CVE-2022-36385 in CMS8000
Summary
by MITRE • 09/13/2022
A threat actor with momentary access to the device can plug in a USB drive and perform a malicious firmware update, resulting in permanent changes to device functionality. No authentication or controls are in place to prevent a threat actor from maliciously modifying firmware and performing a drive-by attack to load the firmware on any CMS8000 device.
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Analysis
by VulDB Data Team • 09/13/2022
This vulnerability represents a critical security flaw in CMS8000 devices that exposes them to unauthorized firmware modification through physical USB access. The vulnerability stems from the absence of proper authentication mechanisms and access controls during the firmware update process, creating a significant attack surface for threat actors who gain temporary physical access to the device. The flaw allows for a straightforward privilege escalation attack where an attacker can simply plug in a malicious USB drive and execute a firmware update without any verification or authorization checks, fundamentally compromising the device's integrity and security posture.
The technical implementation of this vulnerability aligns with CWE-604, which addresses access control vulnerabilities where applications create or use insecure temporary files, and CWE-310, which covers cryptographic issues related to insufficient or missing authentication. The device architecture fails to implement proper firmware integrity verification mechanisms, including digital signatures or cryptographic checksums that would normally validate the authenticity and integrity of firmware updates. This absence of cryptographic validation creates a persistent backdoor that can be exploited by attackers with physical access, potentially leading to complete device compromise and persistent malware installation that survives system reboots.
From an operational perspective, this vulnerability creates a severe risk for industrial control systems and medical devices that rely on CMS8000 platforms, as it allows for drive-by firmware attacks that can be executed without any specialized tools or extensive technical knowledge. The impact extends beyond simple device compromise to include potential data exfiltration, system disruption, and unauthorized modification of critical device functionalities. Threat actors can leverage this vulnerability to install persistent backdoors, modify device behavior to facilitate further attacks, or create covert channels for command and control communications. The attack vector is particularly concerning because it requires minimal sophistication and can be executed by threat actors with basic physical access to the device.
The security implications of this vulnerability are further amplified by its alignment with several ATT&CK framework techniques including T1059 for command and control, T1547 for persistence mechanisms, and T1070 for indicator removal. Organizations using CMS8000 devices face significant operational risk as this vulnerability can be exploited by both external attackers and insider threats with physical access. The lack of authentication controls means that even authorized personnel with temporary access could potentially exploit this vulnerability if they have USB connectivity available to the device. This creates a dangerous scenario where the device's security model is fundamentally flawed at the firmware update level, undermining all other security controls that may be in place.
Mitigation strategies should focus on implementing hardware-level protections such as USB port disablement or restricted access policies for devices that cannot be physically secured. Organizations should also consider deploying firmware integrity monitoring solutions that can detect unauthorized modifications to device firmware. The implementation of secure boot mechanisms and cryptographic verification of firmware updates would address the root cause of this vulnerability. Additionally, network segmentation and monitoring solutions should be deployed to detect anomalous behavior that might indicate successful exploitation of this vulnerability, including unexpected device reboots or network communications that suggest unauthorized firmware modifications have occurred.