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 3. Cybersecurity Advisories
 4. ICS Advisory

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ICS Advisory


ROCKWELL AUTOMATION MICROLOGIX 1400 AND COMPACTLOGIX 5370 CONTROLLERS

Last Revised
April 23, 2019
Alert Code
ICSA-19-113-01



1. EXECUTIVE SUMMARY

 * CVSS v3 7.1
 * ATTENTION: Exploitable remotely/low skill level to exploit
 * Vendor: Rockwell Automation
 * Equipment: MicroLogix 1400 and CompactLogix 5370 Controllers
 * Vulnerability: Open Redirect


2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a remote
unauthenticated attacker to input a malicious link redirecting users to a
malicious website.


3. TECHNICAL DETAILS


3.1 AFFECTED PRODUCTS

The following Rockwell Automation products are affected:

 * MicroLogix 1400 Controllers
   * Series A, All Versions
   * Series B, v15.002 and earlier
 * MicroLogix 1100 Controllers v14.00 and earlier
 * CompactLogix 5370 L1 controllers v30.014 and earlier
 * CompactLogix 5370 L2 controllers v30.014 and earlier
 * CompactLogix 5370 L3 controllers (includes CompactLogix GuardLogix
   controllers) v30.014 and earlier


3.2 VULNERABILITY OVERVIEW


3.2.1    URL REDIRECTION TO UNTRUSTED SITE ('OPEN REDIRECT') CWE-601(LINK IS
EXTERNAL)

An open redirect vulnerability could allow a remote unauthenticated attacker to
input a malicious link to redirect users to a malicious site that could run or
download arbitrary malware on the user’s machine.

CVE-2019-10955 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L(link is external)).


3.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
 * COUNTRIES/AREAS DEPLOYED: Worldwide
 * COMPANY HEADQUARTERS LOCATION: United States


3.4 RESEARCHER

Josiah Bryan and Geancarlo Palavicini reported this vulnerability to NCCIC.


4. MITIGATIONS

Rockwell Automation has released a security advisory with mitigation steps that
can be found at:

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1086288(link is
external) (Login required)

Rockwell Automation recommends users take defensive measures to minimize the
risk of exploitation of this vulnerability. Specifically, users should:

 * Update to the latest available firmware revision that addresses the
   associated risk.
 * Use trusted software, software patches, anti-virus/anti-malware programs, and
   interact only with trusted websites and attachments.
 * Minimize network exposure for all control system devices and/or systems, and
   ensure that they are not accessible from the Internet.
 * Locate control system networks and devices behind firewalls and isolate them
   from the business network.
 * 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. VPN is only as secure as the
   connected devices.
 * Employ training and awareness programs to educate users on the warning signs
   of a phishing or social engineering attack.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended practices
on the ICS-CERT web page. 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-CERT website 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 NCCIC
for tracking and correlation against other incidents.

NCCIC also recommends that users take the following measures to protect
themselves from social engineering attacks:

 * Do not click web links or open unsolicited attachments in email messages.
 * Refer to Recognizing and Avoiding Email Scams for more information on
   avoiding email scams.
 * Refer to Avoiding Social Engineering and Phishing Attacks for more
   information on social engineering attacks.

No known public exploits specifically target this vulnerability.


VENDOR

Rockwell Automation


PLEASE SHARE YOUR THOUGHTS

We recently updated our anonymous product survey; we’d welcome your feedback.


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