CVE-2019-12578 : Security Advisory and Response
Learn about CVE-2019-12578 affecting London Trust Media Private Internet Access (PIA) VPN Client v82 for Linux. Find out how an attacker can execute unauthorized code with elevated privileges and steps to prevent exploitation.
London Trust Media Private Internet Access (PIA) VPN Client v82 for Linux is vulnerable to an exploit that allows an authenticated local attacker to execute unauthorized code with elevated privileges.
Understanding CVE-2019-12578
An overview of the vulnerability in the PIA VPN Client v82 for Linux.
What is CVE-2019-12578?
- The vulnerability in the PIA VPN Client v82 for Linux enables a local attacker to run arbitrary code with elevated privileges by exploiting the openvpn_launcher.64 binary.
- The issue lies in the --route-pre-down parameter, which can execute a script or program specified by a path when OpenVPN terminates.
The Impact of CVE-2019-12578
- An attacker with local access can escalate privileges and execute malicious code as root, compromising the system's security.
Technical Details of CVE-2019-12578
Insight into the technical aspects of the vulnerability.
Vulnerability Description
- The setuid root binary, openvpn_launcher.64, executes /opt/pia/openvpn-64/openvpn with command line parameters, including the vulnerable --route-pre-down parameter.
Affected Systems and Versions
- London Trust Media Private Internet Access (PIA) VPN Client v82 for Linux is affected.
Exploitation Mechanism
- By leveraging the --route-pre-down parameter, an unauthorized local user can execute a malicious script or binary as root when OpenVPN stops.
Mitigation and Prevention
Preventive measures and actions to mitigate the CVE-2019-12578 vulnerability.
Immediate Steps to Take
- Disable the vulnerable --route-pre-down parameter and ensure that the --script-security parameter is not enabled.
- Regularly monitor and restrict access to the affected system to prevent unauthorized exploitation.
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access and limit the impact of potential attacks.
- Conduct regular security audits and updates to address vulnerabilities promptly.
Patching and Updates
- Apply patches and updates provided by the vendor to fix the vulnerability and enhance system security.