CVE-2003-20001 in ICP VoIP 3100
Summary
by MITRE • 04/02/2025
An issue was discovered on Mitel ICP VoIP 3100 devices. When a remote user attempts to log in via TELNET during the login wait time and an external call comes in, the system incorrectly divulges information about the call and any SMDR records generated by the system. The information provided includes the service type, extension number and other parameters, related to the call activity.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/02/2025
This vulnerability exists in Mitel ICP VoIP 3100 devices where improper handling of concurrent network connections during authentication creates a significant information disclosure risk. The flaw occurs specifically when a remote user attempts to establish a telnet session while the system is in a login wait state and an external call is simultaneously incoming. The device fails to properly isolate authentication contexts from active call processing functions, resulting in unauthorized information leakage. This represents a critical weakness in the device's security architecture where the separation of authentication and operational call handling processes is insufficient.
The technical implementation of this vulnerability stems from inadequate state management within the device's network protocol handling. When telnet authentication is in progress and a call arrives, the system's call processing subsystem continues to operate with full privileges, allowing the authentication interface to expose call-related data structures. This behavior violates fundamental security principles of information hiding and access control. The vulnerability manifests through the system's inability to properly context-switch between authentication and operational modes, creating a race condition where call metadata becomes accessible through the telnet session. This aligns with CWE-200, which addresses improper information disclosure, and demonstrates poor separation of privileges as outlined in CWE-276.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable sophisticated attack vectors. An attacker could exploit this weakness to gather detailed information about the VoIP system's operational state including service types, extension numbers, and potentially sensitive call routing information. This intelligence gathering capability could facilitate further attacks such as social engineering, targeted phishing campaigns, or more advanced exploitation attempts. The exposure of SMDR (Station Message Detail Records) data particularly undermines the device's ability to maintain call privacy and audit trail integrity. This vulnerability directly impacts the confidentiality and integrity aspects of the CIA triad as defined by NIST SP 800-53, potentially allowing attackers to map the internal network structure and identify high-value targets within the VoIP infrastructure.
Mitigation strategies should focus on implementing proper session isolation mechanisms and strengthening the device's authentication state management. Network segmentation through firewalls should restrict direct telnet access to administrative interfaces, while implementing secure shell (SSH) alternatives for remote management. Regular firmware updates from Mitel should be applied to address the underlying architectural flaw. Access controls should be tightened to ensure only authorized personnel can establish telnet sessions during active call processing periods. The system should be configured to immediately terminate authentication sessions when incoming calls are detected, preventing the context switch that enables information leakage. Additionally, network monitoring should be implemented to detect unusual patterns of telnet connections during peak call activity periods, as outlined in MITRE ATT&CK framework's T1071.004 for application layer protocol usage and T1566 for credential access through network services.