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                             CERT-Renater

                 Note d'Information No. 2021/VULN036
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DATE                : 21/01/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S):  Systems running Veritas Backup Exec versions prior
             to 21.1 Hotfix 657517 (Engineering version 21.0.1200.1217),
                20.6 Hotfix 298543 (Engineering version 20.0.1188.2734).

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https://kb.cert.org/vuls/id/429301
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Veritas Backup Exec is vulnerable to privilege escalation due to
OPENSSLDIR location


Vulnerability Note VU#429301

Original Release Date: 2020-12-23 | Last Revised: 2021-01-06


Overview

Veritas Backup Exec 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-2019-1552

Veritas Backup Exec includes an OpenSSL component that specifies an
OPENSSLDIR variable as /usr/local/ssl/. On the Windows platform, this
path is interpreted as C:\usr\local\ssl. Backup Exec 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:\usr\local\ssl
directory, an unprivileged user may be able to execute arbitrary code
with SYSTEM privileges on a Windows system with the vulnerable Veritas
software installed.


Solution

Apply an update


This vulnerability is addressed in Backup Exec 21.1 Hotfix 657517
(Engineering version 21.0.1200.1217) and Backup Exec 20.6 Hotfix 298543
(Engineering version 20.0.1188.2734).
Create a C:\usr\local\ssl directory

In cases where an update cannot be installed, this vulnerability can be
mitigated by creating a C:\usr\local\ssl directory and restricting ACLs
to prevent unprivileged users from being able to write to this location.


Acknowledgements

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

This document was written by Will Dormann.


Vendor Information

Veritas Technologies    Affected
Notified:               2020-11-11 Updated: 2020-12-23

CVE-2020-36167	Affected


Vendor Statement

We have not received a statement from the vendor.


References

    https://www.veritas.com/content/support/en_US/security/VTS20-010
    https://www.veritas.com/content/support/en_US/downloads/update.UPD657517
    https://www.veritas.com/content/support/en_US/downloads/update.UPD298543


References

    https://www.veritas.com/content/support/en_US/security/VTS20-010
    https://www.veritas.com/content/support/en_US/downloads/update.UPD657517
    https://www.veritas.com/content/support/en_US/downloads/update.UPD298543


Other Information

CVE IDs:                CVE-2020-36167
Date Public:            2020-12-23
Date First Published:   2020-12-23
Date Last Updated:      2021-01-06 18:37 UTC
Document Revision:      3


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