Microsoft Security Bulletin MS17-016 - Important

Security Update for Windows IIS (4013074)

Published: March 14, 2017

Version: 1.0

This security update resolves a vulnerability in Microsoft Internet Information Services (IIS). The vulnerability could allow elevation of privilege if a user clicks a specially crafted URL which is hosted by an affected Microsoft IIS server. An attacker who successfully exploited this vulnerability could potentially execute scripts in the user’s browser to obtain information from web sessions.

This security update is rated Important for all supported releases of Microsoft Windows.

The security update addresses the vulnerability by modifying the way that Microsoft IIS Server sanitizes web requests.

For more information about this update, see Microsoft Knowledge Base Article 4013074.

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.

Operating System

Microsoft IIS Server XSS Elevation of Privilege Vulnerability - CVE-2017-0055

Updates Replaced*

Windows Vista

Windows Vista Service Pack 2
(4012373)

Important 
Elevation of Privilege

None

Windows Vista x64 Edition Service Pack 2
(4012373)

Important 
Elevation of Privilege

None

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(4012212)
Security Only[1]

Important 
Elevation of Privilege

None

Windows 7 for 32-bit Systems Service Pack 1
(4012215)
Monthly Rollup[1]

Important 
Elevation of Privilege

3212646

Windows 7 for x64-based Systems Service Pack 1
(4012212)
Security Only[1]

Important 
Elevation of Privilege

None

Windows 7 for x64-based Systems Service Pack 1
(4012215)
Monthly Rollup[1]

Important 
Elevation of Privilege

3212646

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
(4012373)

Important 
Elevation of Privilege

None

Windows Server 2008 for x64-based Systems Service Pack 2
(4012373)

Important 
Elevation of Privilege

None

Windows Server 2008 for Itanium-based Systems Service Pack 2
(4012373)

Important 
Elevation of Privilege

None

Windows Server 2008 R2

Windows Server 2008 R2 for 32-bit Systems Service Pack 2
(4012212)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2008 R2 for x64-based Systems Service Pack 2
(4012215)
Monthly Rollup[1]

Important 
Elevation of Privilege

3212646

Windows Server 2008 R2 for Itanium-based Systems Service Pack 2
(4012212)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2008 R2 for Itanium-based Systems Service Pack 2
(4012215)
Monthly Rollup[1]

Important 
Elevation of Privilege

3212646

Windows 8.1

Windows 8.1 for 32-bit Systems
(4012213)
Security Only[1]

Important 
Elevation of Privilege

None

Windows 8.1 for 32-bit Systems
(4012216)
Monthly Rollup[1]

Important 
Elevation of Privilege

3205401

Windows 8.1 for x64-based Systems
(4012213)
Security Only[1]

Important 
Elevation of Privilege

None

Windows 8.1 for x64-based Systems
(4012216)
Monthly Rollup[1]

Important 
Elevation of Privilege

3205401

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(4012214)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2012
(4012217)
Monthly Rollup[1]

Important 
Elevation of Privilege

3205409

Windows Server 2012 R2
(4012213)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2012 R2
(4012216)
Monthly Rollup[1]

Important 
Elevation of Privilege

3205401

Windows RT 8.1

Windows RT 8.1[2]
(4012216)
Monthly Rollup

Important 
Elevation of Privilege

3205401

Windows 10

Windows 10 for 32-bit Systems [3]
(4012606)

Important 
Elevation of Privilege

3210720

Windows 10 for x64-based Systems [3]
(4012606)

Important 
Elevation of Privilege

3210720

Windows 10 Version 1511 for 32-bit Systems [3]
(4013198)

Important 
Elevation of Privilege

3210721

Windows 10 Version 1511 for x64-based Systems [3]
(4013198)

Important 
Elevation of Privilege

3210721

Windows 10 Version 1607 for 32-bit Systems [3]
(4013429)

Important 
Elevation of Privilege

3213986

Windows 10 Version 1607 for x64-based Systems [3]
(4013429)

Important 
Elevation of Privilege

3213986

Windows Server 2016

Windows Server 2016 for x64-based Systems [3]
(4013429)

Important 
Elevation of Privilege

3213986

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(4012373)

Important 
Elevation of Privilege

None

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(4012373)

Important 
Elevation of Privilege

None

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(4012212)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(Server Core installation)
(4012215)
Monthly Rollup[1]

Important 
Elevation of Privilege

3212646

Windows Server 2012 (Server Core installation)
(4012214)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2012 (Server Core installation)
(4012217)
Monthly Rollup[1]

Important 
Elevation of Privilege

3205409

Windows Server 2012 R2 (Server Core installation)
(4012213)
Security Only[1]

Important 
Elevation of Privilege

None

Windows Server 2012 R2 (Server Core installation)
(4012216)
Monthly Rollup[1]

Important 
Elevation of Privilege

3205401

Windows Server 2016 for x64-based Systems [3] (Server Core installation)
(4013429)

Important 
Elevation of Privilege

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

*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).

Microsoft IIS Server XSS Elevation of Privilege Vulnerability – CVE-2017-0055

An elevation of privilege vulnerability exists when Microsoft IIS Server fails to properly sanitize a specially crafted request. An attacker who successfully exploited this vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. These attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on behalf of the victim, and inject malicious content in the victim’s browser.

For this vulnerability to be exploited, a user must click a specially crafted URL.

In an email attack scenario, an attacker could exploit the vulnerability by sending an email message containing the specially crafted URL to the user and by convincing the user to click on the specially crafted URL.

In a web-based attack scenario, an attacker would have to host a website that contains a specially crafted URL. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted website. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an instant messenger or email message that directs them to the affected website by way of a specially crafted URL.

The security update addresses the vulnerability by correcting how Microsoft IIS Server sanitizes web requests.

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

Vulnerability title

CVE number

Publicly disclosed

Exploited

Microsoft IIS Server XSS Elevation of Privilege Vulnerability

CVE-2017-0055

No

No

Mitigating Factors

Microsoft has not identified any mitigating factors for 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 (March 14, 2017): Bulletin published.
Page generated 2017-03-11 14:42-08:00.
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