Vulnerability identifier: #VU9598

Vulnerability risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-11940

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Security Essentials
Client/Desktop applications / Antivirus software/Personal firewalls
Windows Defender
Client/Desktop applications / Antivirus software/Personal firewalls
Microsoft Endpoint Protection
Client/Desktop applications / Antivirus software/Personal firewalls
Windows Intune Endpoint Protection
Client/Desktop applications / Antivirus software/Personal firewalls
Microsoft Forefront Endpoint Protection
Server applications / DLP, anti-spam, sniffers
Microsoft Exchange Server
Server applications / Mail servers

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when scanning by the target Microsoft Malware Protection Engine. A remote attacker can trick the victim into opening a specially crafted file, trigger memory corruption and execute arbitrary code with LocalSystem privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update to version 1.1.14405.2.

Vulnerable software versions

Microsoft Security Essentials: All versions

Windows Defender: for Windows 8.1 - on Windows Server 2008

Microsoft Forefront Endpoint Protection: 2010

Microsoft Exchange Server: 2016 RTM 15.01.0225.042, 2013 RTM 15.00.0516.032

Microsoft Endpoint Protection: All versions

Windows Intune Endpoint Protection: All versions

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11940

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.