Summary
This security update resolves vulnerabilities in Microsoft Windows. The vulnerabilities could allow elevation of privilege if the Web Proxy Auto Discovery (WPAD) protocol falls back to a vulnerable proxy discovery process on a target system.
To learn more about the vulnerability, see Microsoft Security Bulletin MS16-077.
More Information
Important
-
All future security and non-security 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.
Behavior changes after installation
After you install this security update, the following changes are applied:
-
NETBIOS communication outside of the local subnet is hardened. Therefore, by default, some features that depend on NETBIOS (such as SMB over NETBIOS) will not work outside the local subnet. To change this new default behavior, create the following registry entry:
SUBKEY: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Parameters
Value Name: AllowNBToInternet
Type: Dword
Value: 1
Default value of the flag: 0 -
By default, WPAD resolution for auto proxy detection will not use NETBIOS. Therefore, if proxy detection depends on NETBIOS alone for WPAD resolution, it may fail. We recommend that you use the DHCP option or DNS for WPAD resolution instead of NETBIOS. To change this new default behavior, create the following registry entry.
Note This registry entry only applies for Windows 8.1 and earlier versions of Windows.SUBKEY: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp
Value Name: AllowOnlyDNSQueryForWPAD
Type: DWORD
Value: 0
Default value of the flag: 1 -
The default behavior of PAC file download is changed so that the client's domain credentials are not automatically sent in response to an NTLM or Negotiate Authentication challenge when WinHTTP requests the PAC file. This occurs regardless of the value of the fAutoLogonIfChallenged flag that is specified in WINHTTP_AUTOPROXY_OPTIONS. To change this new default behavior, create the following registry entry:
Note This registry entry only applies for Windows 8.1 and earlier versions of Windows.SUBKEY: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp
Value Name: AutoProxyAutoLogonIfChallenged
Type: DWORD
Value: 1
Default value of the flag: 0
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 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 MS16-077 that corresponds to the version of Windows that you are running.
More Information
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
File Information
|
File name |
SHA1 hash |
SHA256 hash |
|---|---|---|
|
Windows8.1-KB3161949-x86.msu |
A15B1E6C4E2D8C061C13AD6697340030D11300F9 |
684F04EC92FDB71A0587910F5223F29B1B1126E69B049EA4E6C1AB3E32BCD103 |
|
Windows8.1-KB3161949-x64.msu |
303F894A71FAD84F147E1EE715F8C60DDFC752D7 |
39F78CC8472AA4ACB6AF6BD18CC13BDEFB9728ED71FCEE2001E063683FED2B50 |
|
Windows8-RT-KB3161949-x64.msu |
FD0D730F70653946886E358E9896364816937500 |
86967AF0963599C4E49835B35EF3A8A6BFA39FCBCB3C6DA378D02E70F34A023C |
|
Windows6.0-KB3161949-x64.msu |
E60F107F4F893C19885931B3C6121FDDF1150E52 |
D2F0E848E7D45C428324DD6833CE1F6B9E36F4EC0C27FA33993B482C20A870E0 |
|
Windows6.0-KB3161949-x86.msu |
45C230D3302716D81E413BD233F953BD6F6F1F09 |
B45C8FB5F7E96CE551E752F67E45AAB6657B9E204C603F23AA7284BB39FA3E8D |
|
Windows6.1-KB3161949-x86.msu |
0055D0D1E103D374E042F31EBDD26931853B882B |
F968AB471633DB7EBAF2619902CBB6246D14B14AF6E29CCA6C2981EB898DE0B7 |
|
Windows6.1-KB3161949-ia64.msu |
9136B0FC403D6CDCD8CF94B061953CC11723CADB |
7A2FFB83D4CE22325768FF94C71A9FFE839C653D1B8EA2C3BA73DDF89B2555C8 |
|
Windows6.1-KB3161949-x64.msu |
E2372FB5746E9474CEC6EF1710F8D58EC5C6C000 |
7CFC5DCDDD7A72E1CB143E41A98D5EAF23CE554104F05311EFD8B317BCE8E847 |
|
Windows6.0-KB3161949-ia64.msu |
2F913DA164CBAD6FD4331A9D06BA3F457EC6887F |
540668B9660A8CD03240B7DCF84A9DFAEBCCBE3C4661340389FB0A049F317825 |
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). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.
Windows 8.1 and Windows Server 2012 R2 file information
Notes
-
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
6.3.960 0.16 xxx
Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
RTM
GDR
6.3.960 0.17 xxx
Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
RTM
GDR
6.3.960 0.18 xxx
Windows RT 8.1, 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.
