CVE-2014-4457 in iOS
Summary
by MITRE
The Sandbox Profiles subsystem in Apple iOS before 8.1.1 does not properly implement the debugserver sandbox, which allows attackers to bypass intended binary-execution restrictions via a crafted application that is run during a time period when debugging is not enabled.
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Analysis
by VulDB Data Team • 02/25/2022
The vulnerability identified as CVE-2014-4457 resides within Apple iOS's Sandbox Profiles subsystem, specifically affecting versions prior to 8.1.1. This flaw represents a critical weakness in the operating system's security architecture that undermines the fundamental principles of application sandboxing and privilege separation. The issue manifests in the improper implementation of debugserver sandbox controls, creating a pathway for malicious actors to circumvent security measures that should prevent unauthorized binary execution. The vulnerability's impact extends beyond simple privilege escalation as it fundamentally compromises the integrity of iOS's security model by allowing attackers to execute code that would normally be restricted.
The technical flaw exploits a timing-based weakness in the debugserver sandbox implementation where the system fails to properly enforce execution restrictions when debugging capabilities are disabled. This creates a temporal window during which malicious applications can bypass sandbox controls through crafted payloads that leverage the debugserver's functionality. The vulnerability specifically targets the interaction between the debugserver process and the sandbox profile enforcement mechanisms, where the system does not adequately validate execution contexts when debugging is not actively enabled. This misimplementation allows for code execution that violates the intended security boundaries established by iOS's sandboxing architecture, effectively creating a backdoor for unauthorized operations.
The operational impact of this vulnerability is significant as it enables attackers to execute arbitrary code with elevated privileges while bypassing the normal security controls that protect iOS devices. An attacker could potentially use this vulnerability to install malicious applications, access sensitive data, or perform other unauthorized operations that would normally be prevented by the sandboxing mechanisms. The vulnerability's exploitation requires the attacker to craft a specific application that can be executed during a period when debugging is not enabled, but once successful, it provides persistent access to the device's resources and capabilities. This weakness particularly affects enterprise environments where iOS devices are used for sensitive operations and where the integrity of the device's security model is paramount.
The vulnerability aligns with CWE-254 and CWE-255 categories, specifically addressing weaknesses in the implementation of security controls and the failure to properly enforce access restrictions. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms, as it allows attackers to bypass security controls and maintain access to compromised devices. The issue also relates to Tactic 3 (Persistence) and Tactic 4 (Privilege Escalation) within the ATT&CK matrix, as successful exploitation enables attackers to maintain long-term access and elevate their privileges beyond normal user limitations. Organizations should implement immediate mitigations including updating to iOS 8.1.1 or later, monitoring for suspicious application installations, and reviewing device access controls to prevent unauthorized execution of potentially malicious code.
This vulnerability demonstrates the critical importance of proper sandbox implementation in mobile operating systems and highlights the risks associated with temporal security controls. The flaw serves as a reminder that even seemingly minor implementation details in security systems can create significant vulnerabilities that undermine the entire security architecture. Regular security assessments and timely patch management are essential to prevent exploitation of such timing-based vulnerabilities, as they often represent the most challenging class of security flaws to detect and remediate effectively. The vulnerability also underscores the need for comprehensive testing of security controls under various operational conditions to ensure that sandboxing mechanisms remain effective across all system states and usage scenarios.