
6.0.6002.19331 |
57,344 |
05-Mar-2015 |
02:23 |
x86 |
Clfsw32.dll |
6.0.6002.23639 |
57,344 |
05-Mar-2015 |
01:41 |
x86 |
For all supported IA-64-based versions of Windows Server 2008
File name |
File version |
File size |
Date |
Time |
Platform |
---|---|---|---|---|---|
Clfsw32.dll |
6.0.6002.19331 |
182,272 |
05-Mar-2015 |
01:33 |
IA-64 |
Clfsw32.dll |
6.0.6002.23639 |
182,272 |
05-Mar-2015 |
01:12 |
IA-64 |
Clfs.mof |
Not applicable |
3,472 |
03-Jan-2008 |
18:57 |
Not applicable |
Clfs.sys |
6.0.6002.19331 |
843,192 |
05-Mar-2015 |
01:49 |
IA-64 |
Clfsuninstall.mof |
Not applicable |
123 |
03-Jan-2008 |
18:57 |
Not applicable |
Clfs.mof |
Not applicable |
3,472 |
07-May-2014 |
23:46 |
Not applicable |
Clfs.sys |
6.0.6002.23639 |
843,192 |
05-Mar-2015 |
01:22 |
IA-64 |
Clfsuninstall.mof |
Not applicable |
123 |
07-May-2014 |
23:46 |
Not applicable |
Clfsw32.dll |
6.0.6002.19331 |
57,344 |
05-Mar-2015 |
02:23 |
x86 |
Clfsw32.dll |
6.0.6002.23639 |
57,344 |
05-Mar-2015 |
01:41 |
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 |
---|---|---|---|---|---|
Clfsw32.dll |
6.1.7601.18777 |
58,880 |
04-Mar-2015 |
04:10 |
x86 |
Clfsw32.dll |
6.1.7601.22981 |
58,880 |
04-Mar-2015 |
04:15 |
x86 |
Clfs.sys |
6.1.7601.18777 |
249,784 |
04-Mar-2015 |
04:16 |
x86 |
Clfs.sys |
6.1.7601.22981 |
249,792 |
04-Mar-2015 |
04:19 |
x86 |
For all supported x64-based versions of Windows 7 and Windows Server 2008 R2
File name |
File version |
File size |
Date |
Time |
Platform |
---|---|---|---|---|---|
Clfsw32.dll |
6.1.7601.18777 |
79,360 |
04-Mar-2015 |
04:41 |
x64 |
Clfsw32.dll |
6.1.7601.22981 |
79,360 |
04-Mar-2015 |
04:33 |
x64 |
Clfs.sys |
6.1.7601.18777 |
367,552 |
04-Mar-2015 |
04:55 |
x64 |
Clfs.sys |
6.1.7601.22981 |
367,544 |
04-Mar-2015 |
04:37 |
x64 |
Clfsw32.dll |
6.1.7601.18777 |
58,880 |
04-Mar-2015 |
04:10 |
x86 |
Clfsw32.dll |
6.1.7601.22981 |
58,880 |
04-Mar-2015 |
04:15 |
x86 |
For all supported IA-64-based versions of Windows Server 2008 R2
File name |
File version |
File size |
Date |
Time |
Platform |
---|---|---|---|---|---|
Clfsw32.dll |
6.1.7601.18777 |
187,392 |
04-Mar-2015 |
03:38 |
IA-64 |
Clfsw32.dll |
6.1.7601.22981 |
187,392 |
04-Mar-2015 |
03:39 |
IA-64 |
Clfs.sys |
6.1.7601.18777 |
846,784 |
04-Mar-2015 |
03:42 |
IA-64 |
Clfs.sys |
6.1.7601.22981 |
846,776 |
04-Mar-2015 |
03:44 |
IA-64 |
Clfsw32.dll |
6.1.7601.18777 |
58,880 |
04-Mar-2015 |
04:10 |
x86 |
Clfsw32.dll |
6.1.7601.22981 |
58,880 |
04-Mar-2015 |
04:15 |
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 |
---|---|---|---|---|---|
Clfsw32.dll |
6.2.9200.17291 |
57,856 |
04-Mar-2015 |
04:52 |
x86 |
Clfsw32.dll |
6.2.9200.21408 |
57,856 |
04-Mar-2015 |
04:23 |
x86 |
Clfs.sys |
6.2.9200.17291 |
256,832 |
04-Mar-2015 |
05:22 |
x86 |
Clfs.sys |
6.2.9200.21408 |
256,832 |
04-Mar-2015 |
05:07 |
x86 |
For all supported x64-based versions of Windows 8 and Windows Server 2012
File name |
File version |
File size |
Date |
Time |
Platform |
---|---|---|---|---|---|
Clfsw32.dll |
6.2.9200.17291 |
74,752 |
04-Mar-2015 |
06:39 |
x64 |
Clfsw32.dll |
6.2.9200.21408 |
74,752 |
04-Mar-2015 |
05:20 |
x64 |
Clfs.sys |
6.2.9200.17291 |
361,280 |
04-Mar-2015 |
07:29 |
x64 |
Clfs.sys |
6.2.9200.21408 |
361,280 |
04-Mar-2015 |
07:07 |
x64 |
Clfsw32.dll |
6.2.9200.17291 |
57,856 |
04-Mar-2015 |
04:52 |
x86 |
Clfsw32.dll |
6.2.9200.21408 |
57,856 |
04-Mar-2015 |
04:23 |
x86 |
Windows 8.1 and Windows Server 2012 R2 file information
For all supported x86-based versions of Windows 8.1
File name |
File version |
File size |
Date |
Time |
Platform |
---|---|---|---|---|---|
Clfsw32.dll |
6.3.9600.17719 |
58,880 |
04-Mar-2015 |
02:19 |
x86 |
Clfs.sys |
6.3.9600.17719 |
279,360 |
04-Mar-2015 |
10:05 |
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 |
---|---|---|---|---|---|
Clfsw32.dll |
6.3.9600.17719 |
75,264 |
04-Mar-2015 |
03:04 |
x64 |
Clfs.sys |
6.3.9600.17719 |
377,152 |
04-Mar-2015 |
10:25 |
x64 |
Clfsw32.dll |
6.3.9600.17719 |
58,880 |
04-Mar-2015 |
02:19 |
x86 |
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