CVE-2020-15590

Name of the Vulnerable Software and Affected Versions Private Internet Access (PIA) VPN Client for Linux versions 1.5 through 2.3

Description A vulnerability in the Private Internet Access (PIA) VPN Client for Linux allows remote attackers to bypass an intended VPN kill switch mechanism and read sensitive information via intercepting network traffic. This occurs when the kill switch is configured to block all inbound and outbound network traffic, but privileged applications can continue sending and receiving network traffic if net.ipv4.ip forward has been enabled in the system kernel parameters. For instance, a Docker container running on a host with the VPN turned off and the kill switch turned on can continue using the internet, potentially leaking the host IP.

Recommendations For Private Internet Access (PIA) VPN Client for Linux versions 1.5 through 2.3, consider updating to version 2.4.0 or later, which enables policy-based routing by default to direct all forwarded packets to the VPN interface automatically. As a temporary workaround, consider disabling the net.ipv4.ip forward option in the system kernel parameters to prevent privileged applications from bypassing the kill switch mechanism.