CVE-2018-4431 in macOS
Summary
by MITRE
A memory initialization issue was addressed with improved memory handling. This issue affected versions prior to iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, watchOS 5.1.2.
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Analysis
by VulDB Data Team • 04/18/2020
The vulnerability identified as CVE-2018-4431 represents a memory initialization flaw that was subsequently addressed through enhanced memory handling mechanisms in Apple's operating systems. This issue specifically impacted devices running versions prior to iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, and watchOS 5.1.2, indicating a widespread concern affecting multiple Apple product lines. The vulnerability falls under the category of memory safety issues that can potentially lead to system instability or unauthorized access to system resources.
The technical nature of this memory initialization problem suggests that during the boot process or when handling specific memory allocation operations, the system failed to properly initialize memory segments before they were accessed. This type of vulnerability typically occurs when memory regions are allocated but not properly cleared or initialized, leaving sensitive data or system state information accessible to unauthorized processes or attackers. Such issues often manifest as information disclosure vulnerabilities where residual data from previous operations can be read from uninitialized memory locations. The CWE (Common Weakness Enumeration) classification for this type of issue would likely fall under CWE-1276, which covers improper initialization of memory or resources, or potentially CWE-457, which addresses use of uninitialized variables.
The operational impact of CVE-2018-4431 extends beyond simple system instability, as uninitialized memory can potentially contain sensitive information from previous processes or system operations. Attackers could potentially exploit this vulnerability to gain insights into system state, memory layout, or even extract credentials, encryption keys, or other sensitive data that may have been present in the uninitialized memory regions. This vulnerability particularly affects mobile and embedded systems where memory management is critical and resources are limited. The attack surface is significant given that it affected multiple Apple platforms including mobile devices, desktop computers, and television systems, making it a prime target for sophisticated attackers seeking to compromise diverse device ecosystems.
Mitigation strategies for this vulnerability primarily involve updating affected systems to the patched versions mentioned in the advisory. System administrators should prioritize deployment of iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, and watchOS 5.1.2 updates across all affected devices. Additionally, organizations should implement comprehensive patch management processes to ensure timely deployment of security updates. The ATT&CK framework would classify this vulnerability under techniques related to privilege escalation and information gathering, as attackers could potentially leverage uninitialized memory access to extract sensitive information. Network monitoring should be enhanced to detect potential exploitation attempts, and system integrity checking mechanisms should be strengthened to prevent unauthorized modifications to memory management components. Organizations should also consider implementing additional security controls such as memory protection mechanisms, address space layout randomization, and other exploit mitigation techniques to reduce the overall risk exposure from similar memory-related vulnerabilities.