CVE-2019-12571 Explained : Impact and Mitigation

A vulnerability in the London Trust Media Private Internet Access (PIA) VPN Client for macOS could allow a local attacker to overwrite arbitrary files, potentially leading to a denial of service scenario and data loss.

Understanding CVE-2019-12571

This CVE identifies a flaw in the PIA VPN Client for macOS that could be exploited by a local attacker with authenticated access.

What is CVE-2019-12571?

The vulnerability in the PIA VPN Client for macOS allows a local attacker to overwrite any file on the system by exploiting the creation and deletion process of a specific XML file during connection initiation.

The Impact of CVE-2019-12571

The exploitation of this vulnerability could result in a denial of service situation and potential data loss if misused by a malicious local user.

Technical Details of CVE-2019-12571

This section provides more detailed technical information about the vulnerability.

Vulnerability Description

The flaw in the PIA VPN Client for macOS allows an attacker to overwrite arbitrary files by manipulating the creation and deletion of the /tmp/pia-watcher.plist file during connection initiation.

Affected Systems and Versions

London Trust Media Private Internet Access (PIA) VPN Client v0.9.8 beta (build 02099) for macOS

Exploitation Mechanism

During connection initiation, the client generates the /tmp/pia-watcher.plist file, overwriting its contents if it already exists
Unauthorized users can create links to arbitrary files, potentially leading to a denial of service and data loss

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the PIA VPN Client to a patched version
Monitor file changes and access permissions on critical system files

Long-Term Security Practices

Implement the principle of least privilege to limit user access
Regularly review and update security configurations and policies

Patching and Updates

Apply patches and updates provided by the vendor to address the vulnerability