CVE-2018-4412 in macOS
Summary
by MITRE
A memory corruption issue was addressed with improved input validation. 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
The vulnerability identified as CVE-2018-4412 represents a memory corruption flaw that existed in multiple Apple operating systems and applications prior to their respective security updates. This issue stems from inadequate input validation mechanisms that failed to properly sanitize or verify user-supplied data before processing. The vulnerability affects a broad range of Apple products including iOS versions before 12, macOS Mojave 10.14, tvOS 12, watchOS 5, as well as specific versions of iTunes for Windows and iCloud for Windows. The memory corruption aspect of this vulnerability places it within the purview of CWE-121, which deals with stack-based buffer overflow conditions, and CWE-122, which addresses heap-based buffer overflow scenarios. These classifications indicate that the flaw could potentially allow attackers to manipulate memory layout and execution flow through malformed inputs.
The technical implementation of this vulnerability likely involves improper bounds checking or memory allocation routines that do not adequately validate the size or content of input data before processing. When applications receive untrusted input without proper sanitization, they may attempt to write beyond allocated memory boundaries or overwrite critical memory structures. This type of memory corruption can lead to unpredictable application behavior, system crashes, or potentially more severe consequences such as arbitrary code execution. The flaw's impact is amplified by the widespread use of affected Apple products across mobile, desktop, and embedded platforms, creating numerous potential attack vectors for threat actors. The vulnerability's presence in both client-side applications like iTunes and iCloud for Windows, as well as operating system components, suggests a fundamental flaw in input handling that affects multiple layers of the software stack.
The operational impact of CVE-2018-4412 extends beyond simple system instability to potentially enable sophisticated attack scenarios. Attackers could leverage this memory corruption to execute malicious code with the privileges of the affected application, potentially leading to full system compromise. The vulnerability's presence in widely deployed software means that successful exploitation could affect millions of users across different platforms. From an adversarial perspective, this flaw aligns with ATT&CK technique T1059, which involves executing code through command and scripting interpreters, and potentially T1068, which targets local privilege escalation. The memory corruption nature also relates to ATT&CK technique T1070, which involves clearing logs, as exploitation may generate evidence that needs to be covered. Organizations using affected Apple software versions face significant risk exposure, particularly in enterprise environments where these systems may be targeted by advanced persistent threat actors. The vulnerability's remediation requires comprehensive patching across all affected platforms, making it a critical priority for security operations teams.
Mitigation strategies for CVE-2018-4412 primarily involve immediate deployment of security updates from Apple, which address the underlying input validation deficiencies through improved bounds checking and memory management routines. System administrators should prioritize updating all affected iOS devices, macOS systems, tvOS set-top boxes, and watchOS devices to their respective secure versions. Additionally, network monitoring solutions should be configured to detect potential exploitation attempts through unusual traffic patterns or malformed data transmissions. Organizations should implement application whitelisting policies to restrict execution of unauthorized code and maintain regular vulnerability assessments to identify similar input validation flaws in their software ecosystems. The remediation process should include comprehensive testing of updated systems to ensure that patches do not introduce compatibility issues with existing applications or workflows. Security teams should also consider implementing behavioral monitoring solutions that can detect anomalous memory access patterns indicative of memory corruption exploitation attempts, particularly in environments where legacy systems may not be immediately upgradeable.