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AUSCERT External Security Bulletin Redistribution
ESB-2016.0327
Microsoft Security Bulletin MS16-012: Security Update for Microsoft Windows
PDF Library to Address Remote Code Execution (3138938)
10 February 2016
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0058 CVE-2016-0046
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-012
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Microsoft Security Bulletin MS16-012: Security Update for Microsoft Windows
PDF Library to Address Remote Code Execution (3138938)
Bulletin Number: MS16-012
Bulletin Title: Security Update for Microsoft Windows PDF Library to Address
Remote Code Execution
Severity: Critical
KB Article: 3138938
Version: 1.0
Published Date: February 9, 2016
Executive Summary
This security update resolves vulnerabilities in Microsoft Windows. The more
severe of the vulnerabilities could allow remote code execution if Microsoft
Windows PDF Library improperly handles application programming interface (API)
calls, which could allow an attacker to run arbitrary code on the users
system. An attacker who successfully exploited the vulnerabilities could gain
the same user rights as the current user. Customers whose accounts are
configured to have fewer user rights on the system could be less impacted than
those who operate with administrative user rights. However, an attacker would
have no way to force users to download or open a malicious PDF document.
This security update is rated Critical for all supported editions of Windows
8.1, Windows Server 2012, Windows Server 2012 R2, and Windows 10.
Affected Software
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012
Windows Server 2012 R2
Windows 10 for 32-bit Systems[1]
Windows 10 for x64-based Systems[1]
Windows Server 2012 R2 (Server Core installation)
[1]Windows 10 updates are cumulative. In addition to containing non-security
updates, they also contain all of the security fixes for all of the Windows
10-affected vulnerabilities shipping with the monthly security release. The
update is available via the Windows Update Catalog.
Vulnerability Information
Microsoft Windows Reader Vulnerability - CVE-2016-0046
A remote code execution vulnerability exists in Microsoft Windows when a
specially crafted file is opened in Windows Reader. An attacker who
successfully exploited this vulnerability could cause arbitrary code to
execute in the context of the current user. If a user is logged on with
administrative user rights, an attacker could take control of the affected
system. An attacker could then install programs; view, change, or delete data;
or create new accounts with full user rights. Customers whose accounts are
configured to have fewer user rights on the system could be less impacted than
those who operate with administrative user rights.
For an attack to succeed, a user must open a specially crafted Windows Reader
file with an affected version of Windows Reader. In an email attack scenario,
an attacker would have to convince the user to open a specially crafted
Windows Reader file. The update addresses the vulnerability by modifying how
Windows Reader parses files.
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 Windows
Reader Vulnerability CVE-2016-0046 No No
Microsoft PDF Library Buffer Overflow Vulnerability - CVE-2016-0058
A vulnerability exists in Microsoft Windows PDF Library when it improperly
handles application programming interface (API) calls, which could allow an
attacker to run arbitrary code on the users system. An attacker who
successfully exploited this vulnerability could gain the same user rights as
the current user. Customers whose accounts are configured to have fewer user
rights on the system could be less impacted than those who operate with
administrative user rights.
An attacker would have no way to force a user to download or run malicious
code in a PDF document. The update addresses the vulnerability by changing how
memory is handled for API calls to the PDF Library.
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 PDF Library Buffer
Overflow Vulnerability CVE-2016-0058 No No
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