Denial of service in Microsoft Defender



Published: 2019-09-23
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-1255
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Microsoft Security Essentials
Client/Desktop applications / Antivirus software/Personal firewalls

Windows Defender
Client/Desktop applications / Antivirus software/Personal firewalls

Microsoft Forefront Endpoint Protection
Server applications / DLP, anti-spam, sniffers

Vendor Microsoft

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU21290

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1255

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of files within the Microsoft Malware Protection Engine in Microsoft Defender. A remote attacker can create a specially crafted file, trick the victim into executing it and prevent legitimate accounts from executing legitimate system binaries. 

Mitigation

Install updates from vendor's website.
This vulnerability was addressed in Microsoft Malware Protection Engine 1.1.16400.2.

Vulnerable software versions

Microsoft Security Essentials: All versions

Microsoft Forefront Endpoint Protection: 2010

Windows Defender: for Windows 8.1 - on Windows Server 2012

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1255


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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



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