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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-308-03) ARC Informatique PcVue
6 January 2021
AusCERT Security Bulletin Summary
Product: ARC Informatique PcVue
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-26869 CVE-2020-26868 CVE-2020-26867
Revision History: January 6 2021: Additional upgrade instructions added to advisory
November 4 2020: Initial Release
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ICS Advisory (ICSA-20-308-03)
ARC Informatique PcVue (Update A)
Original release date: January 05, 2021
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,
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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 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: ARC Informatique
o Equipment: PcVue
o Vulnerabilities: Deserialization of Untrusted Data, Access to Critical
Private Variable via Public Method, Information Exposure of Sensitive
Information to an Unauthorized Actor
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-20-308-03 ARC Informatique PcVue that was published November 3, 2020, on
the ICS webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
execute arbitrary code, expose sensitive data, and prevent legitimate users
from connecting to PcVue services.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following versions of PcVue are affected:
o PcVue Versions 8.10 to versions prior to 12.0.17
4.2 VULNERABILITY OVERVIEW
4.2.1 DESERIALIZATION OF UNTRUSTED DATA CWE-502
The affected product is vulnerable due to the deserialization of untrusted
data, which may allow an attacker to remotely execute arbitrary code on the web
and mobile back-end server.
CVE-2020-26867 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
4.2.2 ACCESS TO CRITICAL PRIVATE VARIABLE VIA PUBLIC METHOD CWE-767
The affected product is vulnerable to a denial-of-service attack due to the
ability of an unauthorized user to modify information used to validate messages
sent by legitimate web clients. This issue also affects third-party systems
based on the Web Services Toolkit.
CVE-2020-26868 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
4.2.3 INFORMATION EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR
The affected product is vulnerable to information exposure, allowing
unauthorized users to access session data of legitimate users. This issue also
affects third-party systems based on the Web Services Toolkit.
CVE-2020-26869 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
Sergey Temnikov and Andrey Muravitsky of Kaspersky Lab reported these
vulnerabilities to ARC Informatique.
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ARC Informatique recommends upgrading PcVue to v12.0.17. Contact PcVue Support
to receive instructions on downloading and installing the latest software
Patches are available for Version 12 (12.0.17 Maintenance Release) and Version
11.2 (11.2.06097 Update).
The following mitigations and workarounds have been identified by ARC
Informatique to help reduce risk:
o Uninstall the web and mobile backend. Users not using the affected
components should uninstall them. If the components are not required, do
not install them.
o Harden firewall configuration by ensuring that incoming connections on the
corresponding port are authorized only if initiated by the IIS Web Server
process. The listening port is configurable (default 8090) and may have
been changed on the system using the Application Explorer.
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For more information on this issue, please see Security Bulletin 2020-1 on the
ARC Informatique security page .
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 that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that 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
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 these vulnerabilities.
For any questions related to this report, please contact the CISA at:
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.
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