CVE-2005-2182 in BudgeTone
Summary
by MITRE
Grandstream BudgeTone (BT) 100 Voice over IP (VoIP) phones do not properly check the Call-ID, branch, and tag values in a NOTIFY message to verify a subscription, which allows remote attackers to spoof messages such as the "Messages waiting" message.
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Analysis
by VulDB Data Team • 07/10/2018
The vulnerability identified in CVE-2005-2182 affects Grandstream BudgeTone BT 100 VoIP phones, representing a significant security flaw in session initiation protocol handling within voice over IP communications. This issue stems from inadequate validation mechanisms within the phone's implementation of the SIP protocol, specifically in how it processes NOTIFY messages that are used to convey subscription status updates. The vulnerability resides in the phone's failure to properly authenticate and verify critical elements of the SIP message structure, including the Call-ID, branch, and tag values that are essential for maintaining the integrity of subscription sessions.
The technical flaw manifests when the Grandstream BT 100 phone receives a NOTIFY message without performing adequate verification of the message's authenticity indicators. These elements serve as critical security tokens that ensure the message originates from a legitimate source and maintains continuity within an established subscription. The absence of proper validation allows malicious actors to craft and inject spoofed NOTIFY messages that appear to come from authorized sources within the network. This particular weakness enables attackers to manipulate the phone's display and functionality by injecting false "Messages waiting" notifications, effectively bypassing the phone's built-in security mechanisms designed to prevent unauthorized message injection.
The operational impact of this vulnerability extends beyond simple message spoofing to potentially compromise the integrity of voice communication services within an organization. Attackers could exploit this weakness to disrupt normal communication flows, create false alarms for users, or even gain unauthorized access to certain phone functionalities. The vulnerability particularly affects environments where VoIP systems are deployed without additional network-level security controls, as the attack can be executed remotely without requiring physical access to the device. This makes the vulnerability particularly dangerous in enterprise settings where phone systems serve as critical communication infrastructure and where unauthorized access could lead to broader network compromise.
The security implications of this vulnerability align with CWE-284, which addresses improper access control mechanisms, and can be mapped to ATT&CK technique T1566 for social engineering attacks that leverage spoofed communications. Organizations utilizing these devices face risks of man-in-the-middle attacks where legitimate users receive false notifications that could mislead them about their communication status. The vulnerability demonstrates the critical importance of proper message authentication in SIP implementations and highlights the need for comprehensive security testing of VoIP devices. Effective mitigation strategies should include network segmentation to limit access to VoIP infrastructure, implementation of secure SIP signaling protocols, and regular firmware updates to address known vulnerabilities. Additionally, organizations should consider deploying network-based intrusion detection systems specifically designed to monitor and alert on suspicious SIP traffic patterns that could indicate exploitation attempts.