What is the severity of CVE-2021-27243?

The severity of CVE-2021-27243 is high.

What is the attack vector for CVE-2021-27243?

The attack vector for CVE-2021-27243 requires the attacker to have the ability to execute low-privileged code on the target guest system.

What is the specific flaw in CVE-2021-27243?

The specific flaw in CVE-2021-27243 exists within the Parallels Desktop toolgate and involves an integer overflow.

How can I fix CVE-2021-27243?

To fix CVE-2021-27243, users should update their Parallels Desktop installation to version 16.0.1 or later.

Vulnerability/
CVE-2021-27243

high

8.8

CWE

190

29/3/2021

3/8/2024

CVE-2021-27243: Parallels Desktop Toolgate Integer Overflow Privilege Escalation Vulnerability

First published: Mon Mar 29 2021(Updated: )

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.0.1-48919. An attacker must first obtain the ability to execute low-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 integer overflow before allocating a buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-11924.

Credit: zdi-disclosures@trendmicro.com

Affected Software	Affected Version	How to fix
Parallels Desktop	=16.0.1

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Frequently Asked Questions

What is the severity of CVE-2021-27243?
The severity of CVE-2021-27243 is high.
How does the Parallels Desktop Toolgate Integer Overflow Privilege Escalation Vulnerability affect Parallels Desktop?
The Parallels Desktop Toolgate Integer Overflow Privilege Escalation Vulnerability affects Parallels Desktop 16.0.1-48919.
What is the attack vector for CVE-2021-27243?
The attack vector for CVE-2021-27243 requires the attacker to have the ability to execute low-privileged code on the target guest system.
What is the specific flaw in CVE-2021-27243?
The specific flaw in CVE-2021-27243 exists within the Parallels Desktop toolgate and involves an integer overflow.
How can I fix CVE-2021-27243?
To fix CVE-2021-27243, users should update their Parallels Desktop installation to version 16.0.1 or later.

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collector/zdi-advisory
source/ZDI
alias/ZDI-21-210
alias/ZDI-CAN-11924
alias/CVE-2021-27243
agent/software-canonical-lookup
vendor/parallels
canonical/parallels desktop
version/parallels desktop/16.0.1

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