<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>
References
| Link | Resource |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26887 | Patch Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
29 Dec 2023, 20:15
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (en) <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> |
03 May 2022, 16:04
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-59 |
12 Mar 2021, 21:34
| Type | Values Removed | Values Added |
|---|---|---|
| References | (MISC) https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26887 - Patch, Vendor Advisory | |
| CWE | CWE-269 | |
| CPE | cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* |
|
| CVSS |
v2 : v3 : |
v2 : 4.6
v3 : 7.8 |
11 Mar 2021, 16:26
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2021-03-11 16:15
Updated : 2023-12-29 20:15
NVD link : CVE-2021-26887
Mitre link : CVE-2021-26887
CVE.ORG link : CVE-2021-26887
JSON object : View
Products Affected
microsoft
- windows_server_2008
- windows_rt_8.1
- windows_8.1
- windows_server_2012
- windows_10
- windows_server_2016
- windows_server_2019
- windows_7
CWE
CWE-59
Improper Link Resolution Before File Access ('Link Following')