CVE-2021-34987 : Vulnerability Insights and Analysis

This CVE-2021-34987 impacts Parallels Desktop version 16.5.1 (49187), allowing local attackers to escalate privileges by exploiting a vulnerability within the HDAudio virtual device. The lack of proper validation of user-supplied data length can lead to arbitrary code execution in the hypervisor context.

Understanding CVE-2021-34987

This section explores the details related to the CVE-2021-34987 vulnerability.

What is CVE-2021-34987?

CVE-2021-34987 is a security flaw in Parallels Desktop 16.5.1 (49187) that enables local attackers to elevate privileges by leveraging a specific issue within the HDAudio virtual device.

The Impact of CVE-2021-34987

The impact of CVE-2021-34987 is significant, with a CVSS base score of 8.2 (High) due to high confidentiality, integrity, and availability impact. Attackers with high privileges can exploit this vulnerability to execute arbitrary code.

Technical Details of CVE-2021-34987

In this section, we delve into the technical aspects of CVE-2021-34987.

Vulnerability Description

The vulnerability arises from the improper validation of user-supplied data length before copying it to a fixed-length buffer, leading to a buffer overflow scenario.

Affected Systems and Versions

Parallels Desktop 16.5.1 (49187) is the specific version impacted by this vulnerability.

Exploitation Mechanism

Attackers must first execute high-privileged code on the target guest system to exploit this vulnerability, allowing them to escalate privileges and execute arbitrary code within the hypervisor context.

Mitigation and Prevention

This section outlines the necessary steps to mitigate and prevent exploitation of CVE-2021-34987.

Immediate Steps to Take

Users should apply patches provided by Parallels and closely monitor for any signs of unauthorized privilege escalation.

Long-Term Security Practices

Implementing least privilege access, regularly updating software, and conducting security audits can enhance long-term security.

Patching and Updates

Regularly check for security updates and apply them promptly to safeguard systems against known vulnerabilities.