Software Engineering Institute

Overview

Tychon contains a privilege escalation vulnerability due to the use of an OPENSSLDIR variable that specifies a location where an unprivileged Windows user may be able to place files.

Description

Tychon includes an OpenSSL component that specifies an OPENSSLDIR variable as a subdirectory that my be controllable by an unprivileged user on Windows. Tychon contains a privileged service that uses this OpenSSL component. A user who can place a specially-crafted openssl.cnf file at an appropriate path may be able to achieve arbitrary code execution with SYSTEM privileges.

Impact

By placing a specially-crafted openssl.cnf in a location used by Tychon, an unprivileged user may be able to execute arbitrary code with SYSTEM privileges on a Windows system with the vulnerable Tychon software installed.

Solution

Apply an update

This issue is addressed in Tychon 1.7.857.82

Acknowledgements

This document was written by Will Dormann.

Vendor Information