(0Day) Avast Cleanup Premium 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 file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Additional Details
02/28/24 – ZDI reported the vulnerability to Avast’s Security Reports team.
09/27/23 – ZDI asked for updates.
06/19/24 –ZDI asked for updates.
07/26/24 - ZDI informed the vendor that since we have not received a response, we will publish the case as a zero-day advisory on 07/29/24
-- Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the application.
Disclosure Timeline
- 2024-02-28 - Vulnerability reported to vendor
- 2024-07-29 - Coordinated public release of advisory
- 2024-08-15 - Advisory Updated
Credit
Anonymous
