CVE-2016-7577 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.1 is affected. macOS before 10.12.1 is affected. The issue involves the "FaceTime" component, which allows remote attackers to trigger memory corruption and obtain audio data from a call that appeared to have ended.
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Analysis
by VulDB Data Team • 08/16/2020
The vulnerability identified as CVE-2016-7577 represents a critical security flaw in Apple's FaceTime implementation that affected multiple operating systems including iOS versions prior to 10.1 and macOS versions prior to 10.12.1. This vulnerability resides within the FaceTime component of Apple's ecosystem and demonstrates a sophisticated memory corruption issue that enables remote attackers to exploit the system's audio handling mechanisms. The flaw specifically targets the call termination process where the system fails to properly manage memory resources when a FaceTime call concludes, creating an exploitable condition that persists beyond the expected call lifecycle.
The technical nature of this vulnerability stems from improper memory management within the FaceTime application's audio processing subsystem. When a FaceTime call ends, the system should properly release all associated memory resources and terminate audio streams. However, the implementation contains a flaw where memory corruption occurs during the call termination sequence, allowing attackers to manipulate the audio data stream even after the call interface indicates the connection has ended. This memory corruption vulnerability can be classified under CWE-125 as an out-of-bounds read, where the system attempts to access memory locations that have already been freed or are otherwise inaccessible, creating a potential attack surface for remote exploitation.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential data interception and unauthorized audio capture capabilities. Attackers can leverage this flaw to access audio data from calls that appeared to have concluded, effectively bypassing the expected security boundaries of the communication channel. This represents a significant compromise of user privacy and trust in Apple's secure communication protocols, as users would have no indication that their audio conversations were being recorded or accessed after the call termination process. The vulnerability operates at the application layer and can be exploited remotely without requiring physical access to the device, making it particularly dangerous in mobile environments where devices are frequently exposed to untrusted networks.
This vulnerability aligns with several tactics described in the MITRE ATT&CK framework, specifically targeting the privilege escalation and persistence domains through the manipulation of audio processing components. The flaw demonstrates characteristics of a remote code execution vulnerability that could potentially be chained with other exploits to gain broader system access. Organizations and users should consider this vulnerability in the context of enterprise security policies and mobile device management strategies, particularly given the widespread adoption of FaceTime as a primary communication tool across Apple's ecosystem. The vulnerability underscores the importance of timely patch management and the need for continuous security assessment of communication applications that handle sensitive user data.
Mitigation strategies for CVE-2016-7577 require immediate deployment of Apple's security patches and updates for affected iOS and macOS versions. Users should ensure their systems are updated to iOS 10.1 or later and macOS 10.12.1 or later, which contain the necessary fixes for the memory corruption issue. Network administrators should monitor for any unauthorized access attempts or unusual audio data patterns that might indicate exploitation attempts. Additionally, organizations should consider implementing network segmentation and monitoring solutions to detect potential exploitation attempts, particularly in environments where FaceTime is used for sensitive communications. The vulnerability highlights the necessity of comprehensive security testing for communication applications and the importance of proper memory management practices in preventing such remote exploitation scenarios.