Microsoft Windows up to Server 2019 File Signature signature verification

Summaryinfo

A vulnerability, which was classified as critical, was found in Microsoft Windows. Affected is an unknown function of the component File Signature Handler. Executing a manipulation can lead to signature verification. This vulnerability is tracked as CVE-2020-1464. The attack is restricted to local execution. Moreover, an exploit is present. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows (Operating System). It has been declared as critical. This vulnerability affects some unknown functionality of the component File Signature Handler. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files. In an attack scenario, an attacker could bypass security features intended to prevent improperly signed files from being loaded. The update addresses the vulnerability by correcting how Windows validates file signatures.

The weakness was disclosed 08/11/2020 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-2020-1464. The attack needs to be approached locally. A single authentication is required for exploitation. Technical details are unknown but a private exploit is available. The advisory points out:

A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files.

It is declared as attacked. This issue was added on 11/03/2021 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 05/03/2022:

Apply updates per vendor instructions.

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

The vulnerability is also documented in the databases at Zero-Day.cz (580) and EUVD (EUVD-2020-12339). The entries VDB-159536, VDB-159535, VDB-159534 and VDB-159531 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 7 SP1
• 8.1
• 10
• 10 1607
• 10 1709
• 10 1803
• 10 1809
• 10 1903
• 10 1909
• 10 2004
• RT 8.1
• Server 1903
• Server 1909
• Server 2004
• Server 2008 R2 SP1
• Server 2008 SP2
• Server 2012
• Server 2012 R2
• Server 2016
• Server 2019

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

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Once again VulDB remains the best source for vulnerability data.

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