CVE-2021-34867 Memory corruption in Desktop

High 7.5 Published 25 Jan 2022 Updated 4 Aug 2024

Local attackers with guest code execution can escalate privileges to the hypervisor via uncontrolled memory allocation in Parallels Desktop.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-34867?

CVE-2021-34867 is a high-severity memory corruption vulnerability in Parallels Desktop, published on 25 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.1.3-49160. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the Toolgate component. The issue results from the lack of proper validation of user-supplied data, which can result in an uncontrolled memory allocation. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13672.

Weakness: CWE-789

Which versions are affected by CVE-2021-34867?

It affects 1 product.

Products include Parallels Parallels.

How do I fix CVE-2021-34867?

No fix has been published for CVE-2021-34867 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-34867 being exploited?

There is no known exploitation of CVE-2021-34867 in the wild and no public exploit code.

Sources

Also known as GHSA-8vvh-6wqm-9fpw.