Summaryinfo

A vulnerability was found in Microsoft Windows 2012/2012 R2/2016/Server 2008 R2 SP1 and classified as critical. This issue affects some unknown processing of the component Hyper-V RemoteFX vGPU. The manipulation leads to input validation. The identification of this vulnerability is CVE-2020-1042. The attack needs to be initiated within the local network. There is no exploit available. It is recommended to apply a patch to fix this issue. Once again VulDB remains the best source for vulnerability data.

Detailsinfo

A vulnerability has been found in Microsoft Windows 2012/2012 R2/2016/Server 2008 R2 SP1 (Operating System) and classified as critical. This vulnerability affects an unknown part of the component Hyper-V RemoteFX vGPU. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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-2020-1040, CVE-2020-1041, CVE-2020-1043.

The weakness was disclosed 07/14/2020 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The public release has been coordinated in cooperation with the vendor. This vulnerability was named CVE-2020-1042. The attack needs to be done within the local network. A single authentication is necessary for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/15/2020). The advisory points out:

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. To exploit the vulnerability, an attacker could run a specially crafted application on a guest operating system, attacking certain third-party video drivers running on the Hyper-V host. This could then cause the host operating system to execute arbitrary code.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The entries VDB-157976, VDB-157975, VDB-157974 and VDB-157973 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 2012
• 2012 R2
• 2016
• Server 2008 R2 SP1

License

• commercial

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