CVE Vulnerabilities

CVE-2019-1064

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

Published: Jun 12, 2019 | Modified: May 20, 2025
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
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 Windows AppX Deployment Service (AppXSVC) improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could then install programs; view, change or delete data. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system. The security update addresses the vulnerability by correcting how Windows AppX Deployment Service handles hard links.

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_1607 Microsoft - (including) - (including)
Windows_10_1703 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_server_1709 Microsoft - (including) - (including)
Windows_server_1803 Microsoft - (including) - (including)
Windows_server_1903 Microsoft - (including) - (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