Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.0710
(icsa-21-056-01) PerFact OpenVPN-Client
26 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: PerFact OpenVPN-Client
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27406
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-056-01
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-21-056-01)
PerFact OpenVPN-Client
Original release date: February 25, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: PerFact
o Equipment: OpenVPN-Client
o Vulnerability: External Control of System or Configuration Setting
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow for local privilege
escalation or remote code execution through a malicious webpage.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of OpenVPN-Client are affected:
o OpenVPN-Client, Versions 1.4.1.0 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 EXTERNAL CONTROL OF SYSTEM OR CONFIGURATION SETTING CWE-15
An attacker can take leverage on this architecture and send the config command
from any application running on the local host machine to force the back-end
server into initializing a new open-VPN instance with arbitrary open-VPN
configuration. This could result in the attacker achieving execution with
privileges of a SYSTEM user.
CVE-2021-27406 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Sharon Brizinov of Claroty reported this vulnerability to CISA.
4. MITIGATIONS
PerFact has released Version 1.6.0, which mitigates this vulnerability.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=KqUf
-----END PGP SIGNATURE-----