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1. EXECUTIVE SUMMARY
- CVSS v3 6.5
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: LS Electric, LS Industrial Systems (LSIS) Co. Ltd
- Equipment: LS ELEC PLC and XG5000
- Vulnerability: Inadequate Encryption Strength
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to decrypt credentials and gain full access to the affected programmable logic controller (PLC).
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of LS ELECTRIC PLC, a PLC, and XG5000, a PLC programming software, are affected:
- LS Electric PLC: All versions
- XG5000: All versions
3.2 VULNERABILITY OVERVIEW
Passwords are not adequately encrypted during the communication process between the XG5000 software and the affected PLC. This could allow an attacker to identify and decrypt the affected PLC’s password by sniffing the traffic.
- CRITICAL INFRASTRUCTURE SECTORS: Multiple
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: South Korea
Hong-Gi Kin of the Korea Internet & Security Agency (KISA) reported this vulnerability to CISA.
LS Electric is aware of the vulnerability and is developing mitigations. Users of these affected products are recommended to contact LS Electric for additional information.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls and isolate them from business networks.
- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its 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 at cisa.gov/ics. Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report 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.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
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