Description
Tunnelblick is an open source graphic user interface for OpenVPN on macOS. In versions 3.3beta26 through 9.0beta01, any local user can read arbitrary root-owned files by exploiting a symlink following vulnerability in tunnelblick-helper, reachable through the world-accessible tunnelblickd Unix socket. The socket is configured with mode 0666, allowing any local user to connect. No authorization check is performed on the connecting client. The tunnelblick-helper process constructs a path to config.ovpn inside a user-controlled .tblk directory and reads it as root without symlink validation. An attacker can create a .tblk configuration with a symlinked config.ovpn pointing to any file and request tunnelblickd to read it. This issue has been fixed in versions 9.0beta02.
Problem types
CWE-61: UNIX Symbolic Link (Symlink) Following
Product status
References
github.com/...lblick/security/advisories/GHSA-927j-vcjf-hq69
github.com/...lblick/security/advisories/GHSA-927j-vcjf-hq69
github.com/Tunnelblick/Tunnelblick/releases/tag/v9.0beta02