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CVE-2021-26887
CVE ID
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CVE-2021-26887
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
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.
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CVSS V3 Severity and Metrics
General Information
Vendors
- microsoft
Products
- windows 10 -,
- windows 10 1607,
- windows 10 1803,
- windows 10 1809,
- windows 10 1909,
- windows 10 2004,
- windows 10 20h2,
- windows 7 -,
- windows 8.1 -,
- windows rt 8.1 -,
- windows server 2008 -,
- windows server 2008 r2,
- windows server 2012 -,
- windows server 2012 r2,
- windows server 2016 -,
- windows server 2016 1909,
- windows server 2016 2004,
- windows server 2016 20h2,
- windows server 2019 -
References
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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