CVE-2022-30262 in ControlWave
Summary
by MITRE • 08/17/2022
The Emerson ControlWave 'Next Generation' RTUs through 2022-05-02 mishandle firmware integrity. They utilize the BSAP-IP protocol to transmit firmware updates. Firmware updates are supplied as CAB archive files containing a binary firmware image. In all cases, firmware images were found to have no authentication (in the form of firmware signing) and only relied on insecure checksums for regular integrity checks.
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Analysis
by VulDB Data Team • 08/17/2022
The Emerson ControlWave 'Next Generation' RTUs represent critical industrial control systems deployed in operational technology environments where security is paramount for maintaining process integrity and preventing unauthorized access to critical infrastructure. These remote terminal units serve as essential components in industrial automation systems, particularly in sectors such as oil and gas, power generation, and water treatment facilities where continuous operation and system reliability are non-negotiable. The vulnerability identified in these devices stems from a fundamental flaw in their firmware update mechanism that directly compromises the security posture of the entire system. The affected devices through the 2022-05-02 release date demonstrate a critical weakness in their security architecture that allows for potential malicious firmware manipulation without detection.
The technical flaw manifests specifically within the BSAP-IP protocol implementation used for firmware transmission, where the system relies exclusively on insecure checksums for integrity verification rather than implementing proper cryptographic authentication mechanisms. This design decision creates a significant attack surface where adversaries can modify firmware images during transit or even before transmission without the system detecting the tampering. The CAB archive format containing binary firmware images provides no protection against unauthorized modifications, as the system lacks any form of digital signature verification or cryptographic hash validation that would ensure the authenticity and integrity of the firmware being deployed. This vulnerability directly maps to CWE-347, which addresses the lack of proper authentication in security tokens and the absence of cryptographic verification mechanisms in software updates.
The operational impact of this vulnerability extends beyond simple integrity concerns to encompass potential system compromise and operational disruption across industrial environments. An attacker who gains access to the network segment where these RTUs operate could potentially replace legitimate firmware with malicious code, leading to system instability, operational failures, or even complete system compromise. The absence of authentication mechanisms means that any firmware update, regardless of its source, would be accepted by the system, creating opportunities for persistent backdoors or denial-of-service conditions that could affect critical infrastructure operations. This vulnerability particularly impacts the ATT&CK technique T1547.001, which involves the modification of system boot processes, and T1078.002, which deals with legitimate credentials used for persistence, as the compromised systems could be used to establish persistent access points within industrial networks. The lack of firmware signing creates opportunities for attackers to bypass security controls and maintain long-term presence within operational technology environments.
Mitigation strategies for this vulnerability must address both the immediate security gap and the broader architectural weaknesses in the firmware update process. Organizations should implement network segmentation to limit access to RTU communication channels and deploy network monitoring solutions that can detect anomalous firmware update activities. The most effective immediate solution involves implementing cryptographic signature verification for all firmware updates, ensuring that only authenticated firmware images are accepted by the devices. Additionally, organizations should consider implementing secure boot mechanisms that validate firmware integrity before installation, which would prevent the execution of unauthorized modifications. The remediation process should include updating the BSAP-IP protocol implementation to incorporate proper authentication mechanisms, aligning with NIST SP 800-145 standards for secure firmware management. Regular firmware integrity checks and monitoring of update activities should be established to detect potential compromise attempts, while network access controls should be implemented to restrict firmware update capabilities to authorized personnel only. The vulnerability highlights the critical need for robust security practices in industrial control systems, emphasizing that operational technology environments require the same level of security attention as traditional information technology systems to prevent catastrophic operational failures and security breaches.