Microsoft Windows InstallService Directory Junction Denial-of-Service Vulnerability
Vulnerability Details
This vulnerability allows local attackers to create a denial-of-service condition on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the Microsoft Store Install Service. By creating a directory junction, an attacker can abuse the service to delete a file. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.
Additional Details
Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1697
Disclosure Timeline
- 2020-09-30 - Vulnerability reported to vendor
- 2021-01-14 - Coordinated public release of advisory
- 2021-01-21 - Advisory Updated
Credit
JeongOh Kyea (@kkokkokye) of THEORI
