CVE-2014-4451 in iOS
Summary
by MITRE
Apple iOS before 8.1.1 does not properly enforce the failed-passcode limit, which makes it easier for physically proximate attackers to bypass the lock-screen protection mechanism via a series of guesses.
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Analysis
by VulDB Data Team • 02/25/2022
The vulnerability described in CVE-2014-4451 represents a critical weakness in Apple iOS security architecture that fundamentally undermines the device's lock-screen protection mechanisms. This flaw affects iOS versions prior to 8.1.1 and specifically targets the passcode enforcement system that is designed to prevent unauthorized access through brute force attacks. The vulnerability exploits a fundamental design flaw in how the operating system handles failed passcode attempts, creating a window of opportunity for attackers who have physical proximity to the device.
The technical implementation of this vulnerability stems from Apple's failure to properly enforce the passcode lockout mechanism that should trigger after a predetermined number of failed attempts. In a properly functioning system, after a certain number of incorrect passcode entries, the device should either lock for an increasingly longer period or require a restart to attempt further guesses. However, iOS versions before 8.1.1 allowed attackers to bypass these protections through systematic guessing attempts, effectively rendering the lock-screen security measures ineffective against determined physical attackers who can repeatedly attempt passcode combinations without proper enforcement.
The operational impact of this vulnerability is significant for users who rely on their iOS devices for sensitive data storage and communication. Attackers with physical proximity to a locked device can exploit this weakness to gain unauthorized access through automated or manual passcode guessing, potentially accessing personal information, financial data, communications, and business-critical applications. The vulnerability particularly affects users in environments where devices may be left unattended or where physical access cannot be guaranteed, such as in public spaces, shared work environments, or during travel. The ease with which this bypass can be achieved makes it a particularly concerning security flaw that undermines the fundamental security model of mobile devices.
This vulnerability aligns with CWE-305 authentication weakness patterns, specifically addressing improper enforcement of authentication mechanisms that should prevent brute force attacks through failed credential attempts. From an ATT&CK framework perspective, this issue maps to techniques involving credential access and privilege escalation, as it allows attackers to bypass the initial authentication barrier that should protect device access. The vulnerability also relates to the broader category of mobile device security flaws that compromise the integrity of user access controls, making it a critical concern for enterprise security policies and mobile device management strategies. Organizations implementing mobile device security measures must consider this vulnerability when assessing risk and developing security controls for iOS environments.
The remediation for this vulnerability required Apple to implement proper enforcement of the passcode lockout mechanism in iOS 8.1.1, ensuring that failed passcode attempts trigger appropriate delays and lockout periods that prevent systematic guessing attacks. Users should immediately update to iOS 8.1.1 or later versions to address this vulnerability. Security professionals should also consider implementing additional protective measures such as remote wipe capabilities, encryption enforcement, and regular security assessments to mitigate the risk associated with older iOS versions that may still be in use within organizational environments.