PT-2021-20711 · Parallels · Parallels Desktop

Reno Robert · Published 2021-09-08 · Updated 2022-01-31 · CVE-2021-34867

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Parallels Desktop version 16.1.3-49160

Description: This issue allows local attackers to escalate privileges on affected installations. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this issue. The specific flaw exists within the Toolgate component, resulting from the lack of proper validation of user-supplied data, which can lead to an uncontrolled memory allocation. An attacker can leverage this issue to escalate privileges and execute arbitrary code in the context of the hypervisor.

Recommendations: For Parallels Desktop version 16.1.3-49160, consider disabling the Toolgate component as a temporary workaround until a patch is available. Restrict access to the Toolgate component to minimize the risk of exploitation. Avoid using user-supplied data in the affected component until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this issue.

Fix

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2021-34867

ZDI-21-1055

Affected Products

Parallels Desktop

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-34867 · Security Note
• https://kb.parallels.com/125013 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34867 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-21-1055 · Security Note
• https://t.me/cibsecurity/36228 · Telegram Post