CVE-2022-29593 is a medium-severity vulnerability affecting the relay_cgi.cgi component on Dingtian DT-R002 2CH relay devices running firmware version 3.1.276A. The vulnerability allows an unauthenticated attacker to replay HTTP POST requests to the device without requiring valid authentication or a signed/authorized request. This means that an attacker can resend previously captured legitimate commands to the device, potentially causing unauthorized control over the relay functions. The vulnerability is classified under CWE-294, which relates to improper authentication mechanisms. The CVSS v3.1 base score is 5.9, reflecting a network attack vector with high attack complexity but no privileges or user interaction required. The impact is primarily on the integrity of the device's operations, as the attacker can manipulate relay states without authorization, but confidentiality and availability are not directly affected. No patches or vendor advisories are currently linked, and there are no known exploits in the wild. The device in question is a specialized relay controller, likely used in industrial or building automation contexts, where relay control is critical for managing electrical circuits or systems remotely.

For European organizations, especially those in industrial automation, building management, or critical infrastructure sectors, this vulnerability poses a risk of unauthorized control over relay devices. Such control could lead to manipulation of electrical circuits, potentially causing operational disruptions, safety hazards, or damage to equipment. While the vulnerability does not directly compromise confidentiality or availability, the integrity breach could result in unauthorized switching operations, leading to process interruptions or unsafe conditions. Organizations relying on Dingtian DT-R002 devices in their operational technology (OT) environments may face increased risk of targeted attacks or accidental misuse if network access is not properly segmented. The lack of authentication requirement lowers the barrier for exploitation, making it feasible for attackers with network access to the device to perform replay attacks. This could be particularly impactful in environments where these devices control critical systems such as HVAC, lighting, or industrial machinery.

To mitigate this vulnerability, European organizations should implement the following specific measures: 1) Network Segmentation: Isolate Dingtian DT-R002 devices on dedicated network segments with strict access controls to limit exposure to untrusted networks or users. 2) Network Monitoring: Deploy intrusion detection systems (IDS) or anomaly detection tools to identify unusual replayed HTTP POST requests targeting relay_cgi.cgi endpoints. 3) Firmware Updates: Engage with the device vendor or supplier to obtain firmware updates or patches addressing this vulnerability; if unavailable, consider alternative devices with stronger authentication mechanisms. 4) Access Controls: Restrict management interfaces to trusted IP addresses and enforce strong authentication at the network perimeter. 5) Replay Attack Prevention: Where possible, implement network-level protections such as TLS with mutual authentication or VPN tunnels to secure communications and prevent interception and replay of commands. 6) Incident Response Planning: Prepare response procedures for unauthorized relay activations, including manual overrides and rapid isolation of affected devices. 7) Device Replacement: For high-risk environments, consider replacing vulnerable devices with models that enforce robust authentication and authorization for control commands.