CVE-2018-4380 in iOS
Summary
by MITRE
A lock screen issue allowed access to photos and contacts on a locked device. This issue was addressed by restricting options offered on a locked device. This issue affected versions prior to iOS 12.0.1.
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Analysis
by VulDB Data Team • 08/22/2023
The vulnerability identified as CVE-2018-4380 represents a critical security flaw in Apple's iOS operating system that compromised the fundamental security posture of mobile devices. This issue manifested as a lock screen bypass vulnerability that permitted unauthorized access to sensitive personal data including photos and contact information even when the device appeared to be properly secured. The flaw exploited a design weakness in the device's authentication mechanisms, allowing attackers to circumvent the standard lock screen protections that users relied upon to maintain privacy and data security. The vulnerability was particularly concerning because it undermined the core principle of device security where users expected their personal information to remain protected when the screen was locked.
The technical implementation of this vulnerability stemmed from insufficient restrictions on user interface elements and system functions available during the lock screen state. Specifically, the flaw allowed access to certain applications and data services without proper authentication, effectively creating a backdoor that bypassed the normal security protocols. This issue was classified under CWE-284 which addresses improper access control, specifically focusing on insufficient restrictions on a lock screen interface that should have prevented unauthorized data access. The vulnerability exploited a weakness in the iOS security model where legitimate user interface interactions were not properly validated against authentication requirements, creating an opportunity for unauthorized data extraction.
The operational impact of CVE-2018-4380 was significant for users who relied on their mobile devices for personal and potentially sensitive business information. Attackers could exploit this vulnerability to access private photographs, contact lists, and other personal data without needing to bypass the device's passcode or biometric authentication. This created a substantial risk for individuals whose devices contained confidential information, personal photos, or sensitive communications that could be accessed by unauthorized parties. The vulnerability affected all iOS versions prior to 12.0.1, meaning millions of devices were potentially exposed to this security risk. Organizations using iOS devices for business purposes faced increased exposure to data breaches and privacy violations that could compromise sensitive corporate information and personal employee data.
Apple addressed this vulnerability through a comprehensive update that implemented stricter access controls on the lock screen interface. The fix involved modifying the device's security model to ensure that no unauthorized access to sensitive data or applications could occur while the device remained locked. This update aligned with industry best practices for mobile security and demonstrated the importance of maintaining robust authentication mechanisms even in seemingly simple user interface elements. The remediation effort followed established security principles that emphasize the need for least privilege access controls and proper validation of user interactions, particularly in contexts where sensitive data is involved. The implementation of these security controls helped restore user confidence in the device's ability to maintain data privacy and protected against potential exploitation through social engineering or physical access attacks that could leverage this vulnerability.