CVE-2018-4126 in macOS
Summary
by MITRE
A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5, iTunes 12.9 for Windows, iCloud for Windows 7.7.
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Analysis
by VulDB Data Team • 04/08/2020
This memory corruption vulnerability represents a critical security flaw that existed in multiple Apple operating systems and applications prior to their respective version updates. The issue stems from inadequate memory management practices that could lead to unpredictable behavior when the affected systems process certain data inputs. The vulnerability was specifically addressed through enhanced memory handling mechanisms that prevent the corruption patterns previously exploited by malicious actors. Apple's security patches for iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5, iTunes 12.9 for Windows, and iCloud for Windows 7.7 implemented comprehensive fixes to resolve this memory handling weakness.
The technical nature of this memory corruption flaw aligns with common software vulnerabilities categorized under CWE-122, which deals with insufficient space for a buffer. The vulnerability likely manifested when applications attempted to allocate or manipulate memory blocks without proper bounds checking or validation mechanisms. This type of memory handling error creates opportunities for attackers to craft malicious inputs that could cause memory corruption, potentially leading to arbitrary code execution or system instability. The flaw affected not only mobile operating systems but also desktop and desktop synchronization applications, indicating a systemic issue in Apple's memory management frameworks across their ecosystem.
The operational impact of this vulnerability extended across multiple platforms and user environments, creating widespread exposure for organizations and individuals using affected versions. Attackers could potentially exploit this memory corruption through various attack vectors including malicious email attachments, compromised websites, or infected software downloads. The vulnerability's presence in iTunes and iCloud for Windows applications meant that even Windows users running these applications were at risk, creating cross-platform attack surface that required comprehensive patching across Apple's entire software portfolio. This type of vulnerability typically falls under the ATT&CK framework's technique T1059 for command and script injection, where memory corruption could enable attackers to execute malicious code.
Mitigation strategies for this vulnerability required immediate deployment of Apple's security updates across all affected platforms and versions. Organizations needed to implement comprehensive patch management processes to ensure all endpoints running the vulnerable software received updates promptly. System administrators should have monitored for successful patch deployment and verified that the memory handling improvements were properly implemented across all affected applications. The fix likely involved implementing stricter memory allocation checks, enhanced buffer overflow protections, and improved memory deallocation procedures that prevent the corruption patterns that previously allowed exploitation. This vulnerability highlighted the importance of regular security updates and proper memory management practices in preventing exploitation of fundamental software flaws that could compromise entire computing ecosystems.