1. EXECUTIVE SUMMARY
- CVSS v3 3,8
- ATTENTION: Low skill level to exploit
- Vendor: Emerson
- Equipment: OpenEnterprise SCADA Software
- Vulnerability: Inadequate Encryption Strength
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker access to credentials held by OpenEnterprise used for accessing field devices and external systems.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Emerson reports that the vulnerability affects the following products:
- OpenEnterprise All versions through 3.3.5
3.2 VULNERABILITY OVERVIEW
3.2.1 INADEQUATE ENCRYPTION STRENGTH CWE-326
Inadequate encryption may allow the credentials used by OpenEnterprise to access field devices and external systems to be obtained.
CVE-2020-16235 has been assigned to this vulnerability. A CVSS v3 base score of 3.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N).
- CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Healthcare and Public Health, Water and Wastewater Systems
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: United States
Roman Lozko of Kaspersky reported this vulnerability to Emerson.
Emerson recommends all users upgrade to OpenEnterprise 3.3, Service Pack 6 (3.3.6), to resolve this issue. OpenEnterprise Service Packs are available to users with access to the Emerson SupportNet system (login required). Details will be found in the downloads area.
Please send any questions via a SupportNet ticket or by contacting Emerson at US 800-537-9313. For users outside of the United States, please use international toll-free numbers.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- Ensure the least-privilege user principle is followed.
- 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 remote 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. 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.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.
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 also recommends 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. This vulnerability is not exploitable remotely.