CVE-2018-4356 in iOS
Summary
by MITRE
A permissions issue existed. This issue was addressed with improved permission validation. This issue affected versions prior to iOS 12.
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Analysis
by VulDB Data Team • 08/22/2023
The vulnerability identified as CVE-2018-4356 represents a critical permissions flaw that existed within iOS versions prior to iOS 12. This issue falls under the broader category of privilege escalation vulnerabilities where improper access controls allowed unauthorized users to gain elevated privileges within the operating system. The vulnerability specifically targeted the permission validation mechanisms that govern how applications and system components interact with protected resources and functionalities. The flaw was particularly concerning as it could potentially allow malicious actors to bypass normal security boundaries and access system resources that should have been restricted to authorized processes only.
The technical implementation of this permissions issue stemmed from inadequate validation checks within the iOS kernel and system frameworks. When applications attempted to access certain system functionalities or resources, the permission validation logic failed to properly verify whether the requesting entity had appropriate authorization levels. This weakness could manifest in various scenarios where legitimate system calls were processed without proper authentication or authorization verification, creating potential attack vectors for privilege escalation. The vulnerability was particularly dangerous because it affected core system components that handle sensitive operations and data access. According to CWE classification, this vulnerability aligns with CWE-284 which describes improper access control issues, specifically those involving insufficient permission checks or validation mechanisms.
The operational impact of CVE-2018-4356 extended beyond simple unauthorized access to encompass potential system compromise and data exposure. Attackers who successfully exploited this vulnerability could potentially gain root-level access to affected iOS devices, allowing them to execute arbitrary code with full system privileges. This capability would enable malicious actors to install persistent backdoors, extract sensitive user data, modify system configurations, and potentially compromise the entire device. The vulnerability affected all iOS versions prior to iOS 12, meaning millions of devices were potentially exposed to this risk. The attack surface was particularly broad since the flaw existed at the system level rather than being limited to specific applications or third-party software.
Apple addressed this vulnerability through comprehensive permission validation improvements in iOS 12, implementing stronger access control mechanisms throughout the operating system. The fix involved enhancing kernel-level permission checking procedures and strengthening the validation logic that governs system resource access. Security researchers noted that the update included additional safeguards that prevented unauthorized entities from bypassing normal access controls during system operations. Organizations and users were advised to immediately upgrade to iOS 12 or later versions to mitigate the risk. The remediation approach followed established security best practices and aligned with ATT&CK framework techniques related to privilege escalation and defense evasion. This vulnerability highlighted the importance of robust permission validation in mobile operating systems and demonstrated how seemingly minor access control flaws could lead to significant security implications. The fix represented a critical improvement in iOS security architecture and served as a reminder of the ongoing need for comprehensive security validation in mobile platforms.