CVE-2007-6095 in SIParator
Summary
by MITRE
The SIP component in Ingate Firewall before 4.6.0 and SIParator before 4.6.0, when Remote NAT Traversal is employed, does not properly perform user registration and message distribution, which might allow remote authenticated users to receive messages intended for other users.
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Analysis
by VulDB Data Team • 09/11/2018
The vulnerability described in CVE-2007-6095 affects the Session Initiation Protocol implementation within Ingate Firewall and SIParator software versions prior to 4.6.0. This issue specifically manifests when Remote NAT Traversal mechanisms are utilized, creating a critical security flaw in the system's user registration and message distribution processes. The vulnerability represents a significant authorization and access control weakness that undermines the fundamental security assumptions of SIP-based communication systems.
The technical flaw stems from improper handling of user registration states and message routing within the SIP infrastructure when NAT traversal is active. When remote NAT traversal is enabled, the system fails to adequately validate or isolate user sessions, allowing authenticated users to potentially intercept and receive SIP messages that were originally intended for different users within the same system. This misconfiguration creates a message interception and potential eavesdropping scenario where legitimate user communications can be diverted to unauthorized recipients. The vulnerability operates at the application layer and specifically targets the SIP protocol implementation rather than underlying network protocols, making it particularly insidious as it leverages legitimate authentication mechanisms to bypass normal access controls.
The operational impact of this vulnerability extends beyond simple message interception to potentially enable more sophisticated attacks including session hijacking, communication surveillance, and unauthorized access to user information. Attackers who can authenticate to the system gain the ability to monitor communications between other users, potentially accessing sensitive information or disrupting communication services. This represents a violation of the principle of least privilege and can lead to significant privacy breaches or service disruption in environments where SIP-based communication is critical. The vulnerability affects organizations relying on these specific versions of Ingate Firewall or SIParator, particularly those with multiple users and complex communication requirements where NAT traversal is commonly employed.
Mitigation strategies for CVE-2007-6095 require immediate software updates to versions 4.6.0 or later where the vulnerability has been addressed. Organizations should also implement additional network segmentation measures to limit the scope of potential exploitation and consider disabling Remote NAT Traversal functionality if it is not strictly required for network operations. Security monitoring should be enhanced to detect unusual message routing patterns or unauthorized access attempts within SIP communications. From a compliance perspective, this vulnerability aligns with CWE-284 (Improper Access Control) and may be categorized under ATT&CK technique T1566 (Phishing) if attackers use the ability to intercept communications to gather credentials or sensitive information. The vulnerability demonstrates the importance of proper session management and access control validation in telecommunications infrastructure and highlights the need for thorough security testing of network traversal mechanisms. Organizations should also conduct comprehensive audits of their SIP implementations to identify other potential access control weaknesses that could be exploited in similar ways.