CVE-2007-1821 in Voice Mail System
Summary
by MITRE
Sprint Nextel Sprint voice mail systems allow remote attackers to retrieve or remove messages, or reconfigure mailboxes, by spoofing Calling Number Identification (CNID, aka Caller ID).
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Analysis
by VulDB Data Team • 07/23/2024
The vulnerability identified as CVE-2007-1821 affects Sprint Nextel voice mail systems and represents a significant security flaw in telecommunications infrastructure that enables remote attackers to manipulate voice mail services through spoofing techniques. This issue specifically targets the Calling Number Identification (CNID) mechanism, which is a fundamental component of telephone systems designed to display caller information to recipients. The vulnerability exists within the authentication and authorization processes of the voice mail system, where the system relies on the caller ID information provided by the originating telephone network without sufficient verification mechanisms to validate the authenticity of the calling number.
The technical flaw stems from the voice mail system's failure to properly authenticate incoming calls based on the CNID information provided by the telephone network. When attackers spoof a calling number, the voice mail system accepts the false caller identification as legitimate and grants access to voice mail functions based on the spoofed number. This represents a classic case of insufficient input validation and authentication weakness that aligns with CWE-287, which addresses improper authentication vulnerabilities in software systems. The vulnerability essentially allows unauthorized access to voice mail services through manipulation of the telephone network's caller identification protocol.
The operational impact of this vulnerability is substantial as it enables attackers to perform multiple malicious activities including retrieving confidential voice messages, deleting important communications, and reconfiguring mailbox settings without proper authorization. This compromise affects the confidentiality, integrity, and availability of voice mail services, potentially exposing sensitive personal or business communications to unauthorized parties. The remote nature of the attack means that threat actors can exploit this vulnerability from anywhere in the world without requiring physical access to the system or network infrastructure. Attackers can target specific users or organizations by spoofing their telephone numbers, making this a particularly dangerous vulnerability for businesses and individuals who rely on voice mail systems for sensitive communications.
The security implications extend beyond simple unauthorized access to encompass potential data breaches and privacy violations that could have serious legal and regulatory consequences. Organizations using these voice mail systems may face compliance violations under various data protection regulations that require adequate security controls to protect sensitive information. The vulnerability also demonstrates weaknesses in legacy telecommunications infrastructure that may not have been designed with modern security requirements in mind, highlighting the importance of security considerations in network protocol implementations.
Effective mitigation strategies should focus on implementing proper authentication mechanisms that verify the authenticity of calling numbers beyond simple caller ID information. Organizations should consider implementing additional security layers such as secure authentication protocols, network-based access controls, and monitoring systems that can detect anomalous calling patterns or unauthorized access attempts. The implementation of secure calling number verification mechanisms and regular security assessments of telecommunications infrastructure aligns with recommended practices in cybersecurity frameworks and can help prevent similar vulnerabilities from being exploited in the future. This vulnerability serves as a reminder of the importance of considering security throughout the entire lifecycle of telecommunications systems and the need for robust authentication mechanisms in networked environments.