Avast Premium Security AvastSvc Directory Junction Denial-of-Service Vulnerability
February 24th, 2021
Vulnerability Details
This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security. 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 AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.
Additional Details
Fixed in Avast v20.10
Disclosure Timeline
- 2020-11-18 - Vulnerability reported to vendor
- 2021-02-24 - Coordinated public release of advisory
Credit
Abdelhamid Naceri
