Denial of service in Microsoft Defender

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

Vulnerable software versions

Microsoft Security Essentials: All versions

Microsoft Forefront Endpoint Protection: 2010

Windows Defender: for Windows RT 8.1 - for Windows 10, Windows 10 1511, Windows 10 1607, Windows Server 2016, Windows 10 1703

CPE2.3

• cpe:2.3:a:microsoft:microsoft_security_essentials:*:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:microsoft_forefront_endpoint_protection:2010:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:windows_defender:for Windows RT 8.1:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:windows_defender:on Windows Server 2008:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:windows_defender: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.