Vulnerability identifier: #VU6802

Vulnerability risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-8541

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Microsoft Malware Protection Engine
Client/Desktop applications / Antivirus software/Personal firewalls
Windows Defender
Client/Desktop applications / Antivirus software/Personal firewalls
Microsoft Security Essentials
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 compromise vulnerable system.

The vulnerability exists due to a boundary error when processing specially crafted files within Microsoft Malware Protection Engine (mpengine.dll). A remote attacker can create a specially crafted file, pass it to the affected application, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Update Microsoft Malware Protection Engine (mpengine.dll) to version 1.1.13804.0.

Vulnerable software versions

Microsoft Malware Protection Engine: 1.1.13704.0

Windows Defender: for Windows 8.1 - on Windows 7 for 32-bit Systems Service Pack 1

Microsoft Security Essentials: All versions

Microsoft Forefront Endpoint Protection: 2010

Microsoft Endpoint Protection: All versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032, 2016 RTM 15.01.0225.042

Windows Intune Endpoint Protection: All versions

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8541

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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. However, proof of concept for this vulnerability is available.