Remote code execution in Microsoft Windows SMBv3



Published: 2020-03-11 | Updated: 2022-06-27
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-0796
CWE-ID CWE-20
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
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Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 12.03.2020

Assigned CVE-ID to the vulnerability, changed bulletin status to patched.

Updated: 13.03.2020

Added link to PoC, changed CVSS metrics.

1) Input validation error

EUVDB-ID: #VU25980

Risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-0796

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

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

The vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. A remote attacker can trick a client to connect to a malicious SMB server and execute arbitrary code on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 10 1903 - 10 1909

Windows Server: 2019 1903 - 2019 1909


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200005
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796
http://github.com/Dhoomralochana/Scanners-for-CVE-2020-0796-Testing
http://github.com/ClarotyICS/CVE2020-0796

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.



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