Tychon is vulnerable to privilege escalation due to OPENSSLDIR location

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

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Tychon __ Affected

Notified: 2022-03-10 Updated: 2022-04-28

Statement Date: April 27, 2022

CVE-2022-26872	Affected

Vendor Statement

CVE-2022-26872 has been resolved with an update to the OpenSSL library TYCHON uses. The TYCHON Endpoint version 1.7.857.82 contains the fix to this vulnerability.

Other Information

CVE IDs:	CVE-2022-26872
Date Public:	2022-04-28 Date First Published: