PT-2021-20704 · Parallels · Parallels Desktop

Published 2021-08-03 · Updated 2021-10-27 · CVE-2021-34857

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:L/AC:L/PR:L/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 result in a write past the end of an allocated buffer. 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

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-34857

ZDI-21-940

Affected Products

Parallels Desktop

References · 6

• https://zerodayinitiative.com/advisories/ZDI-21-940 · Security Note
• https://kb.parallels.com/125013 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34857 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34857 · Vendor Advisory
• https://t.me/cvenotify/22348 · Telegram Post
• https://t.me/cibsecurity/31165 · Telegram Post