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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0999 Remote Code Execution Vulnerability 4 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. 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