Microsoft App Installer Security Updates (December 2021)

The app installer installation on the remote host is missing a security update. It is, therefore, affected by a session spoofing vulnerability. An attacker can exploit this if the user opens a specially crafted attachment. This will allow the attacker to perform actions with the privileges of the...

Microsoft Temporarily Disables MSIX App Installers to Prevent Malware Abuse

Microsoft last week announced that it's temporarily disabling the MSIX ms-appinstaller protocol handler in Windows following evidence that a security vulnerability in the installer component was exploited by threat actors to deliver malware such as Emotet, TrickBot, and Bazaloader. MSIX, based on...

CVE-2021-43890

We have investigated reports of a spoofing vulnerability in AppX installer that affects Microsoft Windows. Microsoft is aware of attacks that attempt to exploit this vulnerability by using specially crafted packages that include the malware family known as Emotet/Trickbot/Bazaloader. An attacker...

PT-2021-6408 · Microsoft · Windows +1

Name of the Vulnerable Software and Affected Versions: Microsoft App Installer versions prior to 1.21.3421.0 Description: The issue is related to a spoofing vulnerability in the AppX installer that affects Microsoft Windows. This vulnerability can be exploited by attackers using specially crafted...