Severity: HIGH
Description: Malformed S2 Nonce Get command classes can be sent to crash the gateway. A hard reset is required to recover the gateway.
CVSS Score: 7.5
B
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1. Risk Assessment
The vulnerability identified as CVE-2024-3052 is a high-severity issue with a CVSS score of 7.5. It affects the Z/IP Gateway SDK, specifically versions prior to 7.14.00. The vulnerability allows an attacker to send malformed S2 Nonce Get command classes, causing the gateway to crash. A hard reset is required to recover the gateway, leading to a denial of service (DoS) condition. The attack vector is network-based, requiring no user interaction or privileges, making it relatively easy to exploit.
The primary impact is on availability, as the gateway becomes unresponsive until manually reset. There is no impact on confidentiality or integrity, as the vulnerability does not allow data exfiltration or modification. The likelihood of exploitation is moderate, given the low attack complexity and the absence of required privileges. However, the EPSS score of 0.00043 suggests that widespread exploitation is currently unlikely.
From a business perspective, this vulnerability could disrupt operations reliant on the Z/IP Gateway, leading to downtime, operational delays, and potential financial losses. Organizations using affected versions of the SDK should prioritize mitigation to avoid service interruptions.
2. Potential Attack Scenarios
An attacker could exploit this vulnerability by crafting and sending a malformed S2 Nonce Get command class to the target Z/IP Gateway over the network. The attack process would involve identifying the IP address or network location of the gateway, which could be done through network scanning or reconnaissance. Once the target is identified, the attacker sends the malicious payload, causing the gateway to crash.
The potential outcome is a denial of service, rendering the gateway inoperable until a hard reset is performed. This could disrupt critical operations, such as home automation systems, industrial control systems, or IoT networks that rely on the gateway for communication. In a worst-case scenario, repeated attacks could lead to prolonged downtime, affecting business continuity and customer satisfaction.
3. Mitigation Recommendations
The most effective mitigation is to update the Z/IP Gateway SDK to version 7.14.00 or later, as this version addresses the vulnerability. Organizations should immediately check their systems for affected versions and apply the update.
If immediate patching is not feasible, network-level controls can be implemented to restrict access to the gateway. For example, firewalls can be configured to allow only trusted IP addresses to communicate with the gateway. Additionally, monitoring network traffic for unusual patterns or malformed packets can help detect and block potential exploitation attempts.
For further guidance, refer to the official advisory from Silicon Labs: https://community.silabs.com/068Vm0000045w2j.
4. Executive Summary
CVE-2024-3052 is a high-severity vulnerability in the Z/IP Gateway SDK that can cause a denial of service by crashing the gateway. The vulnerability is easy to exploit and requires no user interaction or privileges, making it a significant risk to organizations using affected versions. While there is no impact on data confidentiality or integrity, the disruption of availability could lead to operational downtime and financial losses.
To mitigate this risk, organizations should update to version 7.14.00 or later of the Z/IP Gateway SDK. If patching is not immediately possible, implementing network-level controls and monitoring can reduce the risk of exploitation. Addressing this vulnerability is critical to maintaining business continuity and ensuring the reliability of systems dependent on the Z/IP Gateway. Immediate action is recommended to prevent potential disruptions.