Advisory Details

February 24th, 2021

Parallels Desktop Toolgate Out-Of-Bounds Write Privilege Escalation Vulnerability

CVE ID	CVE-2021-27242
CVSS SCORE	8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS	Parallels
AFFECTED PRODUCTS	Desktop
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop. 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 a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the hypervisor.
ADDITIONAL DETAILS	Parallels has issued an update to correct this vulnerability. More details can be found at: https://kb.parallels.com/en/125013
DISCLOSURE TIMELINE	2020-09-30 - Vulnerability reported to vendor 2021-02-24 - Coordinated public release of advisory 2022-09-26 - Advisory Updated
CREDIT	Ezrak1e

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