CVE-2026-31893: Tunnelblick, обхождане на път

Описание

Оригинално описание

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.

Засегнати продукти

• Tunnelblick Tunnelblick: >= 3.3beta26, < 9.0beta02

Вид слабост

• CWE-61 Проследяване на символна връзка в UNIX (Symlink Following)

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-31893
• https://nvd.nist.gov/vuln/detail/CVE-2026-31893
• https://github.com/Tunnelblick/Tunnelblick/security/advisories/GHSA-927j-vcjf-hq69
• https://github.com/Tunnelblick/Tunnelblick/releases/tag/v9.0beta02