CVE-2005-3715 in SI-680H Wireless VoIP Phone
Summary
by MITRE
Senao SI-680H Wireless VoIP Phone Firmware 0.03.0839 leaves the VxWorks debugger UDP port 17185 available without authentication, which allows attackers to access the phone OS, obtain sensitive information, and cause a denial of service.
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Analysis
by VulDB Data Team • 03/12/2025
The Senao SI-680H Wireless VoIP Phone firmware version 0.03.0839 contains a critical security flaw that exposes the VxWorks real-time operating system debugger interface through UDP port 17185 without any authentication mechanisms. This vulnerability represents a fundamental failure in the device's security architecture and falls under the category of insecure default configurations as defined by CWE-798. The exposed debugger interface creates an attack surface that allows remote adversaries to establish connections directly to the embedded operating system kernel, bypassing all normal security controls and access restrictions that should normally protect enterprise VoIP infrastructure.
The technical exploitation of this vulnerability enables attackers to perform a wide range of malicious activities against the affected device. Through the unauthenticated access to the VxWorks debugger, threat actors can execute arbitrary code within the phone's operating system environment, potentially gaining root-level privileges and complete control over the device. The debugger interface provides access to low-level system functions including memory manipulation, process control, and direct hardware access capabilities that are typically restricted to authorized system administrators. This exposure allows for sensitive information extraction such as user credentials, configuration parameters, and potentially voice communication data that passes through the device. The vulnerability also enables denial of service attacks by allowing malicious actors to crash system processes, corrupt memory structures, or otherwise disrupt the normal operation of the VoIP phone.
From an operational impact perspective, this vulnerability poses significant risks to enterprise network security and communication infrastructure. The Senao SI-680H devices are typically deployed in business environments where they serve as critical communication endpoints, making them attractive targets for attackers seeking to establish persistent access points within corporate networks. The exposed debugger interface can be leveraged as a foothold for lateral movement attacks, potentially enabling attackers to escalate privileges and access other network resources. According to the MITRE ATT&CK framework, this vulnerability maps to multiple techniques including T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation. The impact extends beyond simple device compromise as the VoIP phone serves as a communication gateway, making it possible for attackers to intercept voice communications, manipulate call routing, or disrupt business continuity operations.
Organizations should implement immediate mitigations to address this vulnerability by disabling the VxWorks debugger interface through firmware updates or network segmentation. The recommended approach involves configuring network access controls to block UDP traffic on port 17185 to prevent unauthorized access to the exposed interface. Additionally, security teams should conduct comprehensive network scans to identify all affected devices and ensure proper patch management procedures are established. The vulnerability highlights the importance of secure device configuration practices and the necessity of implementing defense-in-depth strategies that include network monitoring, access control policies, and regular security assessments. Organizations should also consider implementing network segmentation to isolate VoIP infrastructure from critical business systems and establish proper network access controls to prevent unauthorized access to embedded devices that expose debugging interfaces. This vulnerability demonstrates the critical need for manufacturers to implement proper security-by-design principles and for organizations to maintain awareness of the security implications of embedded devices in their network infrastructure.