CVE-2023-40709 in SNAP PAC S1
Summary
by MITRE • 08/24/2023
An adversary could crash the entire device by sending a large quantity of ICMP requests if the controller has the built-in web server enabled but does not have the built-in web server completely set up and configured for the SNAP PAC S1 Firmware version R10.3b
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Analysis
by VulDB Data Team • 09/20/2023
The vulnerability identified as CVE-2023-40709 represents a critical denial of service condition affecting SNAP PAC S1 devices running firmware version R10.3b. This weakness specifically manifests when the device controller operates with a partially configured built-in web server functionality. The flaw exploits the device's handling of Internet Control Message Protocol requests, creating a scenario where an attacker can systematically overwhelm the system through massive ICMP traffic volumes. The vulnerability's severity stems from its ability to completely crash the device, rendering it inoperable and effectively denying service to legitimate users who depend on the industrial control system for operations.
The technical implementation of this vulnerability resides in the device's insufficient input validation mechanisms within the web server component. When the built-in web server is enabled but not properly configured, the system fails to adequately process or rate-limit incoming ICMP requests. This creates a buffer overflow or resource exhaustion condition where the device cannot properly handle the volume of requests, leading to system instability and eventual complete crash. The issue demonstrates poor defensive programming practices and inadequate error handling within the network protocol stack, particularly in how the system processes unsolicited network traffic. According to CWE classification, this vulnerability aligns with CWE-400: Uncontrolled Resource Consumption and CWE-665: Improper Initialization, as the system fails to properly initialize and manage its network resources.
The operational impact of CVE-2023-40709 extends beyond simple service disruption to potentially compromise entire industrial control processes. In industrial environments where SNAP PAC S1 controllers manage critical infrastructure operations, a device crash can result in production halts, safety system failures, and significant financial losses. The vulnerability's exploitation requires minimal resources from an attacker, making it particularly dangerous as it can be executed remotely without requiring physical access or advanced technical skills. From an ATT&CK framework perspective, this vulnerability maps to T1499.004: Endpoint Denial of Service and T1566.001: Phishing via Social Engineering, as it can be leveraged through network-based attacks that target the device's exposed web server functionality. The affected environment becomes increasingly vulnerable as the web server remains enabled but improperly configured, creating a persistent attack surface that adversaries can exploit repeatedly.
Mitigation strategies for CVE-2023-40709 require immediate attention to properly configure or disable the built-in web server functionality on affected devices. Organizations should implement network segmentation to restrict access to the device's web interface and establish proper firewall rules to limit ICMP traffic. The recommended approach involves either fully configuring the web server with appropriate security controls or disabling the service entirely if not required for operations. Network monitoring should be enhanced to detect unusual ICMP traffic patterns that may indicate exploitation attempts. Additionally, regular firmware updates should be implemented to address the underlying vulnerability, as the issue specifically affects firmware version R10.3b. System administrators should also establish baseline configurations that ensure the web server is properly initialized and secured before deployment in operational environments, preventing the conditions that allow this vulnerability to be exploited.