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AUSCERT External Security Bulletin Redistribution
ESB-2009.1264
Vulnerability in JScript Scripting Engine Could Allow Remote Code Execution
9 September 2009
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AusCERT Security Bulletin Summary
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Product: JScript
Publisher: Microsoft
Operating System: Windows 2000
Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2009-1920
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS09-045.mspx
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Microsoft Security Bulletin MS09-045 - Critical
Vulnerability in JScript Scripting Engine Could Allow Remote Code Execution
(971961)
Published: September 08, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in the
JScript scripting engine that could allow remote code execution if a user
opened a specially crafted file or visited a specially crafted Web site and
invoked a malformed script. If a user is logged on with administrative user
rights, an attacker who successfully exploited this vulnerability could take
complete control of an affected system. An attacker could then install
programs; view, change, or delete data; or create new accounts with full user
rights. Users whose accounts are configured to have fewer user rights on the
system could be less impacted than users who operate with administrative
user rights.
This security update is rated Critical for JScript 5.1 on Microsoft Windows
2000 Service Pack 4 and Critical for JScript 5.6, JScript 5.7 and JScript
5.8 on all supported releases of the Windows operating system except Windows
7 and Windows Server 2008 R2. For more information, see the subsection,
Affected and Non-Affected Software, in this section.
This security update addresses the vulnerability by modifying the way that
the JScript engine processes scripts in Web pages. For more information
about the vulnerability, see the Frequently Asked Questions (FAQ) subsection
for the specific vulnerability entry under the next section, Vulnerability
Information.
Recommendation. The majority of customers have automatic updating enabled
and will not need to take any action because this security update will be
downloaded and installed automatically. Customers who have not enabled
automatic updating need to check for updates and install this update
manually. For information about specific configuration options in automatic
updating, see Microsoft Knowledge Base Article 294871.
For administrators and enterprise installations, or end users who want to
install this security update manually, Microsoft recommends that customers
apply the update immediately using update management software, or by checking
for updates using the Microsoft Update service.
See also the section, Detection and Deployment Tools and Guidance, later
in this bulletin.
Known Issues. Microsoft Knowledge Base Article 971961 documents the
currently known issues that customers may experience when installing
this security update. The article also documents recommended solutions
for these issues.
Affected Software
Microsoft Windows 2000 Service Pack 4:
JScript 5.1 and JScript 5.6
Windows XP Service Pack 2:
JScript 5.6
JScript 5.7
Windows XP Service Pack 3:
JScript 5.7
Windows XP Service Pack 2 and Windows XP Service Pack 3:
JScript 5.8
Windows XP Professional x64 Edition Service Pack 2:
JScript 5.6
JScript 5.7
JScript 5.8
Windows Server 2003 Service Pack 2:
JScript 5.6
JScript 5.7
JScript 5.8
Windows Server 2003 x64 Edition Service Pack 2:
JScript 5.6
JScript 5.7
JScript 5.8
Windows Server 2003 with SP2 for Itanium-based Systems:
JScript 5.6
JScript 5.7
Windows Vista, Windows Vista Service Pack 1, and
Windows Vista Service Pack 2:
JScript 5.7
JScript 5.8
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1,
and Windows Vista x64 Edition Service Pack 2:
JScript 5.7
JScript 5.8
Windows Server 2008 for 32-bit Systems and
Windows Server 2008 for 32-bit Systems Service Pack 2:
JScript 5.7
JScript 5.8
Windows Server 2008 for x64-based Systems and
Windows Server 2008 for x64-based Systems Service Pack 2:
JScript 5.7
JScript 5.8
Windows Server 2008 for Itanium-based Systems and
Windows Server 2008 for Itanium-based Systems Service Pack 2:
JScript 5.7
Vulnerability Information
JScript Remote Code Execution Vulnerability - CVE-2009-1920
A remote code execution vulnerability exists in the way that the JScript
scripting engine processes scripts in Web pages. The vulnerability could
allow remote code execution if a user opened a specially crafted file or
visited a Web site that is running a specially crafted script. If a user is
logged on with administrative user rights, an attacker who successfully
exploited this vulnerability could take complete control of an affected system.
An attacker could then install programs; view, change, or delete data; or
create new accounts with full user rights. Users whose accounts are configured
to have fewer user rights on the system could be less impacted than users who
operate with administrative user rights.
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