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CVE-2020-1040: Microsoft Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability

CVE-2020-1040 is rated critical with a CVSS v3.1 base score of 9.0 and affects Microsoft Hyper-V RemoteFX, along with 3 other products in NVD’s configuration data. Per its scoring, it can be exploited without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available. CISA added it to its Known Exploited Vulnerabilities catalog on 2021-11-03, which means exploitation in the wild has been observed.

Vulnerability description

A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036, CVE-2020-1041, CVE-2020-1042, CVE-2020-1043.

Severity breakdown

CVSS v3.1 9.0: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

  • Attack vector: Adjacent. The attacker must be on the same shared network segment.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: Low. A basic user account is enough.
  • User interaction: None. No action from any user is needed.
  • Scope: Changed. Impact reaches beyond the vulnerable component to other resources.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-20: Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Affected products

  • Microsoft Windows Server 2008: r2
  • Microsoft Windows Server 2012: all versions listed by NVD; r2
  • Microsoft Windows Server 2016: all versions listed by NVD

References