Vulnerability Monitor

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CVE-2021-26887

<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>

Published

2021-03-11T16:15:15.800

Last Modified

2024-11-21T05:56:58.130

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:P

  • Access Vector: LOCAL
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

3.9

Impact Score

6.4

Weaknesses
  • Type: Primary
    CWE-59
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System microsoft windows_10 - Yes
Operating System microsoft windows_10 20h2 Yes
Operating System microsoft windows_10 1607 Yes
Operating System microsoft windows_10 1803 Yes
Operating System microsoft windows_10 1809 Yes
Operating System microsoft windows_10 1909 Yes
Operating System microsoft windows_10 2004 Yes
Operating System microsoft windows_7 - Yes
Operating System microsoft windows_8.1 - Yes
Operating System microsoft windows_rt_8.1 - Yes
Operating System microsoft windows_server_2008 - Yes
Operating System microsoft windows_server_2008 r2 Yes
Operating System microsoft windows_server_2012 - Yes
Operating System microsoft windows_server_2012 r2 Yes
Operating System microsoft windows_server_2016 - Yes
Operating System microsoft windows_server_2016 20h2 Yes
Operating System microsoft windows_server_2016 1909 Yes
Operating System microsoft windows_server_2016 2004 Yes
Operating System microsoft windows_server_2019 - Yes
References