What is CVE-2021-34856?

CVE-2021-34856 is a vulnerability in Parallels Desktop that allows local attackers to escalate privileges on affected installations.

What is the severity of CVE-2021-34856?

CVE-2021-34856 has a severity rating of 8.8 (high).

Which software versions are affected by CVE-2021-34856?

CVE-2021-34856 affects Parallels Desktop 16.1.3 (49160).

How can I fix CVE-2021-34856?

To fix CVE-2021-34856, it is recommended to update to the latest version of Parallels Desktop and apply any available patches or security updates.

Vulnerability/
CVE-2021-34856

high

8.8

CWE

787 119

25/10/2021

24/10/2022

21/10/2023

CVE-2021-34856: (Pwn2Own) Parallels Desktop virtio-gpu Memory Corruption Privilege Escalation Vulnerability

First published: Mon Oct 25 2021(Updated: )

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop. 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 virtio-gpu virtual device. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor.

Credit: zdi-disclosures@trendmicro.com

Affected Software	Affected Version	How to fix
Parallels Desktop
Parallels Desktop	=16.1.3

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Frequently Asked Questions

What is CVE-2021-34856?
CVE-2021-34856 is a vulnerability in Parallels Desktop that allows local attackers to escalate privileges on affected installations.
How can this vulnerability be exploited?
To exploit CVE-2021-34856, an attacker must first obtain the ability to execute high-privileged code on the target guest system.
What is the severity of CVE-2021-34856?
CVE-2021-34856 has a severity rating of 8.8 (high).
Which software versions are affected by CVE-2021-34856?
CVE-2021-34856 affects Parallels Desktop 16.1.3 (49160).
How can I fix CVE-2021-34856?
To fix CVE-2021-34856, it is recommended to update to the latest version of Parallels Desktop and apply any available patches or security updates.

collector/zdi-advisory
alias/ZDI-21-938
alias/ZDI-CAN-13581
alias/CVE-2021-34856
collector/nvd-index
agent/title
agent/weakness
agent/author
agent/severity
agent/references
agent/tags
agent/type
agent/description
agent/event
agent/softwarecombine
agent/first-publish-date
agent/last-modified-date
vendor/parallels
canonical/parallels desktop
version/parallels desktop/16.1.3

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