CVE-2007-1823 in Voice Mail System
Summary
by MITRE
T-Mobile 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 • 07/24/2024
The vulnerability described in CVE-2007-1823 represents a critical security flaw in T-Mobile voice mail systems that stems from insufficient authentication mechanisms and improper handling of Calling Number Identification (CNID) data. This weakness allows remote attackers to exploit the system by simply spoofing caller ID information, effectively bypassing traditional security controls that rely on caller identification for access validation. The vulnerability specifically affects telephony-based voice mail systems where CNID information is used as a form of authentication or authorization mechanism, creating a dangerous assumption that the caller ID represents a legitimate user or authorized party.
The technical flaw in this vulnerability resides in the system's trust model and lack of proper verification mechanisms for CNID data. When a voice mail system receives a call, it typically uses the CNID information to determine whether to grant access to voice mail services, allow message retrieval, or permit mailbox reconfiguration. In the case of CVE-2007-1823, the system fails to validate the authenticity of the CNID information, allowing attackers to manipulate or forge this data to gain unauthorized access. This type of vulnerability is classified under CWE-287, which deals with improper authentication, and represents a classic example of trusting unverified input data in security-sensitive contexts. The flaw essentially transforms the CNID from a security control into a vulnerability vector, as the system cannot distinguish between legitimate and spoofed caller identification data.
The operational impact of this vulnerability is significant and multifaceted, affecting both the confidentiality and integrity of voice mail communications within T-Mobile's infrastructure. Remote attackers can exploit this weakness to retrieve sensitive voice messages that may contain personal information, business communications, or confidential data. The ability to remove messages creates a risk of data destruction and can be used to cover up malicious activities or disrupt communication services. Furthermore, the capability to reconfigure mailboxes allows attackers to modify system settings, potentially creating backdoors, altering message forwarding rules, or even disabling voice mail services entirely. This vulnerability could be exploited by adversaries to conduct surveillance operations, steal sensitive information, or disrupt communication services, making it particularly dangerous in corporate or government environments where voice mail systems often contain critical communications.
The security implications extend beyond simple unauthorized access, as this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to credential access and privilege escalation. Attackers can leverage this weakness to establish persistent access to voice mail systems, potentially using the compromised accounts to further their objectives within the broader network infrastructure. The vulnerability also demonstrates poor security design principles where system designers assumed that caller identification data could be trusted without verification, a common pattern that has been addressed in modern security frameworks through principle of least privilege and multi-factor authentication requirements. Organizations should implement robust authentication mechanisms that verify caller identity through multiple independent channels rather than relying on potentially spoofable CNID information. Remediation strategies should include implementing proper CNID validation, requiring additional authentication factors, and establishing monitoring systems to detect anomalous access patterns that may indicate spoofing attempts.