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AUSCERT External Security Bulletin Redistribution
ESB-2018.0999
Remote Code Execution Vulnerability
4 April 2018
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AusCERT Security Bulletin Summary
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Product: Microsoft Malware Protection Engine
Publisher: Microsoft
Operating System: Windows
Impact/Access: Administrator Compromise -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0986
Original Bulletin:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0986
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CVE-2018-0986
Microsoft Malware Protection Engine Remote Code Execution Vulnerability
Security Vulnerability
Published: 04/03/2018
MITRE CVE-2018-0986
A remote code execution vulnerability exists when the Microsoft Malware
Protection Engine does not properly scan a specially crafted file, leading to
memory corruption. An attacker who successfully exploited this vulnerability
could execute arbitrary code in the security context of the LocalSystem
account and take control of the system. An attacker could then install
programs; view, change, or delete data; or create new accounts with full user
rights.
To exploit this vulnerability, a specially crafted file must be scanned by an
affected version of the Microsoft Malware Protection Engine. There are many
ways that an attacker could place a specially crafted file in a location that
is scanned by the Microsoft Malware Protection Engine. For example, an
attacker could use a website to deliver a specially crafted file to the
victim's system that is scanned when the website is viewed by the user. An
attacker could also deliver a specially crafted file via an email message or
in an Instant Messenger message that is scanned when the file is opened. In
addition, an attacker could take advantage of websites that accept or host
user-provided content, to upload a specially crafted file to a shared location
that is scanned by the Malware Protection Engine running on the hosting
server.
If the affected antimalware software has real-time protection turned on, the
Microsoft Malware Protection Engine will scan files automatically, leading to
exploitation of the vulnerability when the specially crafted file is scanned.
If real-time scanning is not enabled, the attacker would need to wait until a
scheduled scan occurs in order for the vulnerability to be exploited. All
systems running an affected version of antimalware software are primarily at
risk.
The update addresses the vulnerability by correcting the manner in which the
Microsoft Malware Protection Engine scans specially crafted files.
Note: Typically, no action is required of enterprise administrators or end
users to install updates for the Microsoft Malware Protection Engine, because
the built-in mechanism for the automatic detection and deployment of updates
will apply the update within 48 hours of release. The exact time frame depends
on the software used, Internet connection, and infrastructure configuration.
Exploitability Assessment
The following table provides an exploitability assessment for this
vulnerability at the time of original publication.
Publicly Disclosed Exploited Latest Software Release Older Software Release Denial of Service
No No 2 - Exploitation Less Likely 2 - Exploitation Less Likely Not Applicable
Affected Products
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 the Microsoft Support Lifecycle.
Product Platform Impact Severity
Microsoft Exchange - Remote Code Execution Critical
Server 2013
Microsoft Exchange - Remote Code Execution Critical
Server 2016
Microsoft Forefront - Remote Code Execution Critical
Endpoint Protection 2010
Microsoft Security - Remote Code Execution Critical
Essentials
Windows Defender Windows 10 Version 1703 for 32-bit Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1703 for x64-based Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1709 for 32-bit Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1709 for 64-based Systems Remote Code Execution Critical
Windows Defender Windows Server, version 1709 (Server Core Installation) Remote Code Execution Critical
Windows Defender Windows 10 for 32-bit Systems Remote Code Execution Critical
Windows Defender Windows 10 for x64-based Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1511 for 32-bit Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1511 for x64-based Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1607 for 32-bit Systems Remote Code Execution Critical
Windows Defender Windows 10 Version 1607 for x64-based Systems Remote Code Execution Critical
Windows Defender Windows Server 2016 Remote Code Execution Critical
Windows Defender Windows Server 2016 (Server Core installation) Remote Code Execution Critical
Windows Defender Windows 7 for 32-bit Systems Service Pack 1 Remote Code Execution Critical
Windows Defender Windows 7 for x64-based Systems Service Pack 1 Remote Code Execution Critical
Windows Defender Windows 8.1 for 32-bit systems Remote Code Execution Critical
Windows Defender Windows 8.1 for x64-based systems Remote Code Execution Critical
Windows Defender Windows RT 8.1 Remote Code Execution Critical
Windows Defender Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 Remote Code Execution Critical
Windows Defender Windows Server 2008 R2 for x64-based Systems Service Pack 1 Remote Code Execution Critical
Windows Defender Windows Server 2008 R2 for x64-based Systems Service Pack 1 Remote Code Execution Critical
(Server Core installation)
Windows Defender Windows Server 2012 Remote Code Execution Critical
Windows Defender Windows Server 2012 (Server Core installation) Remote Code Execution Critical
Windows Defender Windows Server 2012 R2 Remote Code Execution Critical
Windows Defender Windows Server 2012 R2 (Server Core installation) Remote Code Execution Critical
Windows Intune Endpoint Protection Remote Code Execution Critical
Mitigations
Microsoft has not identified any mitigating factors for this vulnerability.
Workarounds
Microsoft has not identified any workarounds for this vulnerability.
FAQ
References Identification
Last version of the Microsoft Malware Protection Engine affected by this vulnerability Version 1.1.14600.4
First version of the Microsoft Malware Protection Engine with this vulnerability addressed Version 1.1.14700.5
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