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[VS-2018-004] PrivateVPN for MacOS Root Privilege Escalation Vulnerability | Arbitrary File Write

CVE ID

CVE-2018-7311

CVSS Score

Vendor

PrivateVPN

Product

PrivateVPN for MacOS < 2.0.31

Vulnerability Details

PrivateVPN for MacOS suffers from a root privilege escalation vulnerability. The software installs a privileged helper tool that runs as the root user. This privileged helper tool is installed as a LaunchDaemon and implements an XPC service. The XPC service is responsible for handling new VPN connection operations via the main PrivateVPN application. The privileged helper tool creates new VPN connections by executing the openvpn binary located in the /Applications/PrivateVPN.app/Contents/Resources directory. The openvpn binary can be overwritten by the default user, which allows an attacker that has already installed malicious software as the default user to replace the binary. When a new VPN connection is established, the privileged helper tool will launch this malicious binary, thus allowing an attacker to execute code as the root user.

Vendor Response

PrivateVPN confirmed update.

Disclosure Timeline

  • 02-20-2018 - Vendor contacted via Twitter
  • 02-20-2018 - Vendor contacted via Facebook
  • 02-20-2018 - Vendor contacted via email
  • 02-20-2018 - Vendor response and disclosure
  • 02-21-2018 - Vendor response
  • 02-21-2018 - Vendor notified of advisory release

Credit

Benjamin Watson of VerSprite Security