CVE-2024-33897 in Cosy+
Summary
by MITRE • 08/06/2024
A compromised HMS Networks Cosy+ device could be used to request a Certificate Signing Request from Talk2m for another device, resulting in an availability issue. The issue was patched on the Talk2m production server on April 18, 2024.
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Analysis
by VulDB Data Team • 08/19/2024
The vulnerability identified as CVE-2024-33897 represents a significant security flaw within the Talk2m platform that affects HMS Networks Cosy+ devices. This issue stems from improper certificate management procedures that allow malicious actors to exploit the certificate signing request mechanism. The vulnerability specifically targets the communication protocol between HMS Networks devices and the Talk2m infrastructure, creating a pathway for unauthorized certificate issuance that could compromise the integrity of the entire device ecosystem. The flaw manifests when a compromised device attempts to initiate certificate signing requests for other devices within the network, effectively disrupting normal operational procedures and creating potential availability issues for legitimate users.
From a technical perspective, this vulnerability falls under the category of improper certificate handling and authorization flaws, aligning with CWE-295 which addresses certificate validation issues and CWE-306 which covers missing security checks. The root cause lies in the lack of proper device authentication and authorization mechanisms within the Talk2m server infrastructure. When a compromised Cosy+ device makes a request to the Talk2m production server, the system fails to properly validate that the requesting device has legitimate authorization to act on behalf of another device. This creates a scenario where an attacker can potentially exhaust certificate issuance resources or manipulate the certificate authority process, leading to service disruption and potential credential compromise.
The operational impact of this vulnerability extends beyond simple availability issues, creating a broader risk landscape for industrial control systems and IoT deployments that rely on Talk2m for device management and security. Organizations using HMS Networks Cosy+ devices in critical infrastructure environments face potential risks including unauthorized device access, certificate fraud, and disruption of communication channels between devices and management systems. The vulnerability particularly affects environments where device certificates are used for mutual authentication and secure communication, as the compromised certificate issuance process could enable attackers to impersonate legitimate devices within the network. This type of attack vector aligns with ATT&CK technique T1078 which covers valid accounts and T1566 which covers credential harvesting through social engineering or system exploitation.
The patch implemented by Talk2m on April 18, 2024, addresses the core issue by strengthening the certificate signing request validation process. This remediation likely involves implementing stricter device authentication mechanisms, adding additional authorization checks before certificate issuance, and potentially introducing rate limiting or monitoring for suspicious certificate request patterns. Organizations should ensure their HMS Networks Cosy+ devices are updated to the latest firmware versions that include this patch, as the vulnerability could be exploited by threat actors targeting industrial control systems. The fix demonstrates the importance of proper certificate management protocols and highlights the need for continuous security monitoring of device management platforms that serve critical infrastructure deployments. Security teams should conduct thorough assessments of their device management systems to identify similar vulnerabilities in other certificate-based authentication mechanisms and ensure proper access controls are in place to prevent unauthorized certificate issuance requests.