CVE-2021-26887
Published: Mar 11, 2021
Modified: Nov 19, 2024
CVSS v3.1
7.8
Description
<p>An elevation of privilege vulnerability exists in Microsoft Windows when Folder redirection has been enabled via Group Policy. When folder redirection file server is co-located with Terminal server, an attacker who successfully exploited the vulnerability would be able to begin redirecting another user's personal data to a created folder.</p> <p>To exploit the vulnerability, an attacker can create a new folder under the Folder Redirection root path and create a junction on a newly created User folder. When the new user logs in, Folder Redirection would start redirecting to the folder and copying personal data.</p> <p>This elevation of privilege vulnerability can only be addressed by reconfiguring Folder Redirection with Offline files and restricting permissions, and NOT via a security update for affected Windows Servers. See the <strong>FAQ</strong> section of this CVE for configuration guidance.</p>
| Vendor | Product | Versions |
|---|---|---|
Microsoft | Windows 10 Version 2004 | affected N/A |
Microsoft | Windows Server version 2004 | affected N/A |
Microsoft | Windows 10 Version 20H2 | affected N/A |
Microsoft | Windows Server version 20H2 | affected N/A |
Microsoft | Windows 10 Version 1803 | affected N/A |
Microsoft | Windows 10 Version 1809 | affected N/A |
Microsoft | Windows Server 2019 | affected N/A |
Microsoft | Windows Server 2019 (Server Core installation) | affected N/A |
Microsoft | Windows 10 Version 1909 | affected N/A |
Microsoft | Windows Server, version 1909 (Server Core installation) | affected N/A |
Microsoft | Windows 10 Version 1507 | affected N/A |
Microsoft | Windows 10 Version 1607 | affected N/A |
Microsoft | Windows Server 2016 | affected N/A |
Microsoft | Windows Server 2016 (Server Core installation) | affected N/A |
Microsoft | Windows 7 | affected N/A |
Microsoft | Windows 7 Service Pack 1 | affected N/A |
Microsoft | Windows 8.1 | affected N/A |
Microsoft | Windows Server 2008 Service Pack 2 | affected N/A |
Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | affected N/A |
Microsoft | Windows Server 2008 Service Pack 2 | affected N/A |
Microsoft | Windows Server 2008 R2 Service Pack 1 | affected N/A |
Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | affected N/A |
Microsoft | Windows Server 2012 | affected 6.2.0 - < publication |
Microsoft | Windows Server 2012 (Server Core installation) | affected 6.2.0 - < publication |
Microsoft | Windows Server 2012 R2 | affected N/A |
Microsoft | Windows Server 2012 R2 (Server Core installation) | affected N/A |
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
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