CVE-2021-31187: Microsoft Windows WalletService Directory Junction Privilege Escalation Vulnerability
First published: Tue May 11 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 WalletService. By creating a directory junction, an attacker can abuse the service to create a file in an arbitrary location. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of SYSTEM.
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =1803 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1607 | |
| Windows 10 | =1607 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | ||
| Windows 10 | =1803 | |
| Windows 10 | =1803 | |
| Windows 10 | ||
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | ||
| Windows 10 | =20h2 | |
| Windows 10 | =1607 | |
| Windows 10 | =1803 | |
| Windows 10 | =1809 | |
| Windows 10 | =1909 | |
| Windows 10 | =2004 | |
| Microsoft Windows Operating System |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-31187?
CVE-2021-31187 has a high severity rating as it allows local attackers to escalate privileges in affected Windows installations.
How do I fix CVE-2021-31187?
To fix CVE-2021-31187, apply the latest security updates provided by Microsoft for affected versions of Windows.
Which versions of Windows are affected by CVE-2021-31187?
CVE-2021-31187 affects multiple versions of Windows 10 including 1607, 1803, 1809, 1909, 2004, and 20H2.
What type of attack does CVE-2021-31187 facilitate?
CVE-2021-31187 facilitates local privilege escalation attacks, allowing attackers to gain higher access rights on Windows systems.
Is there a workaround for CVE-2021-31187 if I can't update immediately?
Currently, there are no documented workarounds for CVE-2021-31187, so prompt updating is strongly recommended.
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