CVE-2019-12579 : Exploit Details and Defense Strategies

An authenticated attacker with local access has discovered a vulnerability in the London Trust Media Private Internet Access (PIA) VPN Client v82 for Linux and macOS, potentially allowing unauthorized code execution with elevated privileges.

Understanding CVE-2019-12579

What is CVE-2019-12579?

This CVE identifies a vulnerability in the PIA VPN Client v82 for Linux and macOS that could enable a local attacker to execute arbitrary code with higher privileges.

The Impact of CVE-2019-12579

The vulnerability allows a local user with low privileges to inject arbitrary commands using shell metacharacters, potentially leading to unauthorized code execution with elevated privileges.

Technical Details of CVE-2019-12579

Vulnerability Description

The PIA Linux/macOS binary openvpn_launcher.64, which has root privileges, accepts parameters for system configuration updates. These parameters are not properly validated, allowing for arbitrary command injection.

Affected Systems and Versions

London Trust Media Private Internet Access (PIA) VPN Client v82 for Linux and macOS

Exploitation Mechanism

Local unprivileged users can provide custom parameters that will be executed by the operating system commands.

Mitigation and Prevention

Immediate Steps to Take

Update the PIA VPN Client to a patched version.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access.
Regularly audit and review system configurations for vulnerabilities.

Patching and Updates

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