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

No

No

Mitigating Factors
Microsoft has not identified any mitigating factor for this vulnerability.

Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.

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 user’s 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

Mitigating Factors
Microsoft has identified the following mitigating factors for this vulnerability.
An enterprise perimeter firewall can be used to prevent this type of attack. See Knowledge Base Article 3285535 for guidance on configuring an enterprise perimeter firewall.

Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.

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

Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

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

Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

Leave a Reply