CVE Vulnerabilities

CVE-2021-41379

Improper Link Resolution Before File Access ('Link Following')

Published: Nov 10, 2021 | Modified: Jul 24, 2024
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
4.6 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu

Windows Installer Elevation of Privilege Vulnerability

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name Vendor Start Version End Version
Windows_10_1507 Microsoft * 10.0.10240.19119 (excluding)
Windows_10_1607 Microsoft * 10.0.14393.4770 (excluding)
Windows_10_1809 Microsoft * 10.0.17763.2300 (excluding)
Windows_10_1909 Microsoft * 10.0.18363.1916 (excluding)
Windows_10_2004 Microsoft * 10.0.19041.1348 (excluding)
Windows_10_20h2 Microsoft * 10.0.19042.1348 (excluding)
Windows_10_21h1 Microsoft * 10.0.19043.1348 (excluding)
Windows_11_21h2 Microsoft * 10.0.22000.318 (excluding)
Windows_7 Microsoft –sp1 (including) –sp1 (including)
Windows_8.1 Microsoft - (including) - (including)
Windows_rt_8.1 Microsoft - (including) - (including)
Windows_server_2004 Microsoft * 10.0.19041.1348 (excluding)
Windows_server_2008 Microsoft –sp2 (including) –sp2 (including)
Windows_server_2008 Microsoft r2-sp1 (including) r2-sp1 (including)
Windows_server_2012 Microsoft - (including) - (including)
Windows_server_2012 Microsoft r2 (including) r2 (including)
Windows_server_2016 Microsoft * 10.0.14393.4770 (excluding)
Windows_server_2019 Microsoft * 10.0.17763.2300 (excluding)
Windows_server_2022 Microsoft * 10.0.20348.350 (excluding)
Windows_server_20h2 Microsoft * 10.0.19042.1348 (excluding)

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References