CVE-2021-27278 : Security Advisory and Response

This vulnerability affects Parallels Desktop version 16.1.1-49141, allowing local attackers to escalate privileges by exploiting a flaw in the Toolgate component. Attackers with high-privileged code execution capabilities on the target guest system can leverage this issue to escalate privileges on the host system.

Understanding CVE-2021-27278

CVE-2021-27278 pertains to a privilege escalation vulnerability in Parallels Desktop version 16.1.1-49141.

What is CVE-2021-27278?

CVE-2021-27278 allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.1.1-49141. The vulnerability arises due to improper validation of a user-supplied path in the Toolgate component.

The Impact of CVE-2021-27278

The vulnerability has a CVSS base score of 8.2 (High severity) with high impacts on confidentiality, integrity, and availability. Attackers can execute code in the host system's context.

Technical Details of CVE-2021-27278

This section will delve into the specifics of the vulnerability.

Vulnerability Description

The flaw in Parallels Desktop version 16.1.1-49141 stems from inadequate validation of user-supplied paths before engaging in file operations.

Affected Systems and Versions

Version 16.1.1-49141 of Parallels Desktop is affected by this vulnerability.

Exploitation Mechanism

Attackers need high-privileged code execution on the guest system to exploit this vulnerability.

Mitigation and Prevention

To safeguard systems from CVE-2021-27278, consider the following steps:

Immediate Steps to Take

Update Parallels Desktop to a patched version.
Implement least privilege access controls.

Long-Term Security Practices

Regularly monitor and patch software vulnerabilities.
Conduct security training to educate users on safe computing practices.

Patching and Updates

Update Parallels Desktop to the latest version to mitigate the risk of privilege escalation.