CVE-2015-1107 in iOS
Summary
by MITRE
The Lock Screen component in Apple iOS before 8.3 does not properly implement the erasure feature for incorrect passcode-authentication attempts, which makes it easier for physically proximate attackers to obtain access by making many passcode guesses.
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Analysis
by VulDB Data Team • 05/03/2022
The vulnerability described in CVE-2015-1107 represents a significant security flaw in Apple iOS versions prior to 8.3, specifically within the Lock Screen component's passcode authentication mechanism. This weakness stems from the improper implementation of the device erasure feature that should automatically trigger after a predetermined number of failed authentication attempts. The vulnerability creates a scenario where an attacker with physical proximity to the device can systematically guess passcodes without triggering the protective erasure function that would normally secure the device's data.
From a technical perspective, the flaw lies in the iOS Lock Screen's failure to properly enforce the automatic device erasure mechanism that should activate after multiple incorrect passcode entries. This misimplementation allows attackers to perform brute force passcode guessing attacks without the device self-destructing or erasing its contents. The vulnerability operates at the operating system level, specifically targeting the authentication subsystem that governs how the device responds to failed passcode attempts. The attack vector is particularly dangerous because it requires only physical proximity to the device, eliminating the need for network-based exploitation or advanced social engineering techniques.
The operational impact of this vulnerability is substantial, as it effectively removes a critical security barrier that should protect user data from unauthorized access. An attacker with physical access to an iOS device can make numerous passcode attempts without risking device erasure, potentially leading to complete data compromise including personal information, messages, photos, and application data. This vulnerability particularly affects users who rely on simple passcodes or predictable patterns, as the attack can be conducted rapidly without detection. The risk is amplified in environments where devices may be left unattended or in situations where unauthorized individuals gain physical access to locked devices.
Security professionals should note that this vulnerability aligns with CWE-310, which addresses cryptographic weakness, and demonstrates poor implementation of security controls that should prevent unauthorized access through brute force attacks. The issue also relates to ATT&CK technique T1212, which involves exploitation of software vulnerabilities to bypass security controls. Organizations and individuals should immediately update to iOS 8.3 or later versions to remediate this vulnerability, as the patch addresses the flawed implementation of the automatic erasure feature. Additional mitigations include implementing strong, complex passcodes that are resistant to guessing attacks, utilizing biometric authentication methods where available, and ensuring that devices are not left unattended in insecure locations. The vulnerability serves as a reminder of the critical importance of proper authentication mechanism implementation and the need for robust automatic protection features that safeguard user data against physical access attacks.