1. EXECUTIVE SUMMARY
- CVSS v3 5.9
- ATTENTION: Exploitable remotely/public exploits are available
- Vendor: Dingtian
- Equipment: DT-R002
- Vulnerability: Authentication Bypass by Capture-Replay
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to bypass authentication.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Dingtian DT-R002, a relay board, are affected:
- DT-R002: version 3.1.276A
3.2 Vulnerability Overview
relay_cgi.cgi on Dingtian DT-R002 2CH relay devices with firmware 3.1.276A allows an attacker to replay HTTP post requests without the need for authentication or a valid signed/authorized request.
- CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
- COUNTRIES/AREAS DEPLOYED: Unknown
- COMPANY HEADQUARTERS LOCATION: China
CISA discovered a public Proof of Concept (PoC) as authored by Victor Hanna of Trustwave SpiderLabs.
Dingtian has not responded to requests to work with CISA to mitigate this vulnerability. Users of affected versions of Dingtian DT-R002 are invited to contact Dingtian customer support for additional information.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
- Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
- Locate control system networks and remote devices behind firewalls and isolating them from business networks.
- When remote access is required, use more 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 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 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.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
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 attachments in unsolicited 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.
This vulnerability has a high attack complexity.