The VPN service in AVAST SecureLine before 5.6.4982.470 allows local users to write to arbitrary files via an Object Manager symbolic link from the log directory (which has weak permissions).
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25289
Reference (s):
- http://zeifan.my/security/arbitrary%20file/eop/2020/07/21/avast-secureline-vpn-arb-file-eop.html