CVE-2012-3739 in iOS
Summary
by MITRE
The Passcode Lock implementation in Apple iOS before 6 allows physically proximate attackers to bypass an intended passcode requirement via vectors involving use of the camera.
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Analysis
by VulDB Data Team • 04/13/2021
The vulnerability described in CVE-2012-3739 represents a critical security flaw in Apple iOS versions prior to version 6, specifically within the passcode lock implementation. This weakness fundamentally undermines the device's primary authentication mechanism, creating a significant bypass opportunity for attackers who are physically present with the target device. The flaw operates through a sophisticated manipulation of the device's user interface and camera functionality, exploiting the trust placed in the passcode protection system.
The technical exploitation of this vulnerability involves attackers leveraging the camera capabilities of iOS devices to capture screenshots or visual information from the lock screen interface. This allows unauthorized individuals to bypass the intended passcode requirement by observing or capturing the visual elements that would normally be obscured by the lock screen. The attack vector specifically targets the gap between the device's physical security measures and its digital authentication protocols, creating a scenario where visual information can be extracted without proper authorization. This vulnerability demonstrates a fundamental flaw in how iOS handled the interaction between camera functionality and lock screen security mechanisms.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data breaches, privacy violations, and compromise of sensitive information stored on mobile devices. Attackers can exploit this weakness to gain access to personal communications, financial data, corporate information, and other sensitive content without proper authentication. The physical proximity requirement means that this vulnerability is particularly concerning in environments where devices might be left unattended or where attackers have brief opportunities to access target devices. This creates a significant risk for enterprise users, government officials, and individuals who store sensitive information on iOS devices.
Security researchers have categorized this vulnerability under CWE-284, which addresses improper access control in software implementations. The flaw represents a classic case of insufficient authorization checks, where the system fails to properly validate user intent before allowing access to protected resources. From an attack perspective, this vulnerability aligns with techniques described in the ATT&CK framework under credential access and privilege escalation categories. The attack chain typically involves initial physical access to the device, followed by camera-based information gathering, and finally the exploitation of the lock screen bypass mechanism.
Organizations and individuals should immediately implement mitigations including upgrading to iOS version 6 or later, which contains the necessary security patches to address this vulnerability. Additional protective measures include enabling additional security features such as automatic lock timeouts, using strong passcode policies, and implementing device management solutions that can enforce security configurations. Network-level protections and monitoring systems should also be deployed to detect potential exploitation attempts. The vulnerability highlights the importance of comprehensive security testing that includes edge cases involving device interaction with camera and visual interface elements, as well as the need for continuous security updates to address emerging threats in mobile environments.