Microsoft knew a 0day from 2018 and fixed it in 2020

One of the security vulnerabilities fixed on Tuesday 11 August (Patch Tuesday) affects Windows 7, Windows 8.1, and several versions of Windows Server and the has reported seeing attacks using this defect.

This is a spoofing vulnerability in the and documented in CVE-2020-1464.

“A spoofing vulnerability exists when Windows incorrectly validates signatures . An attacker who successfully exploited this vulnerability could bypass security features and load files that were not properly signed. In an attack scenario, an attacker could bypass security features to prevent improperly signed files from being loaded," Microsoft said.

The company knew that exploit was operating and that it was publicly disclosed in 2018.

KrebsOnSercurity reveals that the forgery vulnerability was reported to Microsoft by Bernardo Quintero, director of VirusTotal.

"Microsoft has decided not to resolve this issue in the current versions of Windows and has agreed that we may publish this exploit." refers in Virus Total.

Tal Be'ery, security researcher and founder of KZen Networks, also points out that the flaw was discovered in the summer of 2018 and somehow Microsoft decided not to fix it.

Microsoft, on the other hand, does not answer why it left its customers' devices exposed for so long from 2018 and waiting until August 2020 to resolve the defect.

Note that devices running Windows 7, which are themselves exposed to the same attack, will not be updated as support expired in January 2020.

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Written by giorgos

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