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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-19-353-04) Reliable Controls MACH-ProWebCom/Sys
20 December 2019
AusCERT Security Bulletin Summary
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2019-18249
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ICS Advisory (ICSA-19-353-04)
Reliable Controls MACH-ProWebCom/Sys
Original release date: December 19, 2019
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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
o MACH-ProWebCom: All versions prior to 2.15 (Firmware versions prior to
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
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/
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Canada
Gjoko Krstic of Applied Risk reported this vulnerability to CISA.
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
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
No known public exploits specifically target this vulnerability. High skill
level is needed to exploit.
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