CVE Vulnerabilities

CVE-2020-0787

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

Published: Mar 12, 2020 | Modified: Jul 24, 2024
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
7.2 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

An elevation of privilege vulnerability exists when the Windows Background Intelligent Transfer Service (BITS) improperly handles symbolic links, aka Windows Background Intelligent Transfer Service 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 - (including) - (including)
Windows_10_1607 Microsoft - (including) - (including)
Windows_10_1709 Microsoft - (including) - (including)
Windows_10_1803 Microsoft - (including) - (including)
Windows_10_1809 Microsoft - (including) - (including)
Windows_10_1903 Microsoft - (including) - (including)
Windows_10_1909 Microsoft - (including) - (including)
Windows_7 Microsoft –sp1 (including) –sp1 (including)
Windows_8.1 Microsoft - (including) - (including)
Windows_rt_8.1 Microsoft - (including) - (including)
Windows_server_1803 Microsoft - (including) - (including)
Windows_server_1903 Microsoft - (including) - (including)
Windows_server_1909 Microsoft - (including) - (including)
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 - (including) - (including)
Windows_server_2019 Microsoft - (including) - (including)

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