Full Report
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) released a fact sheet analyzing three firmware versions of the... The post CISA warns of backdoor vulnerabilities in Contec CMS8000 patient monitors, IP linked to China appeared first on Industrial Cyber.
Analysis Summary
# Vulnerability: Contec CMS8000 Patient Monitor Hidden Backdoor Functionality
## CVE Details
- CVE ID: Not explicitly assigned in the provided text. (Note: The text discusses CISA analysis, but a specific public CVE ID for this backdoor is missing.)
- CVSS Score: Not specified, but described as posing a serious risk to patient safety and data integrity.
- CWE: CWE-912: Hidden Functionality, CWE-359: Exposure of Private Personal Information to an Unauthorized Actor
## Affected Systems
- Products: Contec CMS8000 Patient Monitors, Epsimed MN-120 Patient Monitors (rebranded versions of CMS8000).
- Versions: Firmware Version 2.0.6, a pre-release image with no known version number, and a pre-release image of Version 2.0.8 were analyzed. The flaw exists in *all versions analyzed*.
- Configurations: Any configuration connected to a network or the internet.
## Vulnerability Description
The Contec CMS8000 (and rebranded Epsimed MN-120) devices contain a hard-coded reverse backdoor function within the firmware, present in all analyzed versions. This backdoor initiates automated connectivity during the startup routine over port 515 to an unidentified third-party IP address (associated with a university, not a manufacturer). This functionality allows the device to download and execute unverified remote files, potentially leading to Remote Code Execution (RCE) and overwriting existing system files upon reboot without proper integrity checking or version tracking. The flaw is explicitly linked to unauthorized data exfiltration of PII and PHI.
## Exploitation
- Status: Potential for exploitation exists; described as a "backdoor" leading to device compromise.
- Complexity: Not explicitly stated, but characteristics suggest pre-provisioned access.
- Attack Vector: Network (due to external communication initiated by the device).
## Impact
- Confidentiality: High (Allows exfiltration of PII and PHI).
- Integrity: High (Allows unauthorized modification of device files and potential RCE, leading to device malfunction).
- Availability: Medium/High (Compromised device may malfunction or cease intended operation).
## Remediation
### Patches
- **None available** at the time of FDA warning.
### Workarounds
1. **Disconnection:** Unplug affected monitors from the network where possible.
2. **Disable Remote Features:** If relying only on local monitoring, unplug the Ethernet cable.
3. **Disable Wireless:** Disable all wireless capabilities (WiFi or cellular) if the device supports it. If wireless cannot be disabled, continued use poses risk.
4. **Monitoring:** Closely monitor devices for signs of unusual functioning, such as inconsistencies between displayed vital signs and the patient’s actual physical state.
## Detection
- **Indicators of Compromise (IoCs):** Anomalous outbound network traffic originating from the CMS8000 on port 515 during startup. Inconsistent or unexpected behavior of the patient monitor.
- **Detection Methods and Tools:** Network monitoring tools capable of inspecting traffic flows on port 515. Asset inventory tools to identify affected device models.
## References
- CISA Advisory: hxxps://www.cisa.gov/resources-tools/resources/contec-cms8000-contains-backdoor
- FDA Safety Communication: hxxps://www.fda.gov/medical-devices/safety-communications/cybersecurity-vulnerabilities-certain-patient-monitors-contec-and-epsimed-fda-safety-communication
- Armis Analysis: hxxps://www.armis.com/blog/patient-monitor-vulnerabilities-threaten-healthcare-security-cisa-warns/