Microsoft Security Bulletin MS17-019 - Important

Security Update for Active Directory Federation Services (4010320)

Published: March 14, 2017

Version: 1.0

Executive Summary

This security update resolves a vulnerability in Active Directory Federation Services (ADFS). The vulnerability could allow information disclosure if an attacker sends a specially crafted request to an ADFS server, allowing the attacker to read sensitive information about the target system.

This security update is rated Important for all supported releases of Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, and Windows Server 2016. For more information, see the Affected Software and Vulnerability Severity Ratings section.

The update addresses the vulnerability by adding additional verification checks in ADFS. For more information about the vulnerability, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 4010320.

Affected Software and Vulnerability Severity Ratings

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.

The severity ratings indicated for each affected software 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 March bulletin summary.

<table style=“border:1px solid black;”> Operating System Microsoft Active Directory Federation Services Information Disclosure Vulnerability – CVE-2017-0043 Updates Replaced Windows Server 2008 Windows Server 2008 for 32-bit Systems Service Pack 2
(3217882) Important
Information Disclosure None Windows Server 2008 for x64-based Systems Service Pack 2
(3217882) Important
Information Disclosure None Windows Server 2008 R2 Windows Server 2008 R2 for x64-based Systems Service Pack 1
(4012212)
Security Only[1] Important
Information Disclosure None Windows Server 2008 R2 for x64-based Systems Service Pack 1
(4012215)
Monthly Rollup[1] Important
Information Disclosure 3212646 Windows Server 2012 and Windows Server 2012 R2 Windows Server 2012
(4012214)
Security Only[1] Important
Information Disclosure None Windows Server 2012
(4012217)
Monthly Rollup[1] Important
Information Disclosure 3205409 Windows Server 2012 R2
(4012213)
Security Only[1] Important
Information Disclosure None Windows Server 2012 R2
(4012216)
Monthly Rollup[1] Important
Information Disclosure 3205401 Windows Server 2016 Windows Server 2016 for x64-based Systems[3] (4013429) Important
Information Disclosure 3213986 Server Core installation option Windows Server 2012< (4012214)
Security Only[1]
Important
Information Disclosure None Windows Server 2012< (4012217)
Monthly Rollup[1]
Important
Information Disclosure 3205409 Windows Server 2012 R2</s (4012213)
Security Only[1]
Important
Information Disclosure None Windows Server 2012 R2</s (4012216)
Monthly Rollup[1]
Important
Information Disclosure 3205401 Windows Server 2016 for x64-based Systems (Server Core installation)[3] (4013429) Important
Information Disclosure 3213986

[1]Beginning with the October 2016 release, Microsoft has changed the update servicing model for Windows 7, Windows Server 2008 R2, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2. For more information, please see this Microsoft TechNet article.

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

[3] Windows 10 and Windows Server 2016 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog. Please note that effective December 13, 2016, Windows 10 and Windows Server 2016 details for the Cumulative Updates will be documented in Release Notes. Please refer to the Release Notes for OS Build numbers, Known Issues, and affected file list information.

*The Updates Replaced column shows only the latest update in any chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is provided on the Package Details tab).

Vulnerability Information

Microsoft Active Directory Federation Services Information Disclosure Vulnerability – CVE- 2017-0043

An information disclosure vulnerability exists when Windows Active Directory Federation Services (ADFS) honors XML External Entities. An authenticated attacker who successfully exploited this vulnerability would be able to read sensitive information about the target system.

To exploit this condition, an authenticated attacker would need to send a specially crafted request to the ADFS service. Note that the information disclosure vulnerability by itself would not be sufficient for an attacker to compromise a system. However, an attacker could combine this vulnerability with additional vulnerabilities to further exploit the system. The update addresses the vulnerability by causing ADFS to ignore these malicious entities.

The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list:

<table style=“border:1px solid black;”> Vulnerability title CVE number Publicly disclosed Exploited Microsoft Active Directory Federation Services Information Disclosure Vulnerability CVE-2017-0043 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Security Update Deployment

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

Acknowledgments

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

Disclaimer

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.

Revisions

  • V1.0 (March 14, 2017): Bulletin published.

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