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AUSCERT External Security Bulletin Redistribution
ESB-2016.1132
This security update resolves vulnerabilities in the JScript and VBScript
11 May 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft JScript and VBScript
Publisher: Microsoft
Operating System: Windows Vista
Windows Server 2008
Windows Server 2008 R2
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0189 CVE-2016-0187
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-053
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Microsoft Security Bulletin MS16-053: Security Update for JScript and VBScript
(3156764)
Document Metadata
Bulletin Number: MS16-053
Bulletin Title: Security Update for JScript and VBScript
Severity: Critical
KB Article: 3156764
Version: 1.0
Published Date: May 10, 2016
Executive Summary
This security update resolves vulnerabilities in the JScript and VBScript
scripting engines in Microsoft Windows. The vulnerabilities could allow remote
code execution if a user visits a specially crafted website. An attacker who
successfully exploited these vulnerabilities could gain the same user rights
as the current user. If the current user is logged on with administrative user
rights, an attacker who successfully exploited these vulnerabilities could
take control of an affected system. An attacker could then install programs;
view, change, or delete data; or create new accounts with full user rights.
This security update is rated Critical for affected versions of the JScript
and VBScript scripting engines on supported releases of Windows Vista,
and Moderate on Windows Server 2008 and Windows Server 2008 R2.
Affected Software
Windows Vista
Windows Server 2008
Windows Server 2008 R2
Vulnerability Information
Multiple Scripting Engine Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that
the JScript and VBScript engines render when handling objects in memory in
Internet Explorer. The vulnerabilities could corrupt memory in such a way that
an attacker could execute arbitrary code in the context of the current user.
In a web-based attack scenario, an attacker could host a specially crafted
website that is designed to exploit the vulnerabilities through Internet
Explorer and then convince a user to view the website. An attacker could also
embed an ActiveX control marked "safe for initialization" in an application
or Microsoft Office document that hosts the IE rendering engine. The attacker
could also take advantage of compromised websites, and websites that accept
or host user-provided content or advertisements. These websites could contain
specially crafted content that could exploit the vulnerabilities.
An attacker who successfully exploited the vulnerabilities could gain the
same user rights as the current user. If the current user is logged on
with administrative user rights, an attacker who successfully exploited the
vulnerabilities could take control of an affected system. An attacker could
then install programs; view, change, or delete data; or create new accounts
with full user rights.
The update addresses the vulnerabilities by modifying how the JScript and
VBScript scripting engines 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 Exploited
Scripting Engine Memory Corruption Vulnerability CVE-2016-0187 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-0189 No Yes
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