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AUSCERT External Security Bulletin Redistribution
ESB-2016.2144
Microsoft Security Bulletin MS16-110: Security Update for
Microsoft Windows (3178467)
14 September 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Administrator Compromise -- Existing Account
Denial of Service -- Unknown/Unspecified
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3369 CVE-2016-3368 CVE-2016-3352
CVE-2016-3346
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-110
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Microsoft Security Bulletin MS16-110: Security Update for Microsoft Windows
(3178467)
Executive Summary
This security update resolves vulnerabilities in Microsoft Windows. The most
severe of the vulnerabilities could allow remote code execution if an attacker
creates a specially crafted request and executes arbitrary code with elevated
permissions on a target system.
This security update is rated Important for all supported releases of
Microsoft Windows excluding Itanium servers, which are not affected.
Affected Software
Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1
Windows 10
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core
installation)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core
installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
installation)
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
Vulnerability Information
Windows Permissions Enforcement Elevation of Privilege Vulnerability -
CVE-2016-3346
An elevation of privilege vulnerability exists in the way that Windows
enforces permissions if an attacker loads a specially crafted DLL. A
locally-authenticated attacker who successfully exploited this vulnerability
could run arbitrary code as a system administrator. An attacker could then
install programs; view, change, or delete data; or create new accounts with
full user rights.
To exploit the vulnerability, an attacker would need to create and implement a
malicious DLL and already be able to execute code on the target system.
The security update addresses the vulnerability by correcting how Windows
enforces permissions.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Windows Permissions Enforcement Elevation of Privilege Vulnerability CVE-2016-3346 Yes No
Microsoft Information Disclosure Vulnerability - CVE-2016-3352
An information disclosure vulnerability exists when Windows fails to properly
validate NT LAN Manager (NTLM) Single Sign-On (SSO) requests during Microsoft
Account (MSA) login sessions. An attacker who successfully exploited the
vulnerability could attempt to brute force a users NTLM password hash.
To exploit the vulnerability, an attacker would have to trick a user into
browsing to a malicious website, or to an SMB or UNC path destination, or
convince a user to load a malicious document that initiates an NTLM SSO
validation request without the consent of the user.
To validate MSA NTLM SSO authentication requests properly, it is imperative
that Windows client operating system firewall profiles and enterprise
perimeter firewalls are configured correctly. If users are connected to the
Guest or public networks firewall profile it would imply that no enterprise
perimeter firewall is present between the user and the Internet.
The security update addresses the vulnerability by preventing NTLM SSO
authentication to non-private SMB resources when users are signed in to
Windows via a Microsoft Account network firewall profile for users who are
signed in to Windows via a Microsoft account
(https://www.microsoft.com/account) and connected to a Guest or public
networks firewall profile.
VPNs are considered private networks. For more information, see the Mitigating
Factors section.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Information Disclosure Vulnerability CVE-2016-3352 Yes No
Windows Remote Code Execution Vulnerability - CVE-2016-3368
A remote code execution vulnerability exists in the way that Windows handles
objects in memory. An attacker who successfully exploited the vulnerability
could execute arbitrary code with elevated permissions on a target system. To
exploit the vulnerability, an attacker who has a domain user account could
create a specially crafted request, causing Windows to execute arbitrary code
with elevated permissions. The security update addresses the vulnerability by
correcting how Windows handles objects in memory.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Windows Remote Code Execution Vulnerability CVE-2016-3368 No No
Windows Denial of Service Vulnerability - CVE-2016-3369
A denial of service vulnerability exists in the way that Windows handles
objects in memory. An attacker who successfully exploited the vulnerability
could cause a target system to stop responding. Note that the denial of
service condition would not allow an attacker to execute code or to elevate
user privileges. However, the denial of service condition could prevent
authorized users from using system resources. The security update addresses
the vulnerability by correcting how Windows handles objects in memory.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Windows Denial of Service Vulnerability CVE-2016-3369 No No
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