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AUSCERT External Security Bulletin Redistribution
ESB-2019.4725
Advisory (icsa-19-353-04) Reliable Controls MACH-ProWebCom/Sys
20 December 2019
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AusCERT Security Bulletin Summary
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Product: MACH-ProWebSys
MACH-ProWebCom
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18249
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-19-353-04
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ICS Advisory (ICSA-19-353-04)
Reliable Controls MACH-ProWebCom/Sys
Original release date: December 19, 2019
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.2
o ATTENTION: Exploitable remotely
o Vendor: Reliable Controls
o Equipment: MACH-ProWebCom/Sys
o Vulnerability: Cross-site Scripting
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
execute commands on behalf of the affected user.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of MACH ProWebCom/Sys, a web enabled building
controller, are affected:
o MACH-ProWebSys: All versions prior to 2.15 (Firmware versions prior to
8.26.4)
o MACH-ProWebCom: All versions prior to 2.15 (Firmware versions prior to
8.26.4)
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
An authenticated user clicking on a malicious link may allow an attacker to
execute commands on behalf of the affected user.
CVE-2019-18249 has been assigned to this vulnerability. A CVSS v3 base score of
8.2 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:C/
C:H/I:H/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Canada
3.4 RESEARCHER
Gjoko Krstic of Applied Risk reported this vulnerability to CISA.
4. MITIGATIONS
Reliable Controls has released MACH-ProWebCom/Sys firmware revision 8.26.4 and
software revision 2.15 to resolve the vulnerability. The updated software can
be obtained at the following link: MACH-ProWebCom/Sys firmware revision 8.26.4
(login required).
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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.
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.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.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
No known public exploits specifically target this vulnerability. High skill
level is needed to exploit.
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