CVE-2008-3876 in iPhone
Summary
by MITRE
Apple iPhone 2.0.2, in some configurations, allows physically proximate attackers to bypass intended access restrictions, and obtain sensitive information or make arbitrary use of the device, via an Emergency Call tap and a Home double-tap, followed by a tap of any contact s blue arrow.
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Analysis
by VulDB Data Team • 10/08/2018
This vulnerability exists in Apple iPhone 2.0.2 firmware and represents a significant security flaw that exploits the device's emergency call functionality to bypass intended access controls. The vulnerability is particularly concerning because it requires only physical proximity to the device and can be exploited through a simple sequence of user interactions that are commonly performed on smartphones. The flaw leverages the device's emergency call handling mechanism in a way that allows unauthorized access to sensitive device information and functionality.
The technical implementation of this vulnerability involves a specific interaction pattern that manipulates the device's user interface and access control mechanisms. Attackers can initiate an emergency call by tapping the emergency call button, then perform a double-tap on the home button, and finally tap the blue arrow associated with any contact in the phonebook. This sequence effectively bypasses the normal authentication and access restriction protocols that should prevent unauthorized access to device functions. The vulnerability exploits the device's handling of emergency calls in conjunction with the home button double-tap functionality, creating an unexpected access path that was not properly secured.
From an operational impact perspective, this vulnerability enables attackers to gain unauthorized access to sensitive information stored on the device, including contact details, call logs, and potentially other personal data. The ability to make arbitrary use of the device means that attackers could potentially execute unauthorized actions such as sending messages, making calls, or accessing other device features without proper authentication. This represents a serious breach of the device's security model and could lead to privacy violations, data theft, and unauthorized device control. The vulnerability is particularly dangerous because it can be exploited by anyone physically present with the device, making it a significant concern for personal privacy and security.
The vulnerability can be classified under CWE-284, which addresses improper access control, and aligns with ATT&CK technique T1068, which involves exploiting vulnerabilities in legitimate credentials. The attack vector requires physical proximity, making it a type of local attack that could be exploited in scenarios such as device theft, social engineering, or opportunistic attacks. Security professionals should note that this vulnerability demonstrates the importance of proper access control implementation in mobile operating systems and highlights the need for comprehensive security testing of all user interaction sequences. The vulnerability also underscores the risks associated with emergency call functionality and the potential for legitimate features to be exploited for unauthorized access if proper security controls are not implemented.
Mitigation strategies should focus on implementing proper access controls that prevent unauthorized access through emergency call sequences and ensure that all device interactions follow established security protocols. Users should be advised to keep their devices secure and be aware of the potential risks associated with physical proximity attacks. Device manufacturers should implement comprehensive security testing that covers all user interaction patterns and ensure that emergency functionality does not create unintended access paths. The vulnerability serves as a reminder that even seemingly benign features like emergency calls must be carefully designed with security in mind to prevent exploitation through unexpected interaction sequences.