-
The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x86-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.3.9600.18340 |
213,504 |
13-May-2016 |
22:22 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.3.9600.18340 |
286,208 |
13-May-2016 |
21:35 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.3.9600.18340 |
320,720 |
14-May-2016 |
20:01 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.3.9600.18340 |
631,808 |
13-May-2016 |
21:26 |
x86 |
None |
Not applicable |
For all supported x64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.3.9600.18340 |
281,088 |
13-May-2016 |
23:07 |
x64 |
None |
Not applicable |
|
Mswsock.dll |
6.3.9600.18340 |
339,456 |
13-May-2016 |
21:58 |
x64 |
SP_ |
AMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.3.9600.18340 |
363,104 |
14-May-2016 |
20:01 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.3.9600.18340 |
802,816 |
13-May-2016 |
21:45 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.3.9600.18340 |
631,808 |
13-May-2016 |
21:26 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.3.9600.18340 |
286,208 |
13-May-2016 |
21:35 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.3.9600.18340 |
320,720 |
14-May-2016 |
20:01 |
x86 |
None |
Not applicable |
Windows Server 2012 file information
Notes
-
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 0.17xxx
Windows 8, Windows RT, or Windows Server 2012
RTM
GDR
6.2.920 0.21xxx
Windows 8, Windows RT, or 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.
-
The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.2.9200.21859 |
318,976 |
09-May-2016 |
13:19 |
x64 |
None |
Not applicable |
|
Mswsock.dll |
6.2.9200.21858 |
355,328 |
09-May-2016 |
15:41 |
x64 |
SP_ |
AMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.2.9200.21858 |
343,552 |
09-May-2016 |
15:41 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.2.9200.21858 |
711,680 |
09-May-2016 |
15:41 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.2.9200.21797 |
516,096 |
08-Mar-2016 |
16:04 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.2.9200.21858 |
288,768 |
09-May-2016 |
16:38 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.2.9200.21858 |
307,712 |
09-May-2016 |
16:39 |
x86 |
None |
Not applicable |
Windows Vista and Windows Server 2008 file information
Notes
-
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
6.0.600 2.19xxx
Windows Vista or Windows Server 2008
SP2
GDR
6.0.600 2.23xxx
Windows Vista or Windows Server 2008
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.
-
The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.0.6002.19655 |
248,320 |
10-May-2016 |
14:55 |
x64 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.19655 |
24,064 |
10-May-2016 |
14:55 |
x64 |
None |
Not applicable |
|
Netbt.sys |
6.0.6002.23970 |
248,320 |
10-May-2016 |
14:53 |
x64 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.23970 |
24,064 |
10-May-2016 |
14:53 |
x64 |
None |
Not applicable |
|
Mswsock.dll |
6.0.6002.19655 |
304,128 |
10-May-2016 |
15:54 |
x64 |
SP_ |
AMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Mswsock.dll |
6.0.6002.23970 |
303,616 |
10-May-2016 |
15:34 |
x64 |
SP_ |
AMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.0.6002.19655 |
264,704 |
10-May-2016 |
15:55 |
x64 |
None |
Not applicable |
|
Ws2_32.dll |
6.0.6002.23970 |
264,704 |
10-May-2016 |
15:35 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.19655 |
442,880 |
10-May-2016 |
15:54 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.23970 |
442,880 |
10-May-2016 |
15:35 |
x64 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.19655 |
21,504 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.23970 |
21,504 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.19655 |
377,344 |
10-May-2016 |
15:31 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.23970 |
377,344 |
10-May-2016 |
15:14 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.0.6002.19655 |
223,232 |
10-May-2016 |
15:31 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Mswsock.dll |
6.0.6002.23970 |
223,232 |
10-May-2016 |
15:14 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.0.6002.19655 |
179,200 |
10-May-2016 |
15:31 |
x86 |
None |
Not applicable |
|
Ws2_32.dll |
6.0.6002.23970 |
179,200 |
10-May-2016 |
15:14 |
x86 |
None |
Not applicable |
For all supported x86-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.0.6002.19655 |
185,856 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.19655 |
21,504 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Netbt.sys |
6.0.6002.23970 |
186,368 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.23970 |
21,504 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.0.6002.19655 |
223,232 |
10-May-2016 |
15:31 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Mswsock.dll |
6.0.6002.23970 |
223,232 |
10-May-2016 |
15:14 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.0.6002.19655 |
179,200 |
10-May-2016 |
15:31 |
x86 |
None |
Not applicable |
|
Ws2_32.dll |
