CVE-2022-29593 in DT-R002 2CH
Summary
by MITRE • 07/14/2022
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.
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Analysis
by VulDB Data Team • 08/04/2024
The CVE-2022-29593 vulnerability affects Dingtian DT-R002 2CH relay devices running firmware version 3.1.276A and specifically targets the relay_cgi.cgi component. This represents a critical authentication bypass flaw that fundamentally undermines the security model of the device. The vulnerability resides in the HTTP POST request handling mechanism where the system fails to properly validate or authenticate incoming requests before processing them. The device operates under the assumption that legitimate requests can be processed without proper authorization checks, creating a pathway for unauthorized users to manipulate relay states through replay attacks.
The technical implementation of this vulnerability stems from the absence of robust request validation mechanisms within the relay_cgi.cgi script. When an attacker crafts a malicious HTTP POST request containing relay control parameters, the system accepts and executes the command without verifying the sender's credentials or authorization status. This flaw aligns with CWE-346, which addresses the lack of proper validation of a cryptographic signature, as the device essentially accepts any request that appears to be a valid POST operation without proper authentication. The vulnerability exploits the principle of least privilege by allowing arbitrary command execution through replay attacks, where previously captured valid requests can be reused to manipulate device behavior.
From an operational perspective, this vulnerability presents significant risks to industrial control systems and IoT environments where these relay devices are deployed. Attackers can remotely manipulate relay states without requiring legitimate credentials, potentially leading to unauthorized access to connected systems, disruption of critical operations, or even physical security breaches. The impact extends beyond simple relay control as these devices often serve as critical components in building automation, industrial monitoring, or security systems where unauthorized relay manipulation could result in cascading failures or safety hazards. The vulnerability's exploitation requires minimal technical expertise since it leverages existing HTTP protocols rather than requiring complex attack vectors.
The attack surface for this vulnerability is particularly concerning as it enables persistent unauthorized access to relay control functions. An attacker who gains initial access through this vulnerability can repeatedly replay valid requests to maintain control over the device, making it difficult to detect and mitigate. This characteristic aligns with ATT&CK technique T1566, which covers phishing attacks that may lead to initial access, and T1071.004, which addresses application layer protocol usage for command and control. The device's lack of request replay detection mechanisms means that even legitimate users with valid credentials could potentially be exploited if their requests are captured and replayed by malicious actors. Organizations should implement network segmentation and monitoring solutions to detect anomalous request patterns that may indicate replay attacks. Mitigation strategies should include firmware updates from the vendor, network access controls, and deployment of intrusion detection systems specifically configured to monitor for unusual HTTP POST request patterns targeting relay control interfaces. Additionally, implementing proper authentication mechanisms and request validation should be prioritized to prevent unauthorized access to critical relay functions.