CVE-2021-26887
Assigner: microsoft
Published: 2021-03-11T15:42:16
State: PUBLISHED
title: Microsoft Windows Folder Redirection Elevation of Privilege Vulnerability
datePublic: 2021-03-09T08:00:00+00:00
affected: vendor: Microsoft
product: Windows 10 Version 2004
platforms: 32-bit Systems
ARM64-based Systems
x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server version 2004
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 10 Version 20H2
platforms: 32-bit Systems
ARM64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server version 20H2
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 10 Version 1803
platforms: 32-bit Systems
x64-based Systems
ARM64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 10 Version 1809
platforms: 32-bit Systems
x64-based Systems
ARM64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2019
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2019 (Server Core installation)
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 10 Version 1909
platforms: 32-bit Systems
x64-based Systems
ARM64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server, version 1909 (Server Core installation)
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 10 Version 1507
platforms: 32-bit Systems
x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 10 Version 1607
platforms: 32-bit Systems
x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2016
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2016 (Server Core installation)
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 7
platforms: 32-bit Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 7 Service Pack 1
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows 8.1
platforms: 32-bit Systems
x64-based Systems
ARM64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2008 Service Pack 2
platforms: 32-bit Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2008 Service Pack 2 (Server Core installation)
platforms: 32-bit Systems
x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2008  Service Pack 2
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2008 R2 Service Pack 1
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2008 R2 Service Pack 1 (Server Core installation)
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2012
cpes: cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
platforms: x64-based Systems
versions: version: 6.2.0
lessThan: publication
versionType: custom
status: affected
vendor: Microsoft
product: Windows Server 2012 (Server Core installation)
cpes: cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
platforms: x64-based Systems
versions: version: 6.2.0
lessThan: publication
versionType: custom
status: affected
vendor: Microsoft
product: Windows Server 2012 R2
platforms: x64-based Systems
versions: version: N/A
status: affected
vendor: Microsoft
product: Windows Server 2012 R2 (Server Core installation)
platforms: x64-based Systems
versions: version: N/A
status: affected
descriptions: value: <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>

problemTypes: descriptions: description: Elevation of Privilege
type: Impact
metrics: format: CVSS
scenarios: value: GENERAL
cvssV3_1: version: 3.1
baseSeverity: HIGH
baseScore: 7.8
vectorString: 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