Vulnerability · Published May 3, 2024 · Assigned by zdi

CVE-2023-42125Avast Premium Security Sandbox Protection Link Following Privilege Escalation Vulnerability

High 7.8

In plain English

A high-severity security flaw in Premium Security from Avast. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.0)7.8High

Exploit odds (30 days)0.4%top 64.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Avast Premium Security Sandbox Protection Link Following Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Avast Premium Security. 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 implementation of the sandbox feature. By creating a symbolic link, an attacker can abuse the service to create arbitrary namespace objects. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. . Was ZDI-CAN-20383.

Affected products (as reported)

Vendor	Product	Versions
Avast	Premium Security	Avast Premium Security 22.12.6044 (build 22.12.7758.769)

Weakness: CWE-706 · Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

ZDI-23-1475 x_research-advisory