Mar 2021: Microsoft Windows Folder Redirection Elevation of Privilege Vulnerability
CVE-2021-26887 Published on March 11, 2021

Microsoft Windows Folder Redirection Elevation of Privilege Vulnerability
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. 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. 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 FAQ section of this CVE for configuration guidance.

Vendor Advisory NVD


Products Associated with CVE-2021-26887

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Microsoft Windows 10
 
Microsoft Windows 7
 
Microsoft Windows 8.1
 
Microsoft Windows Rt 8 1
 
Microsoft Windows Server 2008
 
Microsoft Windows Server 2012
 
Microsoft Windows Server 2016
 
Microsoft Windows Server 2019
 
Microsoft Windows Server 2004
 
Microsoft Windows Server 20h2
 
Microsoft Windows 10 1909
 
Microsoft Windows Server 1909
 
Microsoft Windows 10 1507
 
Microsoft Windows Server 2008 Sp2
 
Microsoft Windows Server 2008 R2
 
Microsoft Windows Server 2012 R2
 

Affected Versions

Microsoft Windows 10 Version 1507: Microsoft Windows 10 Version 1607: Microsoft Windows 10 Version 1803: Microsoft Windows 10 Version 1809: Microsoft Windows 10 Version 1809: Microsoft Windows 10 Version 1909: Microsoft Windows 10 Version 2004: Microsoft Windows 10 Version 20H2: Microsoft Windows 7: Microsoft Windows 7 Service Pack 1: Microsoft Windows 8.1: Microsoft Windows Server 2008 R2 Service Pack 1: Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): Microsoft Windows Server 2008 Service Pack 2: Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): Microsoft Windows Server 2012: Microsoft Windows Server 2012 (Server Core installation): Microsoft Windows Server 2012 R2: Microsoft Windows Server 2012 R2 (Server Core installation): Microsoft Windows Server 2016: Microsoft Windows Server 2016 (Server Core installation): Microsoft Windows Server 2019: Microsoft Windows Server 2019 (Server Core installation): Microsoft Windows Server version 2004: Microsoft Windows Server version 20H2: Microsoft Windows Server, version 1909 (Server Core installation):

Exploit Probability

EPSS
1.06%
Percentile
61.99%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.