Overview
In the dynamic field of cybersecurity, it’s crucial to keep up to speed with the latest vulnerabilities that could pose a threat to your system’s integrity. This blog post focuses on a recently disclosed vulnerability, CVE-2024-36486, identified in Parallels Desktop for Mac version 20.1.1. This vulnerability is of significant concern due to its potential to escalate privileges, leading to system compromise or data leakage. Parallels Desktop is a popular choice for running Windows on Mac, which makes this vulnerability relevant to a wide range of users, both individual and corporate.
Vulnerability Summary
CVE ID: CVE-2024-36486
Severity: High (CVSS: 7.8)
Attack Vector: Local
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Parallels Desktop for Mac | Version 20.1.1 (55740)
How the Exploit Works
The exploit takes advantage of a privilege escalation vulnerability that occurs during the restoration of a virtual machine archive in Parallels Desktop. Specifically, the prl_vmarchiver tool, which is used to decompress the file and write the content back to its original location, does so using root privileges. An attacker can exploit this process by creating a hard link to write to any file of their choosing. By directing the decompression operation to a different location, an attacker can potentially gain escalated privileges within the system.
Conceptual Example Code
Here’s a simplified example of how an attacker might exploit the vulnerability:
# Attacker creates a hard link to a sensitive file
ln /path/to/sensitive/file /path/to/restore/location
# Attacker initiates the VM restoration process
prl_vmarchiver restore /path/to/restore/locationIn this example, `prl_vmarchiver` would restore the VM archive content to `/path/to/restore/location`, but due to the hard link, also overwrite the sensitive file at `/path/to/sensitive/file` with the same content, potentially granting the attacker escalated privileges.
Mitigation and Prevention
It’s recommended to apply the vendor patch as soon as it’s available to fix this vulnerability. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. Regularly updating software, monitoring system logs, and limiting user privileges can help prevent future exploitation of similar vulnerabilities.