CVE-2021-41347: Microsoft Windows AppX Deployment Service Directory Junction Privilege Escalation Vulnerability
First published: Tue Oct 12 2021(Updated: )
This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AppX Deployment Service. By creating a directory junction, an attacker can abuse the service to delete the contents of a chosen directory. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 10 | =21H1 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 10 | =21H1 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 10 | =21H1 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | ||
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows Server | =20H2 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows 10 | ||
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows Server | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows 10 | ||
| Microsoft Windows 10 | =20h2 | |
| Microsoft Windows 10 | =21h1 | |
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 11 | ||
| Microsoft Windows 11 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | =20h2 | |
| Microsoft Windows Server 2016 | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2022 | ||
| =20h2 | ||
| =21h1 | ||
| =1607 | ||
| =1809 | ||
| =1909 | ||
| =2004 | ||
| =20h2 | ||
| =2004 | ||
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Reference Links
Frequently Asked Questions
What is CVE-2021-41347 vulnerability?
CVE-2021-41347 is a privilege escalation vulnerability in Microsoft Windows AppX Deployment Service, allowing local attackers to escalate privileges on affected installations of Windows.
How does CVE-2021-41347 vulnerability work?
An attacker with the ability to execute low-privileged code on the target system can exploit this vulnerability to escalate privileges.
Which systems are affected by CVE-2021-41347?
Microsoft Windows 10 (versions 1607, 1909, 2004, 20H2, 21H1), Windows 11 (version 21H2), Windows Server 2016 (Server Core installation), Windows Server 2019, and Windows Server 2022 are affected by CVE-2021-41347.
What is the severity of CVE-2021-41347 vulnerability?
The severity of CVE-2021-41347 vulnerability is high, with a CVSS score of 7.8.
How can I fix CVE-2021-41347 vulnerability?
To fix CVE-2021-41347 vulnerability, apply the relevant patches provided by Microsoft or follow the recommended remediation steps outlined in the Microsoft security advisory.
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