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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-352-01) Emerson Rosemount X-STREAM
18 December 2020
AusCERT Security Bulletin Summary
Product: Emerson Rosemount X-STREAM
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-27254
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ICS Advisory (ICSA-20-352-01)
Emerson Rosemount X-STREAM
Original release date: December 17, 2020
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
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1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Emerson
o Equipment: Rosemount X-STREAM Gas Analyzer
o Vulnerability: Improper Authentication
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker through a
specially crafted URL to download files and obtain sensitive information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Emerson's Rosemount X-STREAM gas analysis software,
o X-STREAM enhanced XEGP - all revisions
o X-STREAM enhanced XEGK - all revisions
o X-STREAM enhanced XEFD - all revisions
o X-STREAM enhanced XEXF - all revisions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER AUTHENTICATION CWE-287
The affected products are vulnerable to improper authentication for accessing
log and backup data, which could allow an attacker with a specially crafted URL
to obtain access to sensitive information.
CVE-2020-27254 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: Energy, Chemical
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Maxim Rupp reported this vulnerability to CISA.
Emerson recommends users update the firmware of any affected products. A new
release that addresses the issues identified in this Cybersecurity Notification
impacting the affected products is available. For information on how to obtain
the update contact TechSupport.Hasselroth@emerson.com
In addition, Emerson recommends users of affected products continue to utilize
current cybersecurity industry best practices. In the event such infrastructure
is not implemented within an end user's network, action should be taken to
ensure the affected products are connected to a well-protected network and
properly segmented from the Internet. For more information on the Emerson
Security notifications 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.
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.
No known public exploits specifically target this vulnerability.
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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