Software Engineering Institute

Macrium Reflect is vulnerable to privilege escalation due to OPENSSLDIR location

Vulnerability Note VU#760767

Original Release Date: 2020-10-26 | Last Revised: 2020-11-11

Overview

Macrium Reflect contains a privilege escalation vulnerability due to the use of an OPENSSLDIR variable that specifies a location where an unprivileged Windows user can create files.

Description

CVE-2020-10143

Macrium Reflect includes an OpenSSL component that specifies an OPENSSLDIR variable as C:\openssl\. Macrium Reflect contains a privileged service that uses this OpenSSL component. Because unprivileged Windows users can create subdirectories off of the system root, a user can create the appropriate path to a specially-crafted openssl.cnf file to achieve arbitrary code execution with SYSTEM privileges.

Impact

By placing a specially-crafted openssl.cnf in the C:\openssl\ directory, an unprivileged user may be able to execute arbitrary code with SYSTEM privileges on a Windows system with the vulnerable Macrium software installed.

Solution

Apply an update

This vulnerability is addressed in Macrium Reflect v7.3.5281.

Acknowledgements

This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

760767

Macrium Affected

Notified:  2020-09-23 Updated: 2020-11-11

Statement Date:   November 11, 2020

 CVE-2020-10143 Affected

Vendor Statement

This vulnerability was introduced in the Macrium Reflect 7.2 series of releases, Reflect 6, 7.0 and 7.1 are not affected. All users of affected releases are entitled to a free upgrade to 7.3.5281 or later. We would like to thank to Will Dormann (@wdormann) for his diligence in reporting this to us.

Other Information

 CVE IDs: CVE-2020-10143 Date Public: 2020-10-26 Date First Published: 2020-10-26 Date Last Updated: 2020-11-11 13:44 UTC Document Revision: 4