Security Update for Microsoft Windows PDF Library (3188733)Published: September 13, 2016Version: 1.0This security update resolves vulnerabilities in Microsoft Windows.

The vulnerabilities could allow information disclosure if a user views specially crafted PDF content online or opens a specially crafted PDF document.This security update is rated Important for all supported editions of Windows 8.1, Windows Server 2012, Windows RT 8.1, Windows Server 2012 R2, and Windows 10.

For more information, see the Affected Software and Vulnerability Severity Ratings section.The security update addresses the vulnerabilities by correcting how certain functions handle objects in memory.

For more information about the vulnerability, see the Vulnerability Information section.For more information about this update, see Microsoft Knowledge Base Article 3188733.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 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 September bulletin summary.[1]This update is only available via Windows Update.[2]Windows 10 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.Note The vulnerabilities discussed in this bulletin affect Windows Server 2016 Technical Preview 5.

To be protected from the vulnerabilities, Microsoft recommends that customers running this operating system apply the current update, which is available from Windows Update. *The Updates Replaced column shows only the latest update in any chain of superseded updates.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).The PDF Library vulnerabilities discussed in this bulletin are also discussed in the Microsoft Edge bulletin being released in September.

To be protected from the vulnerabilities, do I need to install multiple updates for my particular system and Microsoft Edge configuration? 

Customers running Windows 10 systems only need to install the one cumulative update for their system to be protected from CVE-2016-3370 and CVE-2016-3374.

The PDF library vulnerabilities also appear in the Microsoft Edge bulletin (MS16-105) because on Windows 10 systems the security fixes for these vulnerabilities reside in the Microsoft Edge component that is shipping in the cumulative update.Multiple PDF Library Information Disclosure VulnerabilitiesMultiple information disclosure vulnerabilities exist in the way that the Windows PDF Library handles objects in memory.

An attacker who successfully exploited the vulnerabilities could obtain information to further compromise a target system.In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerabilities.

Additionally, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could be used to exploit the vulnerabilities. However, in all cases an attacker would have no way to force users to view attacker-controlled content.
Instead, an attacker would have to convince users to take action.

For example, an attacker could trick users into clicking a link that takes them to the attacker’s site.The update addresses the vulnerabilities by correcting how certain functions handle 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


PDF Library Information Disclosure Vulnerability




PDF Library Information Disclosure Vulnerability




Mitigating FactorsMicrosoft has not identified any mitigating factors for these vulnerabilities.WorkaroundsMicrosoft has not identified any workarounds for these vulnerabilities.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 (September 13, 2016): Bulletin published.
Page generated 2016-09-12 09:57-07:00.

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