Contec Health CMS8000 Patient Monitor Boot update backdoor

Summaryinfo

A vulnerability labeled as critical has been found in Contec Health CMS8000 Patient Monitor. Affected by this vulnerability is an unknown functionality of the file update of the component Boot Handler. Executing a manipulation can lead to backdoor. The identification of this vulnerability is CVE-2025-1204. The physical device can be targeted for the attack. There is no exploit available.

Detailsinfo

A vulnerability has been found in Contec Health CMS8000 Patient Monitor (the affected version unknown) and classified as critical. This vulnerability affects an unknown part of the file update of the component Boot Handler. The manipulation with an unknown input leads to a backdoor vulnerability. The CWE definition for the vulnerability is CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The "update" binary in the firmware of the affected product sends attempts to mount to a hard-coded, routable IP address, bypassing existing device network settings to do so. The function triggers if the 'C' button is pressed at a specific time during the boot process. If an attacker is able to control or impersonate this IP address, they could upload and overwrite files on the device.

The weakness was shared with Claroty. The advisory is shared for download at claroty.com. This vulnerability was named CVE-2025-1204 since 02/10/2025. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1588.001.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Medical Device Software

Vendor

• Contec Health

Name

• CMS8000 Patient Monitor

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