CVE-2007-5851 in Mac OS X
Summary
by MITRE
iChat in Apple Mac OS X 10.4.11 allows network-adjacent remote attackers to automatically initiate a video connection to another user via unknown vectors.
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Analysis
by VulDB Data Team • 08/02/2019
The vulnerability described in CVE-2007-5851 represents a significant security flaw in Apple Mac OS X 10.4.11's iChat instant messaging application that enables remote attackers within the same network segment to initiate video connections without user consent. This issue falls under the category of unauthorized access and privilege escalation vulnerabilities, specifically targeting the communication protocols used by iChat for establishing multimedia sessions. The vulnerability exists in the video conferencing functionality of the application and demonstrates a critical failure in access control mechanisms that should prevent unauthorized initiation of multimedia sessions.
The technical implementation of this flaw appears to stem from insufficient validation of incoming connection requests within the iChat application's network stack. Attackers can exploit this vulnerability by crafting specially formatted network packets that bypass normal user authentication and authorization procedures required for initiating video sessions. This allows them to automatically establish video connections with other users on the same network segment, potentially leading to privacy violations and unauthorized surveillance activities. The vulnerability is classified as a network-based attack vector since it requires only network adjacency rather than direct system compromise, making it particularly dangerous in shared network environments such as offices, educational institutions, or public Wi-Fi networks.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential security breaches and user trust violations. When attackers can automatically initiate video connections, they gain the ability to observe other users without their knowledge or consent, which constitutes a serious violation of personal privacy and potentially violates various privacy regulations. This vulnerability also represents a significant risk in enterprise environments where sensitive communications may occur over shared networks, as unauthorized parties could gain access to video streams containing confidential information. The attack vector requires minimal technical expertise to exploit, making it particularly dangerous as it can be leveraged by adversaries with basic networking knowledge to conduct surveillance activities.
Organizations and individual users should implement immediate mitigations including network segmentation to isolate critical systems from general network access, disabling unnecessary video conferencing features when not required, and ensuring that all systems receive timely security updates from Apple. The vulnerability aligns with CWE-284, which describes improper access control mechanisms, and demonstrates characteristics consistent with ATT&CK technique T1046 for network service scanning and T1071 for application layer protocols. Regular network monitoring should be implemented to detect unusual video connection patterns, and users should be educated about the risks of accepting unsolicited video connection requests. Additionally, firewall rules should be configured to restrict unnecessary traffic to and from iChat application ports, and system administrators should consider implementing network access control lists to prevent unauthorized access to multimedia services within the network infrastructure.