CVE-2018-4365 in iOS
Summary
by MITRE
An out-of-bounds read was addressed with improved bounds checking. This issue affected versions prior to iOS 12.1.
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Analysis
by VulDB Data Team • 04/08/2020
The vulnerability identified as CVE-2018-4365 represents a critical out-of-bounds read flaw that existed in Apple's iOS operating system prior to version 12.1. This type of vulnerability falls under the category of memory safety issues that can potentially allow attackers to access memory locations beyond the intended boundaries of allocated buffers. The flaw specifically affected iOS versions before 12.1, indicating that Apple had not yet implemented the necessary safeguards to prevent this particular class of memory access violations.
The technical nature of this vulnerability stems from insufficient bounds checking within the iOS kernel or system frameworks that handle memory operations. When applications or system processes attempt to read data from memory locations that extend beyond the allocated buffer boundaries, the system may access unauthorized memory regions. This can result in information disclosure, system instability, or potentially more severe exploitation outcomes depending on the context in which the vulnerability occurs. The issue is classified as a memory corruption vulnerability that can be leveraged by malicious actors to extract sensitive information or gain unauthorized access to system resources.
The operational impact of CVE-2018-4365 extends beyond simple data exposure, as out-of-bounds read vulnerabilities can serve as stepping stones for more sophisticated attacks. Attackers who successfully exploit this flaw could potentially extract kernel memory contents, which might reveal sensitive information such as cryptographic keys, user credentials, or system configuration details. The vulnerability's presence in iOS versions prior to 12.1 means that users of these older systems were at risk of having their devices compromised through various attack vectors that could exploit this memory access violation. This makes the vulnerability particularly concerning for organizations and individuals who have not updated their iOS devices to the patched versions.
Apple's resolution of this vulnerability through improved bounds checking demonstrates the company's commitment to addressing memory safety issues in their operating system. The fix implemented in iOS 12.1 likely involved strengthening memory access validation mechanisms and ensuring that all buffer operations properly verify array boundaries before accessing memory locations. Organizations should prioritize updating to iOS 12.1 or later versions to mitigate this risk, as the vulnerability represents a potential entry point for attackers seeking to compromise iOS devices. This case study aligns with common patterns observed in mobile security where memory safety vulnerabilities serve as primary attack vectors for advanced persistent threats and privilege escalation attacks. The vulnerability also reflects the ongoing challenges in maintaining secure memory management practices within complex operating system architectures, particularly in mobile environments where resource constraints and security requirements must be balanced effectively.