Microsoft Security Bulletin MS15-006 - Important

Vulnerability in Windows Error Reporting Could Allow Security Feature Bypass (3004365)

Published: January 13, 2015 | Updated: July 22, 2015

Version: 2.0

This security update resolves a privately reported vulnerability in Windows Error Reporting (WER). The vulnerability could allow security feature bypass if successfully exploited by an attacker. An attacker who successfully exploited this vulnerability could gain access to the memory of a running process. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

This security update is rated important for all supported editions of Windows 8, Windows Server 2012, Windows RT, Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1. For more information, see the Affected Software section.

The security update addresses the vulnerability by correcting how WER interacts with processes. For more information about the vulnerability, see the Vulnerability Information section for the specific vulnerability.

For more information about this update, see Microsoft Knowledge Base Article 3004365

The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle

Affected Software 

Operating System

Maximum Security Impact

Aggregate Severity Rating

Updates Replaced

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows 8 for x64-based Systems
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows 8.1 for 32-bit Systems
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows 8.1 for x64-based Systems
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows Server 2012 R2
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows RT and Windows RT 8.1

Windows RT[1]
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Windows RT 8.1[1]
(3004365)

Security Feature Bypass

Important

3005607 in MS14-071

Server Core installation option

Windows Server 2012 (Server Core installation)
(3004365)

Security Feature Bypass

Important

None

Windows Server 2012 R2 (Server Core installation)
(3004365)

Security Feature Bypass

Important

None

[1]This update is available via Windows Update only. 

Does this update contain any security-related changes to functionality? 
Yes. In addition to the changes that are listed in the Vulnerability Information section of this bulletin, this update includes defense-in-depth updates to WER.

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the January bulletin summary

Vulnerability Severity Rating and Maximum Security Impact by Affected Software

Affected Software

Windows Error Reporting Security Feature Bypass Vulnerability - CVE-2015-0001

Aggregate Severity Rating

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems

Important 
Security Feature Bypass

Important

Windows 8 for x64-based Systems

Important 
Security Feature Bypass

Important

Windows 8.1 for 32-bit Systems

Important 
Security Feature Bypass

Important

Windows 8.1 for x64-based Systems

Important 
Security Feature Bypass

Important

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012

Important 
Security Feature Bypass

Important

Windows Server 2012 R2

Important 
Security Feature Bypass

Important

Windows RT and Windows RT 8.1

Windows RT

Important 
Security Feature Bypass

Important

Windows RT 8.1

Important 
Security Feature Bypass

Important

Server Core installation option

Windows Server 2012 (Server Core installation)

Important 
Security Feature Bypass

Important

Windows Server 2012 R2 (Server Core installation)

Important 
Security Feature Bypass

Important

Windows Error Reporting Security Feature Bypass Vulnerability - CVE-2015-0001

A security feature bypass vulnerability exists in Windows Error Reporting (WER) that allows administrative users to view the memory contents of processes protected by "Protected Process Light." "Protected Process Light" inhibits debugging of critical system processes by arbitrary users on the system, even administrative users. An attacker who successfully exploited this vulnerability could access the memory of a running process protected by "Protected Process Light."

"Protected Process Light" is designed to help mitigate attack scenarios where a malicious user already has administrative access and is trying to gather additional credentials in order to facilitate lateral attacks against other systems.

An attacker must have valid logon credentials, and be able to log on locally with administrator privileges to exploit this vulnerability. The update addresses the vulnerability by correcting how WER interacts with processes.

Microsoft received information about this vulnerability through coordinated vulnerability disclosure. When this security bulletin was issued, Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers.

Mitigating Factors

The following mitigating factors may be helpful in your situation:

  • An attacker must have valid logon credentials, and be able to log on locally with administrator privileges to successfully exploit this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability. 

For Security Update Deployment information see the Microsoft Knowledge Base article referenced here in the Executive Summary.

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information.

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

  • V1.0 (January 13, 2015): Bulletin published.
  • V1.1 (January 21, 2015): Bulletin revised to correct Server Core installation entries in the Affected Software and Severity Ratings tables. This is an informational change only. Customers who have already successfully installed the update do not have to take any action.
  • V2.0 (July 22, 2015): Bulletin revised to inform customers of the July 14, 2015 reoffering of the 3004365 update for Windows 8.1 and Windows Server 2012 R2 systems. The update provides defense-in-depth measures beyond what was provided in the original update issued on January 13, 2015. Customers running these operating systems who have already successfully applied the update should reinstall the update to be best protected from the vulnerability discussed in this bulletin.

Page generated 2015-07-22 10:09Z-07:00.
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