CVE-2012-0645 in iOS
Summary
by MITRE
Siri in Apple iOS before 5.1 does not properly restrict the ability of Mail.app to handle voice commands, which allows physically proximate attackers to bypass the locked state via a command that forwards an active e-mail message to an arbitrary recipient.
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Analysis
by VulDB Data Team • 03/21/2021
The vulnerability described in CVE-2012-0645 represents a significant security flaw in Apple iOS versions prior to 5.1 that specifically affects the integration between Siri voice recognition and the Mail application. This issue stems from inadequate access controls within the iOS operating system that govern how voice commands can interact with email functionality while the device is locked. The flaw exploits a fundamental weakness in the security model that should prevent unauthorized actions when a device is in a locked state, creating a pathway for malicious actors to bypass device security measures through seemingly benign voice commands.
The technical implementation of this vulnerability occurs through the improper handling of voice command execution within the Mail application context. When a device is locked, normal user interactions should be restricted to prevent unauthorized access to sensitive functions. However, the flaw allows Mail.app to process voice commands that would normally be blocked or restricted, enabling attackers to execute commands such as forwarding active email messages to arbitrary recipients. This occurs because the system fails to properly validate the security context in which voice commands are processed, allowing commands to be executed even when the device is secured.
The operational impact of this vulnerability extends beyond simple privacy concerns to potentially enable more serious security breaches. An attacker with physical proximity to a locked iOS device can exploit this flaw to access and forward sensitive email communications without proper authentication. This creates a vector for data exfiltration and potential social engineering attacks, as the forwarded emails may contain confidential information that could be used for identity theft, corporate espionage, or other malicious activities. The vulnerability essentially transforms the locked state of the device from a security barrier into a potential attack surface.
From a cybersecurity perspective, this vulnerability aligns with CWE-284, which addresses improper access control, and represents a clear violation of the principle of least privilege. The issue also maps to several ATT&CK techniques including T1546.004 for hijacking and T1059.008 for voice command execution, demonstrating how the flaw enables adversaries to perform unauthorized actions through legitimate system interfaces. The vulnerability's exploitation requires only physical proximity and basic knowledge of the device's voice command functionality, making it particularly concerning from a threat modeling standpoint.
Mitigation strategies for this vulnerability should focus on implementing proper access controls and ensuring that voice command processing respects the security context of the device state. Apple's subsequent patch for iOS 5.1 addressed this issue by strengthening the validation mechanisms that govern when and how voice commands can be processed within restricted contexts. Organizations should ensure that all iOS devices are updated to the latest available versions and consider implementing additional security measures such as device encryption, remote wipe capabilities, and user education about the risks of physical proximity attacks. The vulnerability serves as a reminder of the importance of securing all user interface pathways, including voice-based interactions, when designing security controls for mobile platforms.