#VU28870 Input validation error in Windows and Windows Server - CVE-2020-1284

Vulnerability identifier: #VU28870

Vulnerability risk: Medium

CVSSv4.0: 4.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-1284

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

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

The vulnerability exists due to the way Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests.

To exploit the vulnerability against a server, an authenticated attacker can send a specially crafted packet to a targeted SMBv3 server. To exploit the vulnerability against a client, an unauthenticated attacker would need to configure  malicious SMBv3 server and convince a user to connect to it.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows: 10 2004 10.0.19041.264

Windows Server: 2019 2004

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1284

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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.