CVE-2019-12577 : Vulnerability Insights and Analysis

London Trust Media Private Internet Access (PIA) VPN Client v82 for macOS has a vulnerability that allows a local attacker to execute arbitrary code with elevated privileges.

Understanding CVE-2019-12577

This CVE involves a privilege escalation vulnerability in the PIA VPN Client for macOS, enabling a local attacker to run code with elevated privileges.

What is CVE-2019-12577?

The vulnerability in the PIA VPN Client for macOS v82 allows a local attacker to manipulate file permissions during the connection process, executing code as the root user.

The Impact of CVE-2019-12577

The vulnerability permits a local attacker with limited privileges to execute arbitrary code as the root user, compromising system security.

Technical Details of CVE-2019-12577

The technical aspects of the CVE-2019-12577 vulnerability are as follows:

Vulnerability Description

The macOS binary openvpn_launcher.64, when executed, creates /tmp/pia_upscript.sh with root privileges.
Due to a umask issue, the file creation mask is not reset, allowing manipulation of file permissions.

Affected Systems and Versions

Product: London Trust Media Private Internet Access (PIA) VPN Client
Version: v82

Exploitation Mechanism

Local attacker manipulates umask value during connection process to modify /tmp/pia_upscript.sh and execute code as root.

Mitigation and Prevention

To address CVE-2019-12577, follow these steps:

Immediate Steps to Take

Update the PIA VPN Client to a patched version.
Monitor system for any unauthorized changes or activities.

Long-Term Security Practices

Regularly review and update system permissions and configurations.
Implement least privilege access controls to limit potential attack surfaces.

Patching and Updates

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