Ebyte NE2-D11
A CISA advisory highlights critical vulnerabilities in Ebyte NE2-D11 devices, primarily due to a lack of consistent authentication enforcement and cleartext transmission of sensitive information. The vendor, Ebyte, has not responded to requests for coordination regarding a patch, leaving users vulnerable. These flaws could allow unauthorized access to device configuration, disclosure of sensitive data, and disruption of device operation, impacting critical infrastructure sectors like manufacturing and energy. Users are urged to minimize network exposure and reach out to Ebyte for updates.
The CISA (Cybersecurity and Infrastructure Security Agency) has issued an advisory regarding significant vulnerabilities in Ebyte NE2-D11 devices. These vulnerabilities stem from a failure to consistently enforce authentication before granting administrative access to the device’s web management interface. Specifically, the interface does not adequately protect sensitive communications using transport-layer encryption, leading to a cleartext transmission of sensitive information. An unauthenticated remote attacker could then access configuration information, modify device settings, or disrupt device availability.
Ebyte NE2-D11 devices, manufactured in China, are used in critical infrastructure sectors, including critical manufacturing and energy. The advisory notes that a patch is under development, but Ebyte has not responded to subsequent requests for coordination, leaving users exposed.
Several related vulnerabilities have been identified, including:
- **Lack of Authorization:** The device relies on client-managed authentication tokens without sufficient server-side validation, allowing attackers to replay or manipulate tokens for unauthorized access.
- **Cross-Site Request Forgery (CSRF):** The web management interface does not restrict rendering within external frames, enabling attackers to mislead administrators and initiate unintended changes.
- **Insufficient Protected Credentials:** MQTT credentials and control traffic are transmitted in cleartext, exposing sensitive information to network-level attackers.
- **Rate Limiting and Account Lockout:** The device does not restrict repeated authentication attempts, making it susceptible to automated attacks.
- **Use of GET Request Method with Sensitive Query Strings:** Certain configuration endpoints lack proper server-side authorization checks, potentially allowing unauthorized users to access or modify sensitive device settings.
CISA recommends users take immediate defensive measures, including minimizing network exposure, isolating control systems networks, and utilizing secure remote access methods like VPNs. The agency also encourages organizations to perform impact analysis and risk assessments and report any suspected malicious activity to CISA.