6.0.6002.23970 |
179,200 |
10-May-2016 |
15:14 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.19655 |
377,344 |
10-May-2016 |
15:31 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.23970 |
377,344 |
10-May-2016 |
15:14 |
x86 |
None |
Not applicable |
For all supported ia64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.0.6002.19655 |
632,832 |
10-May-2016 |
14:37 |
IA-64 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.19655 |
52,224 |
10-May-2016 |
14:36 |
IA-64 |
None |
Not applicable |
|
Netbt.sys |
6.0.6002.23970 |
632,832 |
10-May-2016 |
14:38 |
IA-64 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.23970 |
52,224 |
10-May-2016 |
14:37 |
IA-64 |
None |
Not applicable |
|
Mswsock.dll |
6.0.6002.19655 |
709,632 |
10-May-2016 |
15:23 |
IA-64 |
SP_ |
IA64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Mswsock.dll |
6.0.6002.23970 |
709,120 |
10-May-2016 |
15:12 |
IA-64 |
SP_ |
IA64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.0.6002.19655 |
519,168 |
10-May-2016 |
15:23 |
IA-64 |
None |
Not applicable |
|
Ws2_32.dll |
6.0.6002.23970 |
519,168 |
10-May-2016 |
15:13 |
IA-64 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.19655 |
962,048 |
10-May-2016 |
15:23 |
IA-64 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.23970 |
962,048 |
10-May-2016 |
15:13 |
IA-64 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.19655 |
21,504 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Netbtugc.exe |
6.0.6002.23970 |
21,504 |
10-May-2016 |
14:28 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.19655 |
377,344 |
10-May-2016 |
15:31 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.0.6002.23970 |
377,344 |
10-May-2016 |
15:14 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.0.6002.19655 |
223,232 |
10-May-2016 |
15:31 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Mswsock.dll |
6.0.6002.23970 |
223,232 |
10-May-2016 |
15:14 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.0.6002.19655 |
179,200 |
10-May-2016 |
15:31 |
x86 |
None |
Not applicable |
|
Ws2_32.dll |
6.0.6002.23970 |
179,200 |
10-May-2016 |
15:14 |
x86 |
None |
Not applicable |
Windows 7 and Windows Server 2008 R2 file information
Notes
-
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
6.1.760 1.18xxx
Windows 7 or Windows Server 2008 R2
SP1
GDR
6.1.760 1.23 xxx
Windows 7 or 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.
-
The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x86-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.1.7601.23451 |
188,928 |
11-May-2016 |
14:52 |
x86 |
None |
Not applicable |
|
Netbtugc.exe |
6.1.7601.23451 |
26,624 |
11-May-2016 |
15:01 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.1.7601.23451 |
231,424 |
11-May-2016 |
15:19 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.1.7601.23451 |
206,336 |
11-May-2016 |
15:19 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.1.7601.23451 |
351,744 |
11-May-2016 |
15:19 |
x86 |
None |
Not applicable |
For all supported ia64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.1.7601.23451 |
616,960 |
11-May-2016 |
14:44 |
IA-64 |
None |
Not applicable |
|
Netbtugc.exe |
6.1.7601.23451 |
53,760 |
11-May-2016 |
14:58 |
IA-64 |
None |
Not applicable |
|
Mswsock.dll |
6.1.7601.23451 |
750,592 |
11-May-2016 |
15:13 |
IA-64 |
SP_ |
IA64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.1.7601.23451 |
546,304 |
11-May-2016 |
15:13 |
IA-64 |
None |
Not applicable |
|
Winhttp.dll |
6.1.7601.23451 |
812,032 |
11-May-2016 |
15:13 |
IA-64 |
None |
Not applicable |
|
Netbtugc.exe |
6.1.7601.23451 |
26,624 |
11-May-2016 |
15:01 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.1.7601.23451 |
351,744 |
11-May-2016 |
15:19 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.1.7601.23451 |
231,424 |
11-May-2016 |
15:19 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.1.7601.23451 |
206,336 |
11-May-2016 |
15:19 |
x86 |
None |
Not applicable |
For all supported x64-based versions
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|---|---|---|---|---|---|---|---|
|
Netbt.sys |
6.1.7601.23451 |
262,144 |
11-May-2016 |
14:58 |
x64 |
None |
Not applicable |
|
Netbtugc.exe |
6.1.7601.23451 |
25,088 |
11-May-2016 |
15:11 |
x64 |
None |
Not applicable |
|
Mswsock.dll |
6.1.7601.23451 |
327,168 |
11-May-2016 |
17:02 |
x64 |
SP_ |
AMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.1.7601.23451 |
296,448 |
11-May-2016 |
17:02 |
x64 |
None |
Not applicable |
|
Winhttp.dll |
6.1.7601.23451 |
444,928 |
11-May-2016 |
17:02 |
x64 |
None |
Not applicable |
|
Netbtugc.exe |
6.1.7601.23451 |
26,624 |
11-May-2016 |
15:01 |
x86 |
None |
Not applicable |
|
Winhttp.dll |
6.1.7601.23451 |
351,744 |
11-May-2016 |
15:19 |
x86 |
None |
Not applicable |
|
Mswsock.dll |
6.1.7601.23451 |
231,424 |
11-May-2016 |
15:19 |
x86 |
SP_ |
X86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP |
|
Ws2_32.dll |
6.1.7601.23451 |
206,336 |
11-May-2016 |
15:19 |
x86 |
None |
Not applicable |
