In Avast Antivirus before 19.4, a local administrator can trick the product into renaming arbitrary files by replacing the Logs\Update.log file with a symlink. The next time the product attempts to write to the log file, the target of the symlink is renamed. This defect can be exploited to rename a critical product file (e.g., AvastSvc.exe), causing the product to fail to start on the next system restart.
CVSS Details
- CVSS 3.0 Base Score: 4.4
- CVSS 3.0 Vector: (CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N)
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