CVE-2011-3431 in iOS
Summary
by MITRE
The Home screen component in Apple iOS before 5 does not properly support a certain application-switching gesture, which might allow physically proximate attackers to obtain sensitive state information by watching the device s screen.
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Analysis
by VulDB Data Team • 11/24/2021
The vulnerability described in CVE-2011-3431 represents a significant security flaw in Apple iOS versions prior to 5.0, specifically within the Home screen component that governs application-switching gestures. This weakness stems from inadequate implementation of screen state management during the transition between applications, creating a window of opportunity for attackers who are physically present with the target device. The vulnerability is classified under CWE-200, which deals with improper exposure of sensitive information, and demonstrates how seemingly innocuous user interface elements can become attack vectors when not properly secured. The flaw exploits the natural gesture-based switching mechanism that users employ to navigate between applications, creating a scenario where sensitive data displayed on the screen during these transitions remains visible to unauthorized observers.
The technical implementation of this vulnerability occurs when users perform application-switching gestures on iOS devices, particularly those involving the Home screen navigation. During these transitions, the system fails to properly obscure or clear sensitive information from the display, allowing attackers to observe state information that should remain private. This includes but is not limited to application data, user interface elements, and potentially confidential information that may be visible during the brief moments when the screen transitions between applications. The vulnerability is particularly concerning because it requires no special privileges or network access, relying purely on physical proximity and the natural user interaction patterns that are common in mobile environments.
Operationally, this vulnerability creates a serious risk for users in public spaces or shared environments where physical proximity to the device cannot be controlled. Attackers can exploit this weakness to gather sensitive information through simple observation, potentially accessing personal data, application states, or other confidential information that might be displayed during the application-switching process. The impact extends beyond individual privacy concerns to include potential corporate data breaches, as users may be unknowingly exposing sensitive business information through their routine device interactions. This vulnerability aligns with ATT&CK technique T1557 which covers "Adversary-in-the-Middle" attacks, specifically focusing on the interception of information through physical proximity and screen observation techniques.
The mitigation strategies for this vulnerability primarily involve upgrading to iOS version 5.0 or later, where Apple implemented proper screen state management and gesture handling that prevents sensitive information from being exposed during application transitions. Additionally, users should be educated about the risks of using devices in public spaces and the importance of being aware of their surroundings when performing application-switching gestures. Organizations should implement policies requiring regular security updates and educate employees about the importance of maintaining physical security of mobile devices. The vulnerability serves as a reminder of the critical importance of proper state management in mobile operating systems and the need for comprehensive security testing of user interface components that handle sensitive information. Security professionals should consider this vulnerability when assessing mobile device security posture and implementing controls to protect against similar weaknesses in other mobile platforms.