Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company. Arthur Schopenhauer

In the previous post, we talked about how Avast Free Antivirus “awkwardly” removes malware and how an attacker, by chaining CVE-2023-1585 and CVE-2023-1587, was able to execute arbitrary code in the SYSTEM context. And it is quite obvious to assume that similar problems can be in the virus restore functionality. And today I’m sharing the report describing the vulnerability (CVE-2023-1586) in Avast file restore functionality and exploitation of this vulnerability to execute arbitrary code in the NT AUTHORITY\SYSTEM context. Avast Anti-Virus privileged arbitrary file create on virus restore