Avast Cleanup Premium TuneupSvc Link Following Local Privilege Escalation Vulnerability

Vulnerability Details

This vulnerability allows local attackers to escalate privileges on affected installations of Avast Cleanup Premium. 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 Avast Cleanup Service. By creating a symbolic link, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

Additional Details

Fixed in Avast Cleanup 24.3-SU1 - 24.3.17165.19178

Disclosure Timeline

• 2024-11-05 - Vulnerability reported to vendor
• 2025-07-29 - Coordinated public release of advisory
• 2025-07-29 - Advisory Updated

Credit

Vladislav Berghici